Physics of the Underlying Event Rick Field University of Florida - - PowerPoint PPT Presentation

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 1

Proton Proton

PT(hard)

UE&MB@CMS UE&MB@CMS Outline

Examine the connection between the “underlying event” in a hard

scattering process (UE) and “min-bias” collisions (MB).

ATLAS

How well can we predict “min-bias” collisions at the LHC? Strange particle and baryon production at the LHC. How well did we do at predicting the behavior of the “underlying

event” at the LHC (900 GeV and 7 TeV)?

CMS

How universal are the QCD Monte-Carlo model tunes?

Proton Proton

“Minimum Bias” Collisions

K+

u s

K-

u s

Kshort

d s s d +

p

u u d

Λ Λ Λ Λ

u d s

Ξ Ξ Ξ Ξ−

− − −

d s s

Rick Field University of Florida

Physics of the Underlying Event

High Energy QCD after the start of the LHC

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 2

QCD Monte QCD Monte-

• Carlo Models:

Carlo Models: High Transverse Momentum Jets High Transverse Momentum Jets

Start with the perturbative 2-to-2 (or sometimes 2-to-3) parton-parton scattering and add initial and final- state gluon radiation (in the leading log approximation or modified leading log approximation).

Hard Scattering

PT(hard)

Hard Scattering

PT(hard)

Outgoing Parton Outgoing Parton Initial-State Radiation Final-State Radiation

Proton AntiProton

Underlying Event Underlying Event Proton AntiProton

“Hard Scattering” Component

“Jet” “Jet”

“Underlying Event”

The “underlying event” consists of the “beam-beam remnants” and from particles arising from soft or semi-soft multiple parton interactions (MPI). Of course the outgoing colored partons fragment into hadron “jet” and inevitably “underlying event”

• bservables receive contributions from initial and final-state radiation.

“Jet”

The “underlying event” is an unavoidable background to most collider observables and having good understand of it leads to more precise collider measurements!

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 3

QCD Monte QCD Monte-

• Carlo Models:

Carlo Models: Lepton Lepton-

• Pair Production

Pair Production

• Start with the perturbative Drell-Yan muon pair production and add initial-state gluon radiation (in the

leading log approximation or modified leading log approximation).

Proton AntiProton

Underlying Event Underlying Event Proton AntiProton

Lepton-Pair Production

Lepton Anti-Lepton Initial-State Radiation

Lepton-Pair Production

“Underlying Event”

The “underlying event” consists of the “beam-beam remnants” and from particles arising from soft or semi-soft multiple parton interactions (MPI). Of course the outgoing colored partons fragment into hadron “jet” and inevitably “underlying event”

• bservables receive contributions from initial-state radiation.

“Jet” Proton AntiProton

High PT Z-Boson Production

Z-boson

Outgoing Parton Initial-State Radiation Final-State Radiation

High PT Z-Boson Production

Z-boson

“Hard Scattering” Component

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 4

Jet #1 Direction ∆φ ∆φ ∆φ ∆φ

“Toward”

“Transverse” “Transverse”

“Away”

“Leading Jet”

“ “Towards Towards” ”, , “ “Away Away” ”, , “ “Transverse Transverse” ”

• CDF data at 1.96 TeV on the density of charged particles, dN/dη

η η ηdφ φ φ φ, with pT > 0.5 GeV/c and |η η η η| < 1 for “leading jet” events as a function of the leading jet pT for the “toward”, “away”, and “transverse”

• regions. The data are corrected to the particle level (with errors that include both the statistical error and

the systematic uncertainty) and are compared with PYTHIA Tune A at the particle level (i.e. generator level).

Charged Particle Density: dN/dη η η ηdφ φ φ φ

1 2 3 4 5 50 100 150 200 250 300 350 400

PT(jet#1) (GeV/c)

Average Charged Density

CDF Run 2 Preliminary

data corrected pyA generator level

"Leading Jet" MidPoint R=0.7 |η η η η(jet#1)|<2 Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) "Away" "Toward" "Transverse"

Factor of ~4.5

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 5

Jet #1 Direction ∆φ ∆φ ∆φ ∆φ

“Toward”

“Transverse” “Transverse”

“Away”

“Leading Jet”

“ “Towards Towards” ”, , “ “Away Away” ”, , “ “Transverse Transverse” ”

• CDF data at 1.96 TeV on the density of charged particles, dN/dη

η η ηdφ φ φ φ, with pT > 0.5 GeV/c and |η η η η| < 1 for “leading jet” events as a function of the leading jet pT for the “toward”, “away”, and “transverse”

• regions. The data are corrected to the particle level (with errors that include both the statistical error and

the systematic uncertainty) and are compared with PYTHIA Tune A at the particle level (i.e. generator level).

Charged Particle Density: dN/dη η η ηdφ φ φ φ

1 2 3 4 5 50 100 150 200 250 300 350 400

PT(jet#1) (GeV/c)

Average Charged Density

CDF Run 2 Preliminary

data corrected pyA generator level

"Leading Jet" MidPoint R=0.7 |η η η η(jet#1)|<2 Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) "Away" "Toward" "Transverse"

• CDF data at 1.96 TeV on the charged particle scalar pT sum density, dPT/dη

η η ηdφ φ φ φ, with pT > 0.5 GeV/c and |η η η η| < 1 for “leading jet” events as a function of the leading jet pT for the “toward”, “away”, and “transverse” regions. The data are corrected to the particle level (with errors that include both the statistical error and the systematic uncertainty) and are compared with PYTHIA Tune A at the particle level (i.e. generator level).

Factor of ~4.5

Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

0.1 1.0 10.0 100.0 50 100 150 200 250 300 350 400

PT(jet#1) (GeV/c)

Charged PTsum Density (GeV/c)

CDF Run 2 Preliminary

data corrected pyA generator level

"Leading Jet" MidPoint R=0.7 |η η η η(jet#1)|<2 Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) "Toward" "Away" "Transverse"

Factor of ~16

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 6

Z-Boson Direction ∆φ ∆φ ∆φ ∆φ

Charged Particle Density Charged Particle Density

• CDF data at 1.96 TeV on the density of charged particles, dN/dη

η η ηdφ φ φ φ, with pT > 0.5 GeV/c and |η η η η| < 1 for “Z- Boson” and “Leading Jet” events as a function of the leading jet pT or PT(Z) for the “toward”, “away”, and “transverse” regions. The data are corrected to the particle level and are compared with PYTHIA Tune AW and Tune A, respectively, at the particle level (i.e. generator level).

Jet #1 Direction ∆φ ∆φ ∆φ ∆φ

Charged Particle Density: dN/dη η η ηdφ φ φ φ

1 2 3 4 20 40 60 80 100 120 140 160 180 200

PT(jet#1) (GeV/c)

Average Charged Density

CDF Run 2 Preliminary

"Leading Jet" MidPoint R=0.7 |η η η η(jet#1)|<2 Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) "Away" "Toward" "Transverse"

Charged Particle Density: dN/dη η η ηdφ φ φ φ

1 2 3 20 40 60 80 100

PT(Z-Boson) (GeV/c)

Average Charged Density

CDF Run 2 Preliminary

"Away" "Transverse" "Toward" "Drell-Yan Production" 70 < M(pair) < 110 GeV Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) excluding the lepton-pair Proton AntiProton

High PT Z-Boson Production

Z-boson

Proton AntiProton

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 7

Z-Boson Direction ∆φ ∆φ ∆φ ∆φ

Charged Particle Density Charged Particle Density

• CDF data at 1.96 TeV on the density of charged particles, dN/dη

η η ηdφ φ φ φ, with pT > 0.5 GeV/c and |η η η η| < 1 for “Z- Boson” and “Leading Jet” events as a function of the leading jet pT or PT(Z) for the “toward”, “away”, and “transverse” regions. The data are corrected to the particle level and are compared with PYTHIA Tune AW and Tune A, respectively, at the particle level (i.e. generator level).

Jet #1 Direction ∆φ ∆φ ∆φ ∆φ

Charged Particle Density: dN/dη η η ηdφ φ φ φ

1 2 3 4 20 40 60 80 100 120 140 160 180 200

PT(jet#1) (GeV/c)

Average Charged Density

CDF Run 2 Preliminary

"Leading Jet" MidPoint R=0.7 |η η η η(jet#1)|<2 Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) "Away" "Toward" "Transverse"

Charged Particle Density: dN/dη η η ηdφ φ φ φ

1 2 3 20 40 60 80 100

PT(Z-Boson) (GeV/c)

Average Charged Density

CDF Run 2 Preliminary

"Away" "Transverse" "Toward" "Drell-Yan Production" 70 < M(pair) < 110 GeV Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) excluding the lepton-pair Proton AntiProton

High PT Z-Boson Production

Z-boson

Proton AntiProton

"Transverse" Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.3 0.6 0.9 1.2 20 40 60 80 100 120 140 160 180 200

PT(jet#1) or PT(Z-Boson) (GeV/c)

"Transverse" Charged Density

CDF Run 2 Preliminary

Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) "Leading Jet" "Z-Boson"

"Away" Charged Particle Density: dN/dη η η ηdφ φ φ φ

1 2 3 4 20 40 60 80 100 120 140 160 180 200

PT(jet#1) or PT(Z-Boson) (GeV/c)

"Away" Charged Density

CDF Run 2 Preliminary

Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) "Leading Jet" "Z-Boson"

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 8

Z-Boson Direction ∆φ ∆φ ∆φ ∆φ

Charged Particle Density Charged Particle Density

• CDF data at 1.96 TeV on the density of charged particles, dN/dη

η η ηdφ φ φ φ, with pT > 0.5 GeV/c and |η η η η| < 1 for “Z- Boson” and “Leading Jet” events as a function of the leading jet pT or PT(Z) for the “toward”, “away”, and “transverse” regions. The data are corrected to the particle level and are compared with PYTHIA Tune AW and Tune A, respectively, at the particle level (i.e. generator level).

Jet #1 Direction ∆φ ∆φ ∆φ ∆φ

Charged Particle Density: dN/dη η η ηdφ φ φ φ

1 2 3 4 20 40 60 80 100 120 140 160 180 200

PT(jet#1) (GeV/c)

Average Charged Density

CDF Run 2 Preliminary

"Leading Jet" MidPoint R=0.7 |η η η η(jet#1)|<2 Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) "Away" "Toward" "Transverse"

Charged Particle Density: dN/dη η η ηdφ φ φ φ

1 2 3 20 40 60 80 100

PT(Z-Boson) (GeV/c)

Average Charged Density

CDF Run 2 Preliminary

"Away" "Transverse" "Toward" "Drell-Yan Production" 70 < M(pair) < 110 GeV Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) excluding the lepton-pair Proton AntiProton

High PT Z-Boson Production

Z-boson

Proton AntiProton

"Transverse" Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.3 0.6 0.9 1.2 20 40 60 80 100 120 140 160 180 200

PT(jet#1) or PT(Z-Boson) (GeV/c)

"Transverse" Charged Density

CDF Run 2 Preliminary

Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) "Leading Jet" "Z-Boson"

"Away" Charged Particle Density: dN/dη η η ηdφ φ φ φ

1 2 3 4 20 40 60 80 100 120 140 160 180 200

PT(jet#1) or PT(Z-Boson) (GeV/c)

"Away" Charged Density

CDF Run 2 Preliminary

Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) "Leading Jet" "Z-Boson"

"Transverse" Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.4 0.8 1.2 50 100 150 200 250 300 350 400

PT(jet#1) GeV/c

Charged Particle Density

CDF 1.96 TeV Leading Jet RDF Preliminary

data corrected pyDW generator level

Charged Particles (PT>0.5 GeV/c, |η η η η| < 1.0)

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 9

Z-Boson Direction ∆φ ∆φ ∆φ ∆φ

Charged Charged PTsum PTsum Density Density

• CDF data at 1.96 TeV on the charged scalar PTsum density, dPT/dη

η η ηdφ φ φ φ, with pT > 0.5 GeV/c and |η η η η| < 1 for “Z- Boson” and “Leading Jet” events as a function of the leading jet pT or PT(Z) for the “toward”, “away”, and “transverse” regions. The data are corrected to the particle level and are compared with PYTHIA Tune AW and Tune A, respectively, at the particle level (i.e. generator level).

Jet #1 Direction ∆φ ∆φ ∆φ ∆φ

Proton AntiProton

High PT Z-Boson Production

Z-boson

Proton AntiProton

Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

0.1 1.0 10.0 20 40 60 80 100

PT(Z-Boson) (GeV/c)

Charged PTsum Density (GeV/c)

CDF Run 2 Preliminary

"Drell-Yan Production" 70 < M(pair) < 110 GeV "Away" "Transverse" "Toward" Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) excluding the lepton-pair

Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

0.1 1.0 10.0 100.0 20 40 60 80 100 120 140 160 180 200

PT(jet#1) (GeV/c)

Charged PTsum Density (GeV/c)

CDF Run 2 Preliminary

"Leading Jet" MidPoint R=0.7 |η η η η(jet#1)|<2 Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) "Toward" "Away" "Transverse"

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 10

Z-Boson Direction ∆φ ∆φ ∆φ ∆φ

Charged Charged PTsum PTsum Density Density

• CDF data at 1.96 TeV on the charged scalar PTsum density, dPT/dη

η η ηdφ φ φ φ, with pT > 0.5 GeV/c and |η η η η| < 1 for “Z- Boson” and “Leading Jet” events as a function of the leading jet pT or PT(Z) for the “toward”, “away”, and “transverse” regions. The data are corrected to the particle level and are compared with PYTHIA Tune AW and Tune A, respectively, at the particle level (i.e. generator level).

Jet #1 Direction ∆φ ∆φ ∆φ ∆φ

Proton AntiProton

High PT Z-Boson Production

Z-boson

Proton AntiProton

Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

0.1 1.0 10.0 20 40 60 80 100

PT(Z-Boson) (GeV/c)

Charged PTsum Density (GeV/c)

CDF Run 2 Preliminary

"Drell-Yan Production" 70 < M(pair) < 110 GeV "Away" "Transverse" "Toward" Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) excluding the lepton-pair

Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

0.1 1.0 10.0 100.0 20 40 60 80 100 120 140 160 180 200

PT(jet#1) (GeV/c)

Charged PTsum Density (GeV/c)

CDF Run 2 Preliminary

"Leading Jet" MidPoint R=0.7 |η η η η(jet#1)|<2 Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) "Toward" "Away" "Transverse"

"Transverse" Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

0.0 0.5 1.0 1.5 2.0 20 40 60 80 100 120 140 160 180 200

PT(jet#1) or PT(Z-Boson) (GeV/c)

"Transverse" PTsum Density (GeV/c)

CDF Run 2 Preliminary

Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) "Leading Jet" "Z-Boson"

"Away" Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

5 10 15 20 20 40 60 80 100 120 140 160 180 200

PT(jet#1) or PT(Z-Boson) (GeV/c)

"Away" PTsum Density (GeV/c)

CDF Run 2 Preliminary

Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) "Leading Jet" "Z-Boson"

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 11

Z-Boson Direction ∆φ ∆φ ∆φ ∆φ

Charged Charged PTsum PTsum Density Density

• CDF data at 1.96 TeV on the charged scalar PTsum density, dPT/dη

η η ηdφ φ φ φ, with pT > 0.5 GeV/c and |η η η η| < 1 for “Z- Boson” and “Leading Jet” events as a function of the leading jet pT or PT(Z) for the “toward”, “away”, and “transverse” regions. The data are corrected to the particle level and are compared with PYTHIA Tune AW and Tune A, respectively, at the particle level (i.e. generator level).

Jet #1 Direction ∆φ ∆φ ∆φ ∆φ

Proton AntiProton

High PT Z-Boson Production

Z-boson

Proton AntiProton

Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

0.1 1.0 10.0 20 40 60 80 100

PT(Z-Boson) (GeV/c)

Charged PTsum Density (GeV/c)

CDF Run 2 Preliminary

"Drell-Yan Production" 70 < M(pair) < 110 GeV "Away" "Transverse" "Toward" Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) excluding the lepton-pair

Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

0.1 1.0 10.0 100.0 20 40 60 80 100 120 140 160 180 200

PT(jet#1) (GeV/c)

Charged PTsum Density (GeV/c)

CDF Run 2 Preliminary

"Leading Jet" MidPoint R=0.7 |η η η η(jet#1)|<2 Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) "Toward" "Away" "Transverse"

"Transverse" Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

0.0 0.5 1.0 1.5 2.0 20 40 60 80 100 120 140 160 180 200

PT(jet#1) or PT(Z-Boson) (GeV/c)

"Transverse" PTsum Density (GeV/c)

CDF Run 2 Preliminary

Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) "Leading Jet" "Z-Boson"

"Away" Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

5 10 15 20 20 40 60 80 100 120 140 160 180 200

PT(jet#1) or PT(Z-Boson) (GeV/c)

"Away" PTsum Density (GeV/c)

CDF Run 2 Preliminary

Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) "Leading Jet" "Z-Boson"

"Transverse" Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

0.0 0.4 0.8 1.2 1.6 50 100 150 200 250 300 350 400

PT(jet#1) GeV/c

PTsum Density (GeV/c)

Charged Particles (PT>0.5 GeV/c, |η η η η| < 1.0)

CDF 1.96 TeV Leading Jet RDF Preliminary

data corrected pyDW generator level

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 12

Z Z-

• Boson:

Boson: “ “Towards Towards” ”, Transverse , Transverse” ”, , & & “ “TransMIN TransMIN” ” Charge Density Charge Density

• Data at 1.96 TeV on the density of charged particles, dN/dη

η η ηdφ φ φ φ, with pT > 0.5 GeV/c and |η η η η| < 1 for “Z-Boson” events as a function of PT(Z) for the “toward” and “transverse” regions. The data are corrected to the particle level (with errors that include both the statistical error and the systematic uncertainty) and are compared with PYTHIA Tune AW and HERWIG (without MPI) at the particle level (i.e. generator level).

Z-BosonDirection ∆φ ∆φ ∆φ ∆φ

Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.3 0.6 0.9 20 40 60 80 100

PT(Z-Boson) (GeV/c) Charged Density

CDF Run 2 Preliminary

data corrected pyAW generator level

"Transverse "Toward" "Drell-Yan Production" 70 < M(pair) < 110 GeV Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) excluding the lepton-pair

Proton AntiProton

High PT Z-Boson Production

Z-boson

Proton AntiProton

High PT Z-Boson Production

Z-boson

Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.3 0.6 0.9 20 40 60 80 100

PT(Z-Boson) (GeV/c) Charged Density

CDF Run 2 Preliminary

data corrected pyAW generator level

"Drell-Yan Production" 70 < M(pair) < 110 GeV Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) excluding the lepton-pair "Toward" "transMIN" Z-Boson Direction ∆φ ∆φ ∆φ ∆φ

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 13

Z Z-

• Boson:

Boson: “ “Towards Towards” ”, Transverse , Transverse” ”, , & & “ “TransMIN TransMIN” ” Charge Density Charge Density

• Data at 1.96 TeV on the density of charged particles, dN/dη

η η ηdφ φ φ φ, with pT > 0.5 GeV/c and |η η η η| < 1 for “Z-Boson” events as a function of PT(Z) for the “toward” and “transverse” regions. The data are corrected to the particle level (with errors that include both the statistical error and the systematic uncertainty) and are compared with PYTHIA Tune AW and HERWIG (without MPI) at the particle level (i.e. generator level).

Z-BosonDirection ∆φ ∆φ ∆φ ∆φ

Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.3 0.6 0.9 20 40 60 80 100

PT(Z-Boson) (GeV/c) Charged Density

CDF Run 2 Preliminary

data corrected pyAW generator level

"Transverse "Toward" "Drell-Yan Production" 70 < M(pair) < 110 GeV Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) excluding the lepton-pair

Proton AntiProton

High PT Z-Boson Production

Z-boson

Proton AntiProton

High PT Z-Boson Production

Z-boson

Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.3 0.6 0.9 20 40 60 80 100

PT(Z-Boson) (GeV/c) Charged Density

CDF Run 2 Preliminary

data corrected pyAW generator level

"Drell-Yan Production" 70 < M(pair) < 110 GeV Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) excluding the lepton-pair "Toward" "transMIN" Z-Boson Direction ∆φ ∆φ ∆φ ∆φ

"Toward" Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.3 0.6 0.9 20 40 60 80 100

PT(Z-Boson) (GeV/c)

"Toward" Charged Density

CDF Run 2 Preliminary

data corrected generator level theory

"Drell-Yan Production" 70 < M(pair) < 110 GeV Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) excluding the lepton-pair HW JIM pyAW ATLAS pyDW

"TransMIN" Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.2 0.4 0.6 20 40 60 80 100

PT(Z-Boson) (GeV/c)

"TransMIN" Charged Density

CDF Run 2 Preliminary

data corrected generator level theory

"Drell-Yan Production" 70 < M(pair) < 110 GeV Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) excluding the lepton-pair ATLAS HW pyAW JIM pyDW

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 14

Z Z-

• Boson:

Boson: “ “Towards Towards” ”, Transverse , Transverse” ”, , & & “ “TransMIN TransMIN” ” Charge Density Charge Density

• Data at 1.96 TeV on the density of charged particles, dN/dη

η η ηdφ φ φ φ, with pT > 0.5 GeV/c and |η η η η| < 1 for “Z-Boson” events as a function of PT(Z) for the “toward” and “transverse” regions. The data are corrected to the particle level (with errors that include both the statistical error and the systematic uncertainty) and are compared with PYTHIA Tune AW and HERWIG (without MPI) at the particle level (i.e. generator level).

Z-BosonDirection ∆φ ∆φ ∆φ ∆φ

Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.3 0.6 0.9 20 40 60 80 100

PT(Z-Boson) (GeV/c) Charged Density

CDF Run 2 Preliminary

data corrected pyAW generator level

"Transverse "Toward" "Drell-Yan Production" 70 < M(pair) < 110 GeV Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) excluding the lepton-pair

Proton AntiProton

High PT Z-Boson Production

Z-boson

Proton AntiProton

High PT Z-Boson Production

Z-boson

Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.3 0.6 0.9 20 40 60 80 100

PT(Z-Boson) (GeV/c) Charged Density

CDF Run 2 Preliminary

data corrected pyAW generator level

"Drell-Yan Production" 70 < M(pair) < 110 GeV Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) excluding the lepton-pair "Toward" "transMIN" Z-Boson Direction ∆φ ∆φ ∆φ ∆φ

"Toward" Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.3 0.6 0.9 20 40 60 80 100

PT(Z-Boson) (GeV/c)

"Toward" Charged Density

CDF Run 2 Preliminary

data corrected generator level theory

"Drell-Yan Production" 70 < M(pair) < 110 GeV Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) excluding the lepton-pair HW JIM pyAW ATLAS pyDW

"TransMIN" Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.2 0.4 0.6 20 40 60 80 100

PT(Z-Boson) (GeV/c)

"TransMIN" Charged Density

CDF Run 2 Preliminary

data corrected generator level theory

"Drell-Yan Production" 70 < M(pair) < 110 GeV Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) excluding the lepton-pair ATLAS HW pyAW JIM pyDW

"TransMIN" Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.2 0.4 0.6 0.8 20 40 60 80 100 120 140 160 180 200

PT(jet#1) or PT(Z-Boson) (GeV/c)

"TransMIN" Charged Density

CDF Run 2 Preliminary

data corrected generator level theory

Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) "Leading Jet" "Z-Boson"

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 15

Z Z-

• Boson:

Boson: “ “Towards Towards” ”, Transverse , Transverse” ”, , & & “ “TransMIN TransMIN” ” Charge Density Charge Density

• Data at 1.96 TeV on the charged scalar PTsum density, dPT/dη

η η ηdφ φ φ φ, with pT > 0.5 GeV/c and |η η η η| < 1 for “Z-Boson” events as a function of PT(Z) for the “toward” and “transverse” regions. The data are corrected to the particle level (with errors that include both the statistical error and the systematic uncertainty) and are compared with PYTHIA Tune AW and HERWIG (without MPI) at the particle level (i.e. generator level).

Z-BosonDirection ∆φ ∆φ ∆φ ∆φ

Proton AntiProton

High PT Z-Boson Production

Z-boson

Proton AntiProton

High PT Z-Boson Production

Z-boson

Z-Boson Direction ∆φ ∆φ ∆φ ∆φ

Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

0.0 0.6 1.2 1.8 20 40 60 80 100

PT(Z-Boson) (GeV/c)

Charged PTsum Density (GeV/c)

CDF Run 2 Preliminary

data corrected pyAW generator level

"Drell-Yan Production" 70 < M(pair) < 110 GeV Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) excluding the lepton-pair "Transverse "Toward"

Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

0.0 0.4 0.8 1.2 20 40 60 80 100

PT(Z-Boson) (GeV/c)

Charged PTsum Density (GeV/c)

CDF Run 2 Preliminary

data corrected pyAW generator level

"Drell-Yan Production" 70 < M(pair) < 110 GeV Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) excluding the lepton-pair "transMIN" "Toward"

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 16

Z Z-

• Boson:

Boson: “ “Towards Towards” ”, Transverse , Transverse” ”, , & & “ “TransMIN TransMIN” ” Charge Density Charge Density

• Data at 1.96 TeV on the charged scalar PTsum density, dPT/dη

η η ηdφ φ φ φ, with pT > 0.5 GeV/c and |η η η η| < 1 for “Z-Boson” events as a function of PT(Z) for the “toward” and “transverse” regions. The data are corrected to the particle level (with errors that include both the statistical error and the systematic uncertainty) and are compared with PYTHIA Tune AW and HERWIG (without MPI) at the particle level (i.e. generator level).

Z-BosonDirection ∆φ ∆φ ∆φ ∆φ

Proton AntiProton

High PT Z-Boson Production

Z-boson

Proton AntiProton

High PT Z-Boson Production

Z-boson

Z-Boson Direction ∆φ ∆φ ∆φ ∆φ

Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

0.0 0.6 1.2 1.8 20 40 60 80 100

PT(Z-Boson) (GeV/c)

Charged PTsum Density (GeV/c)

CDF Run 2 Preliminary

data corrected pyAW generator level

"Drell-Yan Production" 70 < M(pair) < 110 GeV Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) excluding the lepton-pair "Transverse "Toward"

Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

0.0 0.4 0.8 1.2 20 40 60 80 100

PT(Z-Boson) (GeV/c)

Charged PTsum Density (GeV/c)

CDF Run 2 Preliminary

data corrected pyAW generator level

"Drell-Yan Production" 70 < M(pair) < 110 GeV Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) excluding the lepton-pair "transMIN" "Toward"

"Toward" Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

0.0 0.4 0.8 1.2 20 40 60 80 100

PT(Z-Boson) (GeV/c)

"Toward" PTsum Density (GeV/c)

CDF Run 2 Preliminary

data corrected generator level theory

"Drell-Yan Production" 70 < M(pair) < 110 GeV Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) excluding the lepton-pair HW JIM ATLAS pyAW pyDW

"TransMIN" Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

0.0 0.2 0.4 0.6 0.8 20 40 60 80 100

PT(Z-Boson) (GeV/c)

"TransMIN" PTsum Density (GeV/c)

CDF Run 2 Preliminary

data corrected generator level theory

"Drell-Yan Production" 70 < M(pair) < 110 GeV Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) excluding the lepton-pair HW ATLAS pyAW JIM pyDW

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 17

Z Z-

• Boson:

Boson: “ “Towards Towards” ”, Transverse , Transverse” ”, , & & “ “TransMIN TransMIN” ” Charge Density Charge Density

• Data at 1.96 TeV on the charged scalar PTsum density, dPT/dη

η η ηdφ φ φ φ, with pT > 0.5 GeV/c and |η η η η| < 1 for “Z-Boson” events as a function of PT(Z) for the “toward” and “transverse” regions. The data are corrected to the particle level (with errors that include both the statistical error and the systematic uncertainty) and are compared with PYTHIA Tune AW and HERWIG (without MPI) at the particle level (i.e. generator level).

Z-BosonDirection ∆φ ∆φ ∆φ ∆φ

Proton AntiProton

High PT Z-Boson Production

Z-boson

Proton AntiProton

High PT Z-Boson Production

Z-boson

Z-Boson Direction ∆φ ∆φ ∆φ ∆φ

Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

0.0 0.6 1.2 1.8 20 40 60 80 100

PT(Z-Boson) (GeV/c)

Charged PTsum Density (GeV/c)

CDF Run 2 Preliminary

data corrected pyAW generator level

"Drell-Yan Production" 70 < M(pair) < 110 GeV Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) excluding the lepton-pair "Transverse "Toward"

Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

0.0 0.4 0.8 1.2 20 40 60 80 100

PT(Z-Boson) (GeV/c)

Charged PTsum Density (GeV/c)

CDF Run 2 Preliminary

data corrected pyAW generator level

"Drell-Yan Production" 70 < M(pair) < 110 GeV Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) excluding the lepton-pair "transMIN" "Toward"

"Toward" Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

0.0 0.4 0.8 1.2 20 40 60 80 100

PT(Z-Boson) (GeV/c)

"Toward" PTsum Density (GeV/c)

CDF Run 2 Preliminary

data corrected generator level theory

"Drell-Yan Production" 70 < M(pair) < 110 GeV Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) excluding the lepton-pair HW JIM ATLAS pyAW pyDW

"TransMIN" Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

0.0 0.2 0.4 0.6 0.8 20 40 60 80 100

PT(Z-Boson) (GeV/c)

"TransMIN" PTsum Density (GeV/c)

CDF Run 2 Preliminary

data corrected generator level theory

"Drell-Yan Production" 70 < M(pair) < 110 GeV Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) excluding the lepton-pair HW ATLAS pyAW JIM pyDW

"TransMIN" Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

0.0 0.2 0.4 0.6 0.8 20 40 60 80 100 120 140 160 180 200

PT(jet#1) or PT(Z-Boson) (GeV/c)

"TransMIN" PTsum Density (GeV/c)

CDF Run 2 Preliminary

data corrected generator level theory

Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) "Leading Jet" "Z-Boson"

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 18

Z Z-

• Boson:

Boson: “ “Towards Towards” ” Region Region

• Data at 1.96 TeV on the density of charged particles, dN/dη

η η ηdφ φ φ φ, with pT > 0.5 GeV/c and |η η η η| < 1 for “Z-Boson” events as a function of PT(Z) for the “toward” region. The data are corrected to the particle level (with errors that include both the statistical error and the systematic uncertainty) and are compared with PYTHIA Tune AW, Tune DW, PYTHIA ATLAS Tune, HERWIG (without MPI), and HERWIG (with JIMMY MPI) at the particle level (i.e. generator level).

Z-BosonDirection ∆φ ∆φ ∆φ ∆φ

Z-BosonDirection ∆φ ∆φ ∆φ ∆φ

"Toward" Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.3 0.6 0.9 20 40 60 80 100

PT(Z-Boson) (GeV/c)

"Toward" Charged Density

CDF Run 2 Preliminary

data corrected generator level theory

"Drell-Yan Production" 70 < M(pair) < 110 GeV Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) excluding the lepton-pair HW JIM pyAW ATLAS pyDW

"Toward" Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.4 0.8 1.2 1.6 25 50 75 100 125 150

PT(lepton-pair) (GeV/c)

"Toward" Charged Density

CDF Run 2 Preliminary

data corrected generator level theory

"Drell-Yan Production" 70 < M(pair) < 110 GeV Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) excluding the lepton-pair Tevatron py Tune DW py Tune DWT

LHC

Tevatron LHC

≈2.1 ≈2.6

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 19

Z Z-

• Boson:

Boson: “ “Towards Towards” ” Region Region

• Data at 1.96 TeV on the density of charged particles, dN/dη

η η ηdφ φ φ φ, with pT > 0.5 GeV/c and |η η η η| < 1 for “Z-Boson” events as a function of PT(Z) for the “toward” region. The data are corrected to the particle level (with errors that include both the statistical error and the systematic uncertainty) and are compared with PYTHIA Tune AW, Tune DW, PYTHIA ATLAS Tune, HERWIG (without MPI), and HERWIG (with JIMMY MPI) at the particle level (i.e. generator level).

Z-BosonDirection ∆φ ∆φ ∆φ ∆φ

Z-BosonDirection ∆φ ∆φ ∆φ ∆φ

"Toward" Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.3 0.6 0.9 20 40 60 80 100

PT(Z-Boson) (GeV/c)

"Toward" Charged Density

CDF Run 2 Preliminary

data corrected generator level theory

"Drell-Yan Production" 70 < M(pair) < 110 GeV Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) excluding the lepton-pair HW JIM pyAW ATLAS pyDW

"Toward" Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.4 0.8 1.2 1.6 25 50 75 100 125 150

PT(lepton-pair) (GeV/c)

"Toward" Charged Density

CDF Run 2 Preliminary

data corrected generator level theory

"Drell-Yan Production" 70 < M(pair) < 110 GeV Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) excluding the lepton-pair Tevatron py Tune DW py Tune DWT

LHC

Tevatron LHC

≈2.1 ≈2.6

"Toward" Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.4 0.8 1.2 1.6 25 50 75 100 125 150

PT(lepton-pair) (GeV/c)

"Toward" Charged Density

pyDWT LHC

generator level theory

"Drell-Yan Production" 70 < M(pair) < 110 GeV Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) excluding the lepton-pair HW LHC pyDW LHC pyDW Tevatron HW Tevatron

HERWIG (without MPI) small change!

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 20

Z Z-

• Boson:

Boson: “ “Towards Towards” ” Region Region

• Data at 1.96 TeV on the density of charged particles, dN/dη

η η ηdφ φ φ φ, with pT > 0.5 GeV/c and |η η η η| < 1 for “Z- Boson” events as a function of PT(Z) for the “toward” region from PYTHIA Tune AW, Tune DW, Tune S320, and Tune P329 at the particle level (i.e. generator level).

Z-BosonDirection ∆φ ∆φ ∆φ ∆φ

Z-BosonDirection ∆φ ∆φ ∆φ ∆φ

"Toward" Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.2 0.4 0.6 0.8 25 50 75 100 125 150

Lepton-Pair PT (GeV/c)

"Toward" Charged Density

RDF Preliminary

generator level

70 < M(pair) < 110 GeV Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c)

Drell-Yan 1.96 TeV

PY Tune DW PY Tune AW PY64 Tune S320 PY64 Tune P329

Tevatron LHC

• Extrapolations of PYTHIA Tune AW, Tune DW, Tune DWT, Tune S320, and Tune P329, and pyATLAS

to the LHC.

RDF LHC Prediction!

"Toward" Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.4 0.8 1.2 1.6 25 50 75 100 125 150

Lepton-Pair PT (GeV/c)

"Toward" Charged Density Drell-Yan 14 TeV

70 < M(pair) < 110 GeV Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c)

RDF Preliminary

generator level PY Tune DWT PY Tune DW PY64 Tune P329 PY64 Tune S320 PY ATLAS

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 21

Z Z-

• Boson:

Boson: “ “Towards Towards” ” Region Region

• Data at 1.96 TeV on the density of charged particles, dN/dη

η η ηdφ φ φ φ, with pT > 0.5 GeV/c and |η η η η| < 1 for “Z- Boson” events as a function of PT(Z) for the “toward” region from PYTHIA Tune AW, Tune DW, Tune S320, and Tune P329 at the particle level (i.e. generator level).

Z-BosonDirection ∆φ ∆φ ∆φ ∆φ

Z-BosonDirection ∆φ ∆φ ∆φ ∆φ

"Toward" Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.2 0.4 0.6 0.8 25 50 75 100 125 150

Lepton-Pair PT (GeV/c)

"Toward" Charged Density

RDF Preliminary

generator level

70 < M(pair) < 110 GeV Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c)

Drell-Yan 1.96 TeV

PY Tune DW PY Tune AW PY64 Tune S320 PY64 Tune P329

Tevatron LHC

• Extrapolations of PYTHIA Tune AW, Tune DW, Tune DWT, Tune S320, and Tune P329, and pyATLAS

to the LHC.

RDF LHC Prediction!

"Toward" Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.4 0.8 1.2 1.6 25 50 75 100 125 150

Lepton-Pair PT (GeV/c)

"Toward" Charged Density Drell-Yan 14 TeV

70 < M(pair) < 110 GeV Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c)

RDF Preliminary

generator level PY Tune DWT PY Tune DW PY64 Tune P329 PY64 Tune S320 PY ATLAS

If the LHC data are not in the range shown here then we learn new (QCD) physics!

Rick Field MB&UE@CMS Workshop CERN, November 6, 2009

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 22

“ “Transverse Transverse” ” Charged Particle Density Charged Particle Density

• Fake data (from MC) at 900 GeV on the

“transverse” charged particle density, dN/dη η η ηdφ φ φ φ, as defined by the leading charged particle (PTmax) and the leading charged particle jet (chgjet#1) for charged particles with pT > 0.5 GeV/c and |η η η η| < 2. The fake data (from PYTHIA Tune DW) are generated at the particle level (i.e. generator level) assuming 0.5 M min-bias events at 900 GeV (361,595 events in the plot).

PT(chgjet#1) Direction ∆φ ∆φ ∆φ ∆φ

“Toward”

“Transverse” “Transverse”

“Away”

"Transverse" Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.2 0.4 0.6 0.8 2 4 6 8 10 12 14 16 18

PTmax or PT(chgjet#1) (GeV/c)

"Transverse" Charged Density

900 GeV

Charged Particles (|η η η η|<2.0, PT>0.5 GeV/c)

RDF Preliminary

Fake Data pyDW generator level

ChgJet#1 PTmax

Rick Field MB&UE@CMS Workshop CERN, November 6, 2009

PTmax Direction ∆φ ∆φ ∆φ ∆φ

“Toward”

“Transverse” “Transverse”

“Away”

Leading Charged Particle Jet, chgjet#1. Leading Charged Particle, PTmax.

Prediction!

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 23

“ “Transverse Transverse” ” Charged Particle Density Charged Particle Density

• Fake data (from MC) at 900 GeV on the

“transverse” charged particle density, dN/dη η η ηdφ φ φ φ, as defined by the leading charged particle (PTmax) and the leading charged particle jet (chgjet#1) for charged particles with pT > 0.5 GeV/c and |η η η η| < 2. The fake data (from PYTHIA Tune DW) are generated at the particle level (i.e. generator level) assuming 0.5 M min-bias events at 900 GeV (361,595 events in the plot).

"Transverse" Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.2 0.4 0.6 0.8 2 4 6 8 10 12 14 16 18

PTmax or PT(chgjet#1) (GeV/c)

"Transverse" Charged Density

900 GeV

Charged Particles (|η η η η|<2.0, PT>0.5 GeV/c)

RDF Preliminary

Fake Data pyDW generator level

ChgJet#1 PTmax

• CMS preliminary data at 900 GeV on the

“transverse” charged particle density, dN/dη η η ηdφ φ φ φ, as defined by the leading charged particle (PTmax) and the leading charged particle jet (chgjet#1) for charged particles with pT > 0.5 GeV/c and |η η η η| < 2. The data are uncorrected and compared with PYTHIA Tune DW after detector simulation (216,215 events in the plot).

"Transverse" Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.2 0.4 0.6 0.8 2 4 6 8 10 12 14 16 18

PTmax or PT(chgjet#1) (GeV/c)

"Transverse" Charged Density

CMS Preliminary

data uncorrected pyDW + SIM

900 GeV

ChgJet#1 PTmax Charged Particles (|η η η η|<2.0, PT>0.5 GeV/c)

Real Data! Monte-Carlo!

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 24

“ “Transverse Transverse” ” Charged Charged PTsum PTsum Density Density

"Transverse" Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

0.0 0.2 0.4 0.6 0.8 2 4 6 8 10 12 14 16 18

PTmax or PT(chgjet#1) (GeV/c)

PTsum Density (GeV/c)

900 GeV

Charged Particles (|η η η η|<2.0, PT>0.5 GeV/c) ChgJet#1 PTmax

RDF Preliminary

Fake Data pyDW generator level

• Fake data (from MC) at 900 GeV on the

“transverse” charged PTsum density, dPT/dη η η ηdφ φ φ φ, as defined by the leading charged particle (PTmax) and the leading charged particle jet (chgjet#1) for charged particles with pT > 0.5 GeV/c and |η η η η| < 2. The fake data (from PYTHIA Tune DW) are generated at the particle level (i.e. generator level) assuming 0.5 M min-bias events at 900 GeV (361,595 events in the plot).

"Transverse" Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

0.0 0.2 0.4 0.6 0.8 2 4 6 8 10 12 14 16 18

PTmax or PT(chgjet#1) (GeV/c)

PTsum Density (GeV/c)

CMS Preliminary

data uncorrected pyDW + SIM

900 GeV

Charged Particles (|η η η η|<2.0, PT>0.5 GeV/c) ChgJet#1 PTmax

• CMS preliminary data at 900 GeV on the

“transverse” charged PTsum density, dPT/dη η η ηdφ φ φ φ, as defined by the leading charged particle (PTmax) and the leading charged particle jet (chgjet#1) for charged particles with pT > 0.5 GeV/c and |η η η η| < 2. The data are uncorrected and compared with PYTHIA Tune DW after detector simulation (216,215 events in the plot).

Real Data! Monte-Carlo!

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 25

“ “Transverse Transverse” ” Charge Density Charge Density

PTmax Direction ∆φ ∆φ ∆φ ∆φ

PTmax Direction ∆φ ∆φ ∆φ ∆φ

LHC 900 GeV LHC 7 TeV 900 GeV → 7 TeV (UE increase ~ factor of 2)

"Transverse" Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.4 0.8 1.2 2 4 6 8 10 12 14 16 18 20

PTmax (GeV/c)

"Transverse" Charged Density

Charged Particles (|η η η η|<2.0, PT>0.5 GeV/c)

RDF Preliminary

py Tune DW generator level

900 GeV 7 TeV

• Shows the charged particle density in the “transverse” region for charged particles (pT > 0.5

GeV/c, |η η η η| < 2) at 900 GeV and 7 TeV as defined by PTmax from PYTHIA Tune DW and at the particle level (i.e. generator level).

factor of 2!

~0.4 → ~0.8

Rick Field MB&UE@CMS Workshop CERN, November 6, 2009 Prediction!

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 26

PYTHIA Tune DW PYTHIA Tune DW

• Ratio of CMS preliminary data at 900 GeV

and 7 TeV on the “transverse” charged particle density, dN/dη η η ηdφ φ φ φ, as defined by the leading charged particle jet (chgjet#1) for charged particles with pT > 0.5 GeV/c and |η η η η| < 2. The data are uncorrected and compared with PYTHIA Tune DW after detector simulation.

"Transverse" Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 1.0 2.0 3.0 2 4 6 8 10 12 14 16 18

PT(chgjet#1) (GeV/c)

Ratio: 7 TeV/900 GeV

CMS Preliminary

data uncorrected pyDW + SIM

Charged Particles (|η η η η|<2.0, PT>0.5 GeV/c) 7 TeV / 900 GeV

CMS

PT(chgjet#1) Direction ∆φ ∆φ ∆φ ∆φ

• CMS preliminary data at 900 GeV and 7 TeV
• n the “transverse” charged particle density,

dN/dη η η ηdφ φ φ φ, as defined by the leading charged particle jet (chgjet#1) for charged particles with pT > 0.5 GeV/c and |η η η η| < 2. The data are uncorrected and compared with PYTHIA Tune DW after detector simulation.

"Transverse" Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.4 0.8 1.2 5 10 15 20 25 30 35 40 45 50

PT(chgjet#1) GeV/c

Charged Particle Density

900 GeV CMS Preliminary

data uncorrected pyDW + SIM

Charged Particles (|η η η η|<2.0, PT>0.5 GeV/c)

7 TeV

CMS

PT(chgjet#1) Direction ∆φ ∆φ ∆φ ∆φ

Ratio

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 27

PYTHIA Tune DW PYTHIA Tune DW

• Ratio of CMS preliminary data at 900 GeV

and 7 TeV on the “transverse” charged particle density, dN/dη η η ηdφ φ φ φ, as defined by the leading charged particle jet (chgjet#1) for charged particles with pT > 0.5 GeV/c and |η η η η| < 2. The data are uncorrected and compared with PYTHIA Tune DW after detector simulation.

• Ratio of the ATLAS preliminary data at

900 GeV and 7 TeV on the “transverse” charged particle density, dN/dη η η ηdφ φ φ φ, as defined by the leading charged particle (PTmax) for charged particles with pT > 0.5 GeV/c and |η η η η| < 2.5. The data are corrected and compared with PYTHIA Tune DW at the generator level.

"Transverse" Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 1.0 2.0 3.0 2 4 6 8 10 12 14 16 18

PT(chgjet#1) (GeV/c)

Ratio: 7 TeV/900 GeV

CMS Preliminary

data uncorrected pyDW + SIM

Charged Particles (|η η η η|<2.0, PT>0.5 GeV/c) 7 TeV / 900 GeV

"Transverse" Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 1.0 2.0 3.0 1 2 3 4 5 6 7 8 9 10 11 12

PTmax (GeV/c)

Ratio: 7 TeV/900 GeV

Charged Particles (|η η η η|<2.5, PT>0.5 GeV/c)

RDF Preliminary

ATLAS corrected data pyDW generator level

7 TeV / 900 GeV

CMS ATLAS

PTmax Direction ∆φ ∆φ ∆φ ∆φ

PT(chgjet#1) Direction ∆φ ∆φ ∆φ ∆φ

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 28

PYTHIA Tune DW PYTHIA Tune DW

• Ratio of the CMS preliminary data at 900

GeV and 7 TeV on the “transverse” charged PTsum density, dPT/dη η η ηdφ φ φ φ, as defined by the leading charged particle jet (chgjet#1) for charged particles with pT > 0.5 GeV/c and |η η η η| < 2. The data are uncorrected and compared with PYTHIA Tune DW after detector simulation.

• Ratio of the ATLAS preliminary data at

900 GeV and 7 TeV on the “transverse” charged PTsum density, dPT/dη η η ηdφ φ φ φ, as defined by the leading charged particle (PTmax) for charged particles with pT > 0.5 GeV/c and |η η η η| < 2.5. The data are corrected and compared with PYTHIA Tune DW at the generator level.

"Transverse" Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

0.0 1.0 2.0 3.0 4.0 1 2 3 4 5 6 7 8 9 10 11 12

PTmax (GeV/c)

Ratio: 7 TeV/900 GeV

Charged Particles (|η η η η|<2.5, PT>0.5 GeV/c)

RDF Preliminary

ATLAS corrected data pyDW generator level

7 TeV / 900 GeV

"Transverse" Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

0.0 1.0 2.0 3.0 4.0 2 4 6 8 10 12 14 16 18

PT(chgjet#1) (GeV/c)

Ratio: 7 TeV/900 GeV

CMS Preliminary

data uncorrected pyDW + SIM

Charged Particles (|η η η η|<2.0, PT>0.5 GeV/c) 7 TeV / 900 GeV

CMS ATLAS

PTmax Direction ∆φ ∆φ ∆φ ∆φ

PT(chgjet#1) Direction ∆φ ∆φ ∆φ ∆φ

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 29

PYTHIA Tune DW PYTHIA Tune DW

PTmax Direction ∆φ ∆φ ∆φ ∆φ

"Transverse" Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.4 0.8 1.2 2 4 6 8 10 12 14 16 18 20

PTmax (GeV/c)

"Transverse" Charged Density

RDF Preliminary

ATLAS corrected data Tune DW generator level

900 GeV 7 TeV

Charged Particles (|η η η η|<2.5, PT>0.5 GeV/c)

• ATLAS preliminary data at 900 GeV and 7

TeV on the “transverse” charged particle density, dN/dη η η ηdφ φ φ φ, as defined by the leading charged particle (PTmax) for charged particles with pT > 0.5 GeV/c and |η η η η| < 2.5. The data are corrected and compared with PYTHIA Tune DW at the generator level.

• CMS preliminary data at 900 GeV and 7 TeV
• n the “transverse” charged particle density,

dN/dη η η ηdφ φ φ φ, as defined by the leading charged particle jet (chgjet#1) for charged particles with pT > 0.5 GeV/c and |η η η η| < 2. The data are uncorrected and compared with PYTHIA Tune DW after detector simulation.

"Transverse" Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.4 0.8 1.2 5 10 15 20 25 30 35 40 45 50

PT(chgjet#1) GeV/c

Charged Particle Density

900 GeV CMS Preliminary

data uncorrected pyDW + SIM

Charged Particles (|η η η η|<2.0, PT>0.5 GeV/c)

7 TeV

CMS ATLAS

PT(chgjet#1) Direction ∆φ ∆φ ∆φ ∆φ

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 30

PYTHIA Tune DW PYTHIA Tune DW

• CMS preliminary data at 900 GeV and 7

TeV on the “transverse” charged PTsum density, dPT/dη η η ηdφ φ φ φ, as defined by the leading charged particle jet (chgjet#1) for charged particles with pT > 0.5 GeV/c and |η η η η| < 2. The data are uncorrected and compared with PYTHIA Tune DW after detector simulation.

• ATLAS preliminary data at 900 GeV and

7 TeV on the “transverse” charged PTsum density, dPT/dη η η ηdφ φ φ φ, as defined by the leading charged particle (PTmax) for charged particles with pT > 0.5 GeV/c and |η η η η| < 2.5. The data are corrected and compared with PYTHIA Tune DW at the generator level.

"Transverse" Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

0.0 0.4 0.8 1.2 1.6 5 10 15 20 25 30 35 40 45 50

PT(chgjet#1) (GeV/c)

Charged PTsum Density (GeV/c)

CMS Preliminary

data uncorrected pyDW + SIM

Charged Particles (|η η η η|<2.0, PT>0.5 GeV/c)

900 GeV 7 TeV

"Transverse" Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

0.0 0.5 1.0 1.5 2 4 6 8 10 12 14 16 18 20

PTmax (GeV/c)

PTsum Density (GeV/c)

RDF Preliminary

ATLAS corrected data Tune DW generator level

900 GeV 7 TeV

Charged Particles (|η η η η|<2.5, PT>0.5 GeV/c)

CMS ATLAS

PTmax Direction ∆φ ∆φ ∆φ ∆φ

PT(chgjet#1) Direction ∆φ ∆φ ∆φ ∆φ

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 31

Z-Boson Direction ∆φ ∆φ ∆φ ∆φ

Charged Particle Density Charged Particle Density

• CDF data at 1.96 TeV on the density of charged particles, dN/dη

η η ηdφ φ φ φ, with pT > 0.5 GeV/c and |η η η η| < 1 for Drell-Yan production as a function of PT(Z) for the “toward”, “away”, and “transverse” regions compared with PYTHIA Tune DW.

Z-Boson Direction ∆φ ∆φ ∆φ ∆φ

Proton Proton

High PT Z-Boson Production

Z-boson

Charged Particle Density: dN/dη η η ηdφ φ φ φ

1 2 3 20 40 60 80 100

PT(lepton-pair) GeV/c

Average Charged Density

CMS Preliminary

data corrected pyDW generator level

Charged Particles (|η η η η|<2.0, PT>0.5 GeV/c) excluding the lepton-pair "Away" "Transverse" "Toward" Drell-Yan Production 60 < M(pair) < 120 GeV

7 TeV

Proton AntiProton

High PT Z-Boson Production

Z-boson

Charged Particle Density: dN/dη η η ηdφ φ φ φ

1 2 3 10 20 30 40 50 60 70 80 90 100

PT(lepton-pair) GeV/c

Average Charged Density

CDF Run 2

data corrected pyDW generator level

Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) excluding the lepton-pair "Away" "Transverse" "Toward" Drell-Yan Production 70 < M(pair) < 110 GeV

1.96 TeV

• CMS data at 7 TeV on the density of charged particles, dN/dη

η η ηdφ φ φ φ, with pT > 0.5 GeV/c and |η η η η| < 2 for Drell- Yan production as a function of PT(Z) for the “toward”, “away”, and “transverse” regions compared with PYTHIA Tune DW.

CMS

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 32

Z-Boson Direction ∆φ ∆φ ∆φ ∆φ

Charged Particle Density Charged Particle Density

• CDF data at 1.96 TeV on the density of charged particles, dN/dη

η η ηdφ φ φ φ, with pT > 0.5 GeV/c and |η η η η| < 1 for Drell-Yan production as a function of PT(Z) for the “toward”, “away”, and “transverse” regions compared with PYTHIA Tune DW.

Z-Boson Direction ∆φ ∆φ ∆φ ∆φ

Proton Proton

High PT Z-Boson Production

Z-boson

Charged Particle Density: dN/dη η η ηdφ φ φ φ

1 2 3 20 40 60 80 100

PT(lepton-pair) GeV/c

Average Charged Density

CMS Preliminary

data corrected pyDW generator level

Charged Particles (|η η η η|<2.0, PT>0.5 GeV/c) excluding the lepton-pair "Away" "Transverse" "Toward" Drell-Yan Production 60 < M(pair) < 120 GeV

7 TeV

Proton AntiProton

High PT Z-Boson Production

Z-boson

Charged Particle Density: dN/dη η η ηdφ φ φ φ

1 2 3 10 20 30 40 50 60 70 80 90 100

PT(lepton-pair) GeV/c

Average Charged Density

CDF Run 2

data corrected pyDW generator level

Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) excluding the lepton-pair "Away" "Transverse" "Toward" Drell-Yan Production 70 < M(pair) < 110 GeV

1.96 TeV

• CMS data at 7 TeV on the density of charged particles, dN/dη

η η ηdφ φ φ φ, with pT > 0.5 GeV/c and |η η η η| < 2 for Drell- Yan production as a function of PT(Z) for the “toward”, “away”, and “transverse” regions compared with PYTHIA Tune DW. CDF: Proton-Antiproton Collisions at 1.96 GeV Lepton Cuts: pT > 20 GeV |η η η η| < 1.0 Mass Cut: 70 < M(lepton-pair) < 110 GeV Charged Particles: pT > 0.5 GeV/c |η η η η| < 1.0 CMS: Proton-Proton Collisions at 7 GeV Lepton Cuts: pT > 20 GeV |η η η η| < 2.4 Mass Cut: 60 < M(lepton-pair) < 120 GeV Charged Particles: pT > 0.5 GeV/c |η η η η| < 2.0

CMS

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 33

Z-Boson Direction ∆φ ∆φ ∆φ ∆φ

Charged Particle Density Charged Particle Density

• CDF data at 1.96 TeV on the density of charged particles, dN/dη

η η ηdφ φ φ φ, with pT > 0.5 GeV/c and |η η η η| < 1 for Drell-Yan production as a function of PT(Z) for the “toward”, “away”, and “transverse” regions compared with PYTHIA Tune DW.

Z-Boson Direction ∆φ ∆φ ∆φ ∆φ

Proton Proton

High PT Z-Boson Production

Z-boson

Charged Particle Density: dN/dη η η ηdφ φ φ φ

1 2 3 20 40 60 80 100

PT(lepton-pair) GeV/c

Average Charged Density

CMS Preliminary

data corrected pyDW generator level

Charged Particles (|η η η η|<2.0, PT>0.5 GeV/c) excluding the lepton-pair "Away" "Transverse" "Toward" Drell-Yan Production 60 < M(pair) < 120 GeV

7 TeV

Proton AntiProton

High PT Z-Boson Production

Z-boson

Charged Particle Density: dN/dη η η ηdφ φ φ φ

1 2 3 10 20 30 40 50 60 70 80 90 100

PT(lepton-pair) GeV/c

Average Charged Density

CDF Run 2

data corrected pyDW generator level

Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) excluding the lepton-pair "Away" "Transverse" "Toward" Drell-Yan Production 70 < M(pair) < 110 GeV

1.96 TeV

• CMS data at 7 TeV on the density of charged particles, dN/dη

η η ηdφ φ φ φ, with pT > 0.5 GeV/c and |η η η η| < 2 for Drell- Yan production as a function of PT(Z) for the “toward”, “away”, and “transverse” regions compared with PYTHIA Tune DW. CDF: Proton-Antiproton Collisions at 1.96 GeV Lepton Cuts: pT > 20 GeV |η η η η| < 1.0 Mass Cut: 70 < M(lepton-pair) < 110 GeV Charged Particles: pT > 0.5 GeV/c |η η η η| < 1.0 CMS: Proton-Proton Collisions at 7 GeV Lepton Cuts: pT > 20 GeV |η η η η| < 2.4 Mass Cut: 60 < M(lepton-pair) < 120 GeV Charged Particles: pT > 0.5 GeV/c |η η η η| < 2.0

"Toward" Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.4 0.8 1.2 20 40 60 80 100

PT(lepton-pair) GeV/c

Charged Particle Density

Drell-Yan Production

Charged Particles (PT>0.5 GeV/c)

CDF 1.96 TeV CMS 7 TeV RDF Preliminary

data corrected pyDW generator level

CMS

Large increase in the UE in going from 1.96 TeV to 7 TeV as predicted by PYTHIA Tune DW!

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 34

Z-Boson Direction ∆φ ∆φ ∆φ ∆φ

Charged Charged PTsum PTsum Density Density

Z-Boson Direction ∆φ ∆φ ∆φ ∆φ

Proton Proton

High PT Z-Boson Production

Z-boson

Proton AntiProton

High PT Z-Boson Production

Z-boson

Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

0.1 1.0 10.0 20 40 60 80 100

PT(lepton-pair) GeV/c

Charged PTsum Density (GeV/c)

CDF Run 2

data corrected pyDW generator level

Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) excluding the lepton-pair "Away" "Transverse" "Toward" Drell-Yan Production 70 < M(pair) < 110 GeV

1.96 TeV

Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

0.1 1.0 10.0 20 40 60 80 100

PT(lepton-pair) GeV/c

Charged PTsum Density (GeV/c)

CMS Preliminary

data corrected pyDW generator level

Charged Particles (|η η η η|<2.0, PT>0.5 GeV/c) excluding the lepton-pair "Away" "Transverse" "Toward" Drell-Yan Production 60 < M(pair) < 120 GeV

7 TeV

• CDF data at 1.96 TeV on the charged PTsum density, dPT/dη

η η ηdφ φ φ φ, with pT > 0.5 GeV/c and |η η η η| < 1 for Drell- Yan production as a function of PT(Z) for the “toward”, “away”, and “transverse” regions compared with PYTHIA Tune DW.

• CMS data at 7 TeV on the charged PTsum density, dPT/dη

η η ηdφ φ φ φ, with pT > 0.5 GeV/c and |η η η η| < 1 for Drell-Yan production as a function of PT(Z) for the “toward”, “away”, and “transverse” regions compared with PYTHIA Tune DW.

CMS

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 35

Z-Boson Direction ∆φ ∆φ ∆φ ∆φ

Charged Charged PTsum PTsum Density Density

Z-Boson Direction ∆φ ∆φ ∆φ ∆φ

Proton Proton

High PT Z-Boson Production

Z-boson

Proton AntiProton

High PT Z-Boson Production

Z-boson

Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

0.1 1.0 10.0 20 40 60 80 100

PT(lepton-pair) GeV/c

Charged PTsum Density (GeV/c)

CDF Run 2

data corrected pyDW generator level

Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) excluding the lepton-pair "Away" "Transverse" "Toward" Drell-Yan Production 70 < M(pair) < 110 GeV

1.96 TeV

Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

0.1 1.0 10.0 20 40 60 80 100

PT(lepton-pair) GeV/c

Charged PTsum Density (GeV/c)

CMS Preliminary

data corrected pyDW generator level

Charged Particles (|η η η η|<2.0, PT>0.5 GeV/c) excluding the lepton-pair "Away" "Transverse" "Toward" Drell-Yan Production 60 < M(pair) < 120 GeV

7 TeV

"Toward" Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

0.0 0.5 1.0 1.5 20 40 60 80 100

PT(lepton-pair) GeV/c

Charged PTsum Density (GeV/c)

Drell-Yan Production

Charged Particles (PT>0.5 GeV/c)

CDF 1.96 TeV CMS 7 TeV RDF Preliminary

data corrected pyDW generator level

• CDF data at 1.96 TeV on the charged PTsum density, dPT/dη

η η ηdφ φ φ φ, with pT > 0.5 GeV/c and |η η η η| < 1 for Drell- Yan production as a function of PT(Z) for the “toward”, “away”, and “transverse” regions compared with PYTHIA Tune DW.

• CMS data at 7 TeV on the charged PTsum density, dPT/dη

η η ηdφ φ φ φ, with pT > 0.5 GeV/c and |η η η η| < 1 for Drell-Yan production as a function of PT(Z) for the “toward”, “away”, and “transverse” regions compared with PYTHIA Tune DW.

CMS

Large increase in the UE in going from 1.96 TeV to 7 TeV as predicted by PYTHIA Tune DW!

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 36

PYTHIA Tune DW PYTHIA Tune DW

Charged Particle Density: dN/dη η η ηdφ φ φ φ

1 2 3 20 40 60 80 100

PT(lepton-pair) GeV/c

Average Charged Density

CMS Preliminary

data corrected pyDW generator level

Charged Particles (|η η η η|<2.0, PT>0.5 GeV/c) excluding the lepton-pair "Away" "Transverse" "Toward" Drell-Yan Production 60 < M(pair) < 120 GeV

7 TeV

"Toward" Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.4 0.8 1.2 20 40 60 80 100

PT(lepton-pair) GeV/c

Charged Particle Density

Drell-Yan Production

Charged Particles (PT>0.5 GeV/c)

CDF 1.96 TeV CMS 7 TeV RDF Preliminary

data corrected pyDW generator level

CMS

"Transverse" Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.5 1.0 1.5 20 40 60 80 100

PT(chgjet#1 or jet#1) GeV/c

Charged Particle Density

CDF 1.96 TeV

Charged Particles (PT>0.5 GeV/c)

CMS 7 TeV CMS 900 GeV RDF Preliminary

data corrected pyDW generator level

"Transverse" Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.5 1.0 1.5 50 100 150 200 250 300

PT(chgjet#1 or jet#1) GeV/c

Charged Particle Density

CDF 1.96 TeV

Charged Particles (PT>0.5 GeV/c)

CMS 7 TeV CMS 900 GeV RDF Preliminary

data corrected pyDW generator level

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 37

PYTHIA Tune DW PYTHIA Tune DW

Charged Particle Density: dN/dη η η ηdφ φ φ φ

1 2 3 20 40 60 80 100

PT(lepton-pair) GeV/c

Average Charged Density

CMS Preliminary

data corrected pyDW generator level

Charged Particles (|η η η η|<2.0, PT>0.5 GeV/c) excluding the lepton-pair "Away" "Transverse" "Toward" Drell-Yan Production 60 < M(pair) < 120 GeV

7 TeV

"Toward" Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.4 0.8 1.2 20 40 60 80 100

PT(lepton-pair) GeV/c

Charged Particle Density

Drell-Yan Production

Charged Particles (PT>0.5 GeV/c)

CDF 1.96 TeV CMS 7 TeV RDF Preliminary

data corrected pyDW generator level

CMS

"Transverse" Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.5 1.0 1.5 20 40 60 80 100

PT(chgjet#1 or jet#1) GeV/c

Charged Particle Density

CDF 1.96 TeV

Charged Particles (PT>0.5 GeV/c)

CMS 7 TeV CMS 900 GeV RDF Preliminary

data corrected pyDW generator level

"Transverse" Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.5 1.0 1.5 50 100 150 200 250 300

PT(chgjet#1 or jet#1) GeV/c

Charged Particle Density

CDF 1.96 TeV

Charged Particles (PT>0.5 GeV/c)

CMS 7 TeV CMS 900 GeV RDF Preliminary

data corrected pyDW generator level

Overall PYTHIA Tune DW is in amazingly good agreement with the Tevatron Jet production and Drell-Yan data and did a very good job in predicting the LHC Jet production and Drell-Yan data! (although not perfect)

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 38

PYTHIA Tune Z1 PYTHIA Tune Z1

Proton Proton

PT(hard)

I believe that it is time to move to PYTHIA

6.4 (pT-ordered parton showers and new MPI model)!

Tune Z1: I started with the parameters of

ATLAS Tune AMBT1, but I changed LO* to CTEQ5L and I varied PARP(82) and PARP(90) to get a very good fit of the CMS UE data at 900 GeV and 7 TeV. UE&MB@CMS UE&MB@CMS

All my previous tunes (A, DW, DWT, D6,

D6T, CW, X1, and X2) were PYTHIA 6.4 tunes using the old Q2-ordered parton showers and the old MPI model (really 6.2 tunes)!

PARP(90) Color Connections PARP(82) Diffraction

The ATLAS Tune AMBT1 was designed to fit the inelastic data for Nchg ≥ 6 and to fit the PTmax UE data with PTmax > 10 GeV/c. Tune AMBT1 is primarily a min-bias tune, while Tune Z1 is a UE tune!

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 39

PYTHIA Tune Z1 PYTHIA Tune Z1

0.1 0.1 PARP(80) – Probability colored parton from BBR 6 6 MSTP(95) – strategy for color reconnection 1800.0 1800.0 PARP(89) – Reference energy, E0 1 1 MSTP(91) – Gaussian primordial kT 4 4 MSTP(82) – Double gaussion matter distribution 21 21 MSTP(81) – MPI, ISR, FSR, BBR model 10.0 10.0 PARP(93) – primordial kT-max 1.025 1.025 PARP(62) – ISR Cut-off 0.651 0.651 PARP(84) – Core of matter overlap 0.356 0.356 PARP(83) – Matter fraction in core 0.538 0.538 PARP(78) – CR Strength 1.016 1.016 PARP(77) – CR Suppression 0.25 0.275 PARP(90) – MPI Energy Extrapolation 2.292 1.932 PARP(82) – MPI Cut-off LO* Tune AMBT1 (ATLAS) CTEQ5L Parton Distribution Function Tune Z1 (R. Field CMS) Parameter

Parameters not shown are the PYTHIA 6.4 defaults!

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 40

CMS UE Data CMS UE Data

• CMS preliminary data at 900 GeV and 7

TeV on the “transverse” charged PTsum density, dPT/dη η η ηdφ φ φ φ, as defined by the leading charged particle jet (chgjet#1) for charged particles with pT > 0.5 GeV/c and |η η η η| < 2.0. The data are corrected and compared with PYTHIA Tune Z1 at the generator level.

• CMS preliminary data at 900 GeV and 7

TeV on the “transverse” charged particle density, dN/dη η η ηdφ φ φ φ, as defined by the leading charged particle jet (chgjet#1) for charged particles with pT > 0.5 GeV/c and |η η η η| < 2.0. The data are corrected and compared with PYTHIA Tune Z1 at the generator level.

CMS

"Transverse" Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.4 0.8 1.2 1.6 10 20 30 40 50 60 70 80 90 100

PT(chgjet#1) GeV/c

Charged Particle Density

CMS Preliminary

data corrected Tune Z1 generator level

900 GeV 7 TeV

Charged Particles (|η η η η|<2.0, PT>0.5 GeV/c)

"Transverse" Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

0.0 0.4 0.8 1.2 1.6 2.0 10 20 30 40 50 60 70 80 90 100

PT(chgjet#1) GeV/c

PTsum Density (GeV/c)

Charged Particles (|η η η η|<2.0, PT>0.5 GeV/c)

CMS Preliminary

data corrected Tune Z1 generator level

900 GeV 7 TeV

Tune Z1

Very nice agreement!

CMS corrected data! CMS corrected data!

CMS

Tune Z1

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 41

ATLAS UE Data ATLAS UE Data

• ATLAS published data at 900 GeV and 7

TeV on the “transverse” charged PTsum density, dPT/dη η η ηdφ φ φ φ, as defined by the leading charged particle (PTmax) for charged particles with pT > 0.5 GeV/c and |η η η η| < 2.5. The data are corrected and compared with PYTHIA Tune Z1 at the generrator level.

• ATLAS published data at 900 GeV and 7

TeV on the “transverse” charged particle density, dN/dη η η ηdφ φ φ φ, as defined by the leading charged particle (PTmax) for charged particles with pT > 0.5 GeV/c and |η η η η| < 2.5. The data are corrected and compared with PYTHIA Tune Z1 at the generator level.

ATLAS ATLAS

Tune Z1 Tune Z1

ATLAS publication – arXiv:1012.0791 December 3, 2010

"Transverse" Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.4 0.8 1.2 5 10 15 20 25

PTmax (GeV/c)

"Transverse" Charged Density

Charged Particles (|η η η η|<2.5, PT>0.5 GeV/c)

RDF Preliminary

ATLAS corrected data Tune Z1 generator level

900 GeV 7 TeV

"Transverse" Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

0.0 0.5 1.0 1.5 5 10 15 20 25

PTmax (GeV/c)

PTsum Density (GeV/c)

Charged Particles (|η η η η|<2.5, PT>0.5 GeV/c)

RDF Preliminary

ATLAS corrected data Tune Z1 generator level

900 GeV 7 TeV

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 42

CMS CMS-

• ATLAS UE Data

ATLAS UE Data

• CMS preliminary data at 7 TeV on the “transverse” charged particle density, dN/dη

η η ηdφ φ φ φ, as defined by the leading charged particle jet (chgjet#1) for charged particles with pT > 0.5 GeV/c and |η η η η| < 2.0 together with the ATLAS published data at 7 TeV on the “transverse” charged particle density, dN/dη η η ηdφ φ φ φ, as defined by the leading charged particle (PTmax) for charged particles with pT > 0.5 GeV/c and |η η η η| < 2.5 The data are corrected and compared with PYTHIA Tune Z1 at the generator level.

"Transverse" Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.4 0.8 1.2 1.6 5 10 15 20 25 30

PTmax or PT(chgjet#1) (GeV/c)

Charged Particle Density

7 TeV

Charged Particles (PT > 0.5 GeV/c) CMS (red) ATLAS (blue)

RDF Preliminary

data corrected Tune Z1 generator level

"Transverse" Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.4 0.8 1.2 1.6 10 20 30 40 50 60 70 80 90 100

PTmax or PT(chgjet#1) (GeV/c)

Charged Particle Density

RDF Preliminary

data corrected Tune Z1 generator level

7 TeV

Charged Particles (PT > 0.5 GeV/c) CMS (red) ATLAS (blue)

Amazing agreement!

Tune Z1

CMS: Chgjet#1 ATLAS: PTmax

Tune Z1

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 43

Jet Radius Dependence Jet Radius Dependence

• The charged particle density in the “transverse” region as defined by the leading charged

particle jet from PYTHIA Tune Z1. The charged particles are in the region pT > 0.5 GeV/c and |η η η η| < 2.5. Charged particle jets are constructed using the Anti-KT algorithm with d = 0.2, 0.5, and 1.0 from charged particles in the region pT > 0.5 GeV/c and |η η η η| < 2.5, however, the leading charged particle jet is required to have |η η η η(chgjet#1)| < 1.5.

The UE activity is higher for large jet radius!

"Transverse" Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.5 1.0 1.5 10 20 30 40 50 60 70 80 90 100

PT(chgjet#1) GeV/c

Charged Particle Density

Charged Particles (|η η η η|<2.5, PT>0.5 GeV/c) Chgjet#1 (|η η η η|<1.5)

7 TeV RDF Preliminary

pyZ1 generator level

d = 0.5 d = 0.2 d = 1.0

Tune Z1

It appears that large jet radius “biases” the UE to be more active!

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 44

PYTHIA Tune Z1 PYTHIA Tune Z1

• ATLAS preliminary data at 7 TeV on the

“transverse” charged PTsum density, dPT/dη η η ηdφ φ φ φ, as defined by the leading charged particle (PTmax) for charged particles with pT > 0.5 GeV/c and |η η η η| < 2.5. The data are corrected and compared with PYTHIA Tune Z1 at the generator level. Also shows the prediction of Tune Z1 for the “transverse” charged particle density with pT > 0.1 GeV/c and |η η η η| < 2.5.

• ATLAS preliminary data at 7 TeV on the

“transverse” charged particle density, dN/dη η η ηdφ φ φ φ, as defined by the leading charged particle (PTmax) for charged particles with pT > 0.5 GeV/c and |η η η η| < 2.5. The data are corrected and compared with PYTHIA Tune Z1 at the generator level. Also shows the prediction of Tune Z1 for the “transverse” charged particle density with pT > 0.1 GeV/c and |η η η η| < 2.5.

"Transverse" Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.5 1.0 1.5 2.0 2.5 2 4 6 8 10 12 14 16 18 20

PTmax (GeV/c)

"Transverse" Charged Density

RDF Preliminary

ATLAS corrected data Tune Z1 generator level

7 TeV

Charged Particles (|η η η η|<2.5) PT > 0.1 GeV/c PT > 0.5 GeV/c

"Transverse" Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

0.0 0.5 1.0 1.5 2.0 2.5 2 4 6 8 10 12 14 16 18 20

PTmax (GeV/c)

"Transverse" PTsum Density

RDF Preliminary

ATLAS corrected data Tune Z1 generator level

7 TeV

PT > 0.1 GeV/c PT > 0.5 GeV/c Charged Particles (|η η η η|<2.5)

Tune Z1

ATLAS

Tune Z1

ATLAS

Factor of 2 increase!

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 45

PYTHIA Tune Z1 PYTHIA Tune Z1

• ATLAS preliminary data at 7 TeV on the

“transverse” charged PTsum density, dPT/dη η η ηdφ φ φ φ, as defined by the leading charged particle (PTmax) for charged particles with pT > 0.5 GeV/c and |η η η η| < 2.5. The data are corrected and compared with PYTHIA Tune Z1 at the generator level. Also shows the prediction of Tune Z1 for the “transverse” charged particle density with pT > 0.1 GeV/c and |η η η η| < 2.5.

• ATLAS preliminary data at 7 TeV on the

“transverse” charged particle density, dN/dη η η ηdφ φ φ φ, as defined by the leading charged particle (PTmax) for charged particles with pT > 0.5 GeV/c and |η η η η| < 2.5. The data are corrected and compared with PYTHIA Tune Z1 at the generator level. Also shows the prediction of Tune Z1 for the “transverse” charged particle density with pT > 0.1 GeV/c and |η η η η| < 2.5.

"Transverse" Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.5 1.0 1.5 2.0 2.5 2 4 6 8 10 12 14 16 18 20

PTmax (GeV/c)

"Transverse" Charged Density

RDF Preliminary

ATLAS corrected data Tune Z1 generator level

7 TeV

Charged Particles (|η η η η|<2.5) PT > 0.1 GeV/c PT > 0.5 GeV/c

"Transverse" Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

0.0 0.5 1.0 1.5 2.0 2.5 2 4 6 8 10 12 14 16 18 20

PTmax (GeV/c)

"Transverse" PTsum Density

RDF Preliminary

ATLAS corrected data Tune Z1 generator level

7 TeV

PT > 0.1 GeV/c PT > 0.5 GeV/c Charged Particles (|η η η η|<2.5)

Tune Z1

ATLAS

Tune Z1

ATLAS

Factor of 2 increase!

"Transverse" Ratio: PT > 0.1 and > 0.5 GeV/c

0.0 1.0 2.0 3.0 4.0 2 4 6 8 10 12 14 16 18 20

PTmax (GeV/c)

"Transverse" Ratio 0.1/0.5

RDF Preliminary

generator level Tune Z1 (solid) Tune DW (dashed)

7 TeV

Charged Particles (|η η η η|<2.5) Charge Particle Density Charge PTsum Density

Rick Field MPI@LHC 2010 Glasgow, Scotland December 2, 2010

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 46

PYTHIA Tune Z1 PYTHIA Tune Z1

• ATLAS preliminary data at 7 TeV on the

“transverse” charged PTsum density, dPT/dη η η ηdφ φ φ φ, as defined by the leading charged particle (PTmax) for charged particles with pT > 0.5 GeV/c and pT > 0.1 GeV/c (|η η η η| < 2.5). The data are corrected and compared with PYTHIA Tune Z1 at the generator level.

• ATLAS preliminary data at 7 TeV on the

“transverse” charged particle density, dN/dη η η ηdφ φ φ φ, as defined by the leading charged particle (PTmax) for charged particles with pT > 0.5 GeV/c and pT > 0.1 GeV/c (|η η η η| < 2.5). The data are corrected and compared with PYTHIA Tune Z1 at the generator level.

"Transverse" Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.5 1.0 1.5 2.0 2.5 2 4 6 8 10 12 14 16 18 20

PTmax (GeV/c)

"Transverse" Charged Density

RDF Preliminary

ATLAS corrected data Tune Z1 generator level

7 TeV

Charged Particles (|η η η η|<2.5) PT > 0.1 GeV/c PT > 0.5 GeV/c

"Transverse" Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

0.0 0.5 1.0 1.5 2.0 2.5 2 4 6 8 10 12 14 16 18 20

PTmax (GeV/c)

"Transverse" PTsum Density

RDF Preliminary

ATLAS corrected data Tune Z1 generator level

7 TeV

PT > 0.1 GeV/c PT > 0.5 GeV/c Charged Particles (|η η η η|<2.5)

"Transverse" Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.5 1.0 1.5 2.0 2.5 2 4 6 8 10 12 14 16 18 20

PTmax (GeV/c)

"Transverse" Charged Density RDF Preliminary

7 TeV

PT > 0.1 GeV/c PT > 0.5 GeV/c Charged Particles (|η η η η|<2.5)

Tune Z1

ATLAS

"Transverse" Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

0.0 0.5 1.0 1.5 2.0 2.5 2 4 6 8 10 12 14 16 18 20

PTmax (GeV/c)

PTsum Density (GeV/c) RDF Preliminary

7 TeV

PT > 0.1 GeV/c PT > 0.5 GeV/c Charged Particles (|η η η η|<2.5)

Tune Z1

ATLAS

ATLAS publication – arXiv:1012.0791 December 3, 2010

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 47

PYTHIA Tune Z1 PYTHIA Tune Z1

• ATLAS preliminary data at 7 TeV on the

“transverse” charged PTsum density, dPT/dη η η ηdφ φ φ φ, as defined by the leading charged particle (PTmax) for charged particles with pT > 0.5 GeV/c and pT > 0.1 GeV/c (|η η η η| < 2.5). The data are corrected and compared with PYTHIA Tune Z1 at the generator level.

• ATLAS preliminary data at 7 TeV on the

“transverse” charged particle density, dN/dη η η ηdφ φ φ φ, as defined by the leading charged particle (PTmax) for charged particles with pT > 0.5 GeV/c and pT > 0.1 GeV/c (|η η η η| < 2.5). The data are corrected and compared with PYTHIA Tune Z1 at the generator level.

"Transverse" Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.5 1.0 1.5 2.0 2.5 2 4 6 8 10 12 14 16 18 20

PTmax (GeV/c)

"Transverse" Charged Density

RDF Preliminary

ATLAS corrected data Tune Z1 generator level

7 TeV

Charged Particles (|η η η η|<2.5) PT > 0.1 GeV/c PT > 0.5 GeV/c

"Transverse" Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

0.0 0.5 1.0 1.5 2.0 2.5 2 4 6 8 10 12 14 16 18 20

PTmax (GeV/c)

"Transverse" PTsum Density

RDF Preliminary

ATLAS corrected data Tune Z1 generator level

7 TeV

PT > 0.1 GeV/c PT > 0.5 GeV/c Charged Particles (|η η η η|<2.5)

"Transverse" Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.5 1.0 1.5 2.0 2.5 2 4 6 8 10 12 14 16 18 20

PTmax (GeV/c)

"Transverse" Charged Density RDF Preliminary

7 TeV

PT > 0.1 GeV/c PT > 0.5 GeV/c Charged Particles (|η η η η|<2.5)

Tune Z1

ATLAS

"Transverse" Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

0.0 0.5 1.0 1.5 2.0 2.5 2 4 6 8 10 12 14 16 18 20

PTmax (GeV/c)

PTsum Density (GeV/c) RDF Preliminary

7 TeV

PT > 0.1 GeV/c PT > 0.5 GeV/c Charged Particles (|η η η η|<2.5)

Tune Z1

ATLAS

ATLAS publication – arXiv:1012.0791 December 3, 2010

"Transverse" Ratio: PT > 0.1 and > 0.5 GeV/c

0.0 1.0 2.0 3.0 4.0 2 4 6 8 10 12 14 16 18 20

PTmax (GeV/c)

"Transverse" Ratio 0.1/0.5

7 TeV

Charged Particles (|η η η η|<2.5)

RDF Preliminary

ATLAS corrected data Tune Z1 generator level

Charge Particle Density Charge PTsum Density

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 48

ALICE UE Data ALICE UE Data

• ALICE preliminary data at 900 GeV and 7

TeV on the “transverse” charged PTsum density, dPT/dη η η ηdφ φ φ φ, as defined by the leading charged particle (PTmax) for charged particles with pT > 0.5 GeV/c and |η η η η| < 0.8. The data are corrected and compared with PYTHIA Tune Z1 at the generrator level.

• ALICE preliminary data at 900 GeV and 7

TeV on the “transverse” charged particle density, dN/dη η η ηdφ φ φ φ, as defined by the leading charged particle (PTmax) for charged particles with pT > 0.5 GeV/c and |η η η η| < 0.8. The data are corrected and compared with PYTHIA Tune Z1 at the generator level.

ALICE UE Data: Talk by S. Vallero MPI@LHC 2010 Glasgow, Scotland November 30, 2010

"Transverse" Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.4 0.8 1.2 5 10 15 20 25

PTmax (GeV/c)

"Transverse" Charged Density

RDF Preliminary

ALICE corrected data Tune Z1 generator level

Charged Particles (|η η η η|<0.8, PT>0.5 GeV/c)

900 GeV 7 TeV

"Transverse" Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

0.0 0.5 1.0 1.5 5 10 15 20 25

PTmax (GeV/c)

PTsum Density (GeV/c)

RDF Preliminary

ALICE corrected data Tune Z1 generator level

Charged Particles (|η η η η|<0.8, PT>0.5 GeV/c)

900 GeV 7 TeV

ALICE

Tune Z1

ALICE

Tune Z1

I read the points off with a ruler!

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 49

ATLAS UE Data ATLAS UE Data

• ATLAS preliminary data at 900 GeV and 7

TeV on the “transverse” charged PTsum density, dPT/dη η η ηdφ φ φ φ, as defined by the leading charged particle (PTmax) for charged particles with pT > 0.5 GeV/c and |η η η η| < 0.8. The data are corrected and compared with PYTHIA Tune Z1 at the generrator level.

• ATLAS preliminary data at 900 GeV and 7

TeV on the “transverse” charged particle density, dN/dη η η ηdφ φ φ φ, as defined by the leading charged particle (PTmax) for charged particles with pT > 0.5 GeV/c and |η η η η| < 0.8. The data are corrected and compared with PYTHIA Tune Z1 at the generator level.

ATLAS-CONF-2011-009 February 21, 2011

"Transverse" Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.4 0.8 1.2 5 10 15 20 25

PTmax (GeV/c)

"Transverse" Charged Density

RDF Preliminary

ATLAS corrected data Tune Z1 generator level

Charged Particles (|η η η η|<0.8, PT>0.5 GeV/c)

900 GeV 7 TeV

ATLAS

Tune Z1

"Transverse" Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

0.0 0.5 1.0 1.5 5 10 15 20 25

PTmax (GeV/c)

PTsum Density (GeV/c)

Charged Particles (|η η η η| < 0.8, PT > 0.5 GeV/c)

RDF Preliminary

ATLAS corrected data Tune Z1 generator level

900 GeV 7 TeV

ATLAS

Tune Z1

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 50

MB&UE Working Group

CMS ATLAS

MB & UE Common Plots

The LPCC MB&UE Working Group has suggested

several MB&UE “Common Plots” the all the LHC groups can produce and compare with each other.

Proton Proton

“Minimum Bias” Collisions

Proton Proton

PT(hard)

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 51

ALICE ALICE-

• ATLAS UE

ATLAS UE

• ATLAS preliminary data at 900 GeV and 7

TeV on the “transverse” charged particle density, dN/dη η η ηdφ φ φ φ, as defined by the leading charged particle (PTmax) for charged particles with pT > 0.5 GeV/c and |η η η η| < 0.8. The data are corrected and compared with PYTHIA Tune Z1 at the generrator level.

• ALICE preliminary data at 900 GeV and 7

TeV on the “transverse” charged particle density, dN/dη η η ηdφ φ φ φ, as defined by the leading charged particle (PTmax) for charged particles with pT > 0.5 GeV/c and |η η η η| < 0.8. The data are corrected and compared with PYTHIA Tune Z1 at the generator level.

"Transverse" Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.4 0.8 1.2 5 10 15 20 25

PTmax (GeV/c)

"Transverse" Charged Density

RDF Preliminary

ALICE corrected data Tune Z1 generator level

Charged Particles (|η η η η|<0.8, PT>0.5 GeV/c)

900 GeV 7 TeV

ALICE

Tune Z1

"Transverse" Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.4 0.8 1.2 5 10 15 20 25

PTmax (GeV/c)

"Transverse" Charged Density

RDF Preliminary

ATLAS corrected data Tune Z1 generator level

Charged Particles (|η η η η|<0.8, PT>0.5 GeV/c)

900 GeV 7 TeV

ATLAS

Tune Z1

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 52

ALICE ALICE-

• ATLAS UE

ATLAS UE

• ATLAS preliminary data at 900 GeV and 7

TeV on the “transverse” charged particle density, dN/dη η η ηdφ φ φ φ, as defined by the leading charged particle (PTmax) for charged particles with pT > 0.5 GeV/c and |η η η η| < 0.8. The data are corrected and compared with PYTHIA Tune Z1 at the generrator level.

• ALICE preliminary data at 900 GeV and 7

TeV on the “transverse” charged particle density, dN/dη η η ηdφ φ φ φ, as defined by the leading charged particle (PTmax) for charged particles with pT > 0.5 GeV/c and |η η η η| < 0.8. The data are corrected and compared with PYTHIA Tune Z1 at the generator level.

ALICE

Tune Z1

"Transverse" Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

0.0 0.5 1.0 1.5 5 10 15 20 25

PTmax (GeV/c)

PTsum Density (GeV/c)

RDF Preliminary

ALICE corrected data Tune Z1 generator level

Charged Particles (|η η η η|<0.8, PT>0.5 GeV/c)

900 GeV 7 TeV

"Transverse" Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

0.0 0.5 1.0 1.5 5 10 15 20 25

PTmax (GeV/c)

PTsum Density (GeV/c)

Charged Particles (|η η η η| < 0.8, PT > 0.5 GeV/c)

RDF Preliminary

ATLAS corrected data Tune Z1 generator level

900 GeV 7 TeV

ATLAS

Tune Z1

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 53

Tevatron Tevatron Energy Scan Energy Scan

Over the past few days CDF has collected more than 10M “min-bias” events at several center-of-mass energies!

Proton AntiProton 1 mile CDF

Proton AntiProton

1.96 TeV 300 GeV 12M MB Events 900 GeV 17M MB Events

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 54

PYTHIA Tune Z1 PYTHIA Tune Z1

• CMS data at 900 GeV on the “transverse”

charged particle density, dN/dη η η ηdφ φ φ φ, as defined by the leading charged particle jet (chgjet#1) for charged particles with pT > 0.5 GeV/c and |η η η η| < 2.0. The data are corrected and compared with PYTHIA Tune Z1 at the generator level.

"Transverse" Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.4 0.8 1.2 1.6 10 20 30 40 50 60 70 80 90 100

PT(chgjet#1) GeV/c

Charged Particle Density

CMS Preliminary

data corrected Tune Z1 generator level

900 GeV 7 TeV

Charged Particles (|η η η η|<2.0, PT>0.5 GeV/c)

"Transverse" Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.5 1.0 1.5 20 40 60 80 100

PT(chgjet#1 or jet#1) GeV/c

Charged Particle Density

CDF 1.96 TeV

Charged Particles (PT>0.5 GeV/c)

CMS 7 TeV CMS 900 GeV RDF Preliminary

data corrected pyZ1 generator level

"Transverse" Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.5 1.0 1.5 50 100 150 200 250 300

PT(chgjet#1 or jet#1) GeV/c

Charged Particle Density

CDF 1.96 TeV

Charged Particles (PT>0.5 GeV/c)

CMS 7 TeV CMS 900 GeV RDF Preliminary

data corrected pyZ1 generator level

Tune Z1

• CDF data at 1.96 TeV on the “transverse”

charged particle density, dN/dη η η ηdφ φ φ φ, as defined by the leading calorimeter jet (jet#1) for charged particles with pT > 0.5 GeV/c and |η η η η| < 1.0. The data are corrected and compared with PYTHIA Tune Z1 at the generator level.

Tune Z1

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 55

PYTHIA Tune Z1 PYTHIA Tune Z1

• CDF data at 1.96 TeV on the “transverse”

charged PTsum density, dPT/dη η η ηdφ φ φ φ, as defined by the leading calorimeter jet (jet#1) for charged particles with pT > 0.5 GeV/c and |η η η η| < 1.0. The data are corrected and compared with PYTHIA Tune Z1 at the generator level.

• CMS data at 900 GeV and 7 TeV on the

“transverse” charged PTsum density, dPT/dη η η ηdφ φ φ φ, as defined by the leading charged particle jet (chgjet#1) for charged particles with pT > 0.5 GeV/c and |η η η η| < 2.0. The data are corrected and compared with PYTHIA Tune Z1 at the generator level.

"Transverse" Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

0.0 0.4 0.8 1.2 1.6 2.0 10 20 30 40 50 60 70 80 90 100

PT(chgjet#1) GeV/c

PTsum Density (GeV/c)

Charged Particles (|η η η η|<2.0, PT>0.5 GeV/c)

CMS Preliminary

data corrected Tune Z1 generator level

900 GeV 7 TeV

"Transverse" Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

0.0 0.4 0.8 1.2 1.6 2.0 10 20 30 40 50 60 70 80 90 100

PT(chgjet#1 or jet#1) GeV/c

PTsum Density (GeV/c)

Charged Particles (PT>0.5 GeV/c)

CDF 1.96 TeV CMS 7 TeV CMS 900 GeV RDF Preliminary

data corrected pyZ1 generator level

"Transverse" Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

0.0 0.4 0.8 1.2 1.6 2.0 50 100 150 200 250 300

PT(chgjet#1 or jet#1) GeV/c

PTsum Density (GeV/c)

Charged Particles (PT>0.5 GeV/c)

CDF 1.96 TeV CMS 7 TeV CMS 900 GeV RDF Preliminary

data corrected pyZ1 generator level

Tune Z1 Tune Z1

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 56

Z-Boson Direction ∆φ ∆φ ∆φ ∆φ

PYTHIA Tune Z1 PYTHIA Tune Z1

Z-Boson Direction ∆φ ∆φ ∆φ ∆φ

Proton Proton

High PT Z-Boson Production

Z-boson

Proton AntiProton

High PT Z-Boson Production

Z-boson

Charged Particle Density: dN/dη η η ηdφ φ φ φ

1 2 3 20 40 60 80 100

PT(lepton-pair) GeV/c

Average Charged Density

CMS Preliminary

data corrected pyZ1 generator level

Charged Particles (|η η η η|<2.0, PT>0.5 GeV/c) excluding the lepton-pair "Away" "Transverse" "Toward" Drell-Yan Production 60 < M(pair) < 120 GeV

7 TeV

Charged Particle Density: dN/dη η η ηdφ φ φ φ

1 2 3 10 20 30 40 50 60 70 80 90 100

PT(lepton-pair) GeV/c

Average Charged Density

CDF Run 2

data corrected pyZ1 generator level

Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) excluding the lepton-pair "Away" "Transverse" "Toward" Drell-Yan Production 70 < M(pair) < 110 GeV

1.96 TeV

• CDF data at 1.96 TeV on the density of charged particles, dN/dη

η η ηdφ φ φ φ, with pT > 0.5 GeV/c and |η η η η| < 1 for Drell-Yan production as a function of PT(Z) for the “toward”, “away”, and “transverse” regions compared with PYTHIA Tune Z1.

• CMS data at 7 TeV on the density of charged particles, dN/dη

η η ηdφ φ φ φ, with pT > 0.5 GeV/c and |η η η η| < 2 for Drell- Yan production as a function of PT(Z) for the “toward”, “away”, and “transverse” regions compared with PYTHIA Tune Z1.

CMS

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 57

Z-Boson Direction ∆φ ∆φ ∆φ ∆φ

PYTHIA Tune Z1 PYTHIA Tune Z1

Z-Boson Direction ∆φ ∆φ ∆φ ∆φ

Proton Proton

High PT Z-Boson Production

Z-boson

Proton AntiProton

High PT Z-Boson Production

Z-boson

Charged Particle Density: dN/dη η η ηdφ φ φ φ

1 2 3 20 40 60 80 100

PT(lepton-pair) GeV/c

Average Charged Density

CMS Preliminary

data corrected pyZ1 generator level

Charged Particles (|η η η η|<2.0, PT>0.5 GeV/c) excluding the lepton-pair "Away" "Transverse" "Toward" Drell-Yan Production 60 < M(pair) < 120 GeV

7 TeV

Charged Particle Density: dN/dη η η ηdφ φ φ φ

1 2 3 10 20 30 40 50 60 70 80 90 100

PT(lepton-pair) GeV/c

Average Charged Density

CDF Run 2

data corrected pyZ1 generator level

Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) excluding the lepton-pair "Away" "Transverse" "Toward" Drell-Yan Production 70 < M(pair) < 110 GeV

1.96 TeV

• CDF data at 1.96 TeV on the density of charged particles, dN/dη

η η ηdφ φ φ φ, with pT > 0.5 GeV/c and |η η η η| < 1 for Drell-Yan production as a function of PT(Z) for the “toward”, “away”, and “transverse” regions compared with PYTHIA Tune Z1.

• CMS data at 7 TeV on the density of charged particles, dN/dη

η η ηdφ φ φ φ, with pT > 0.5 GeV/c and |η η η η| < 2 for Drell- Yan production as a function of PT(Z) for the “toward”, “away”, and “transverse” regions compared with PYTHIA Tune Z1.

"Toward" Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.4 0.8 1.2 20 40 60 80 100

PT(lepton-pair) GeV/c

Charged Particle Density

Drell-Yan Production

Charged Particles (PT>0.5 GeV/c)

CDF 1.96 TeV CMS 7 TeV RDF Preliminary

data corrected pyZ1 generator level

Tune Z1 describes the energy dependence fairly well!

CMS

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 58

Z-Boson Direction ∆φ ∆φ ∆φ ∆φ

PYTHIA Tune Z1 PYTHIA Tune Z1

Z-Boson Direction ∆φ ∆φ ∆φ ∆φ

Proton Proton

High PT Z-Boson Production

Z-boson

Proton AntiProton

High PT Z-Boson Production

Z-boson

• CDF data at 1.96 TeV on the charged PTsum density, dPT/dη

η η ηdφ φ φ φ, with pT > 0.5 GeV/c and |η η η η| < 1 for Drell- Yan production as a function of PT(Z) for the “toward”, “away”, and “transverse” regions compared with PYTHIA Tune Z1.

• CMS data at 7 TeV on the charged PTsum density, dPT/dη

η η ηdφ φ φ φ, with pT > 0.5 GeV/c and |η η η η| < 2 for Drell-Yan production as a function of PT(Z) for the “toward”, “away”, and “transverse” regions compared with PYTHIA Tune Z1.

Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

0.1 1.0 10.0 20 40 60 80 100

PT(lepton-pair) GeV/c

Charged PTsum Density (GeV/c)

CDF Run 2

data corrected pyZ1 generator level

Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) excluding the lepton-pair "Away" "Transverse" "Toward" Drell-Yan Production 70 < M(pair) < 110 GeV

1.96 TeV

Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

0.1 1.0 10.0 20 40 60 80 100

PT(lepton-pair) GeV/c

Charged PTsum Density (GeV/c)

CMS Preliminary

data corrected pyZ1 generator level

Charged Particles (|η η η η|<2.0, PT>0.5 GeV/c) excluding the lepton-pair "Away" "Transverse" "Toward" Drell-Yan Production 60 < M(pair) < 120 GeV

7 TeV

CMS

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 59

Z-Boson Direction ∆φ ∆φ ∆φ ∆φ

PYTHIA Tune Z1 PYTHIA Tune Z1

Z-Boson Direction ∆φ ∆φ ∆φ ∆φ

Proton Proton

High PT Z-Boson Production

Z-boson

Proton AntiProton

High PT Z-Boson Production

Z-boson

• CDF data at 1.96 TeV on the charged PTsum density, dPT/dη

η η ηdφ φ φ φ, with pT > 0.5 GeV/c and |η η η η| < 1 for Drell- Yan production as a function of PT(Z) for the “toward”, “away”, and “transverse” regions compared with PYTHIA Tune Z1.

• CMS data at 7 TeV on the charged PTsum density, dPT/dη

η η ηdφ φ φ φ, with pT > 0.5 GeV/c and |η η η η| < 2 for Drell-Yan production as a function of PT(Z) for the “toward”, “away”, and “transverse” regions compared with PYTHIA Tune Z1.

Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

0.1 1.0 10.0 20 40 60 80 100

PT(lepton-pair) GeV/c

Charged PTsum Density (GeV/c)

CDF Run 2

data corrected pyZ1 generator level

Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) excluding the lepton-pair "Away" "Transverse" "Toward" Drell-Yan Production 70 < M(pair) < 110 GeV

1.96 TeV

Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

0.1 1.0 10.0 20 40 60 80 100

PT(lepton-pair) GeV/c

Charged PTsum Density (GeV/c)

CMS Preliminary

data corrected pyZ1 generator level

Charged Particles (|η η η η|<2.0, PT>0.5 GeV/c) excluding the lepton-pair "Away" "Transverse" "Toward" Drell-Yan Production 60 < M(pair) < 120 GeV

7 TeV

"Toward" Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

0.0 0.5 1.0 1.5 20 40 60 80 100

PT(lepton-pair) GeV/c

Charged PTsum Density (GeV/c)

Drell-Yan Production

Charged Particles (PT>0.5 GeV/c)

CDF 1.96 TeV CMS 7 TeV RDF Preliminary

data corrected pyZ1 generator level

CMS

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 60

PYTHIA Tune Z1 PYTHIA Tune Z1

"Transverse" Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.5 1.0 1.5 20 40 60 80 100

PT(chgjet#1 or jet#1) GeV/c

Charged Particle Density

CDF 1.96 TeV

Charged Particles (PT>0.5 GeV/c)

CMS 7 TeV CMS 900 GeV RDF Preliminary

data corrected pyZ1 generator level

"Transverse" Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.4 0.8 1.2 20 40 60 80 100

PT(lepton-pair) GeV/c

Charged Particle Density

Drell-Yan Production

Charged Particles (PT>0.5 GeV/c)

CDF 1.96 TeV CMS 7 TeV RDF Preliminary

data corrected pyZ1 generator level

"Away" Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 1.0 2.0 3.0 20 40 60 80 100

PT(lepton-pair) GeV/c

Charged Particle Density

Drell-Yan Production

Charged Particles (PT>0.5 GeV/c)

CDF 1.96 TeV CMS 7 TeV RDF Preliminary

data corrected pyZ1 generator level

"Transverse" Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.4 0.8 1.2 1.6 10 20 30 40 50 60 70 80 90 100

PT(chgjet#1) or PT(lepton-pair) GeV/c

Charged Particle Density

CMS Preliminary

data corrected pyZ1 generator level

Charged Particles (|η η η η|<2.0, PT>0.5 GeV/c)

7 TeV

Chgjet Production Drell-Yan Production

Tune Z1 Tune Z1 Tune Z1 Tune Z1

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 61

PYTHIA Tune Z1 PYTHIA Tune Z1

"Transverse" Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

0.0 0.4 0.8 1.2 1.6 2.0 10 20 30 40 50 60 70 80 90 100

PT(chgjet#1 or jet#1) GeV/c

PTsum Density (GeV/c)

Charged Particles (PT>0.5 GeV/c)

CDF 1.96 TeV CMS 7 TeV CMS 900 GeV RDF Preliminary

data corrected pyZ1 generator level

"Transverse" Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

0.0 0.5 1.0 1.5 2.0 10 20 30 40 50 60 70 80 90 100

PT(lepton-pair) GeV/c

Charged PTsum Density (GeV/c)

Drell-Yan Production

Charged Particles (PT>0.5 GeV/c)

CDF 1.96 TeV CMS 7 TeV RDF Preliminary

data corrected pyZ1 generator level

"Away" Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

0.0 2.0 4.0 6.0 8.0 10.0 10 20 30 40 50 60 70 80 90 100

PT(lepton-pair) GeV/c

Charged PTsum Density (GeV/c)

Drell-Yan Production

Charged Particles (PT>0.5 GeV/c)

CDF 1.96 TeV CMS 7 TeV RDF Preliminary

data corrected pyZ1 generator level

"Transverse" Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

0.0 0.5 1.0 1.5 2.0 10 20 30 40 50 60 70 80 90 100

PT(chgjet#1) or PT(lepton-pair) GeV/c

Charged PTsum Density (GeV/c)

CMS Preliminary

data corrected pyZ1 generator level

Charged Particles (|η η η η|<2.0, PT>0.5 GeV/c)

7 TeV

Chgjet Production Drell-Yan Production

Tune Z1 Tune Z1 Tune Z1 Tune Z1

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 62

PYTHIA Tune Z1 PYTHIA Tune Z1

"Transverse" Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

0.0 0.4 0.8 1.2 1.6 2.0 10 20 30 40 50 60 70 80 90 100

PT(chgjet#1 or jet#1) GeV/c

PTsum Density (GeV/c)

Charged Particles (PT>0.5 GeV/c)

CDF 1.96 TeV CMS 7 TeV CMS 900 GeV RDF Preliminary

data corrected pyZ1 generator level

"Transverse" Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

0.0 0.5 1.0 1.5 2.0 10 20 30 40 50 60 70 80 90 100

PT(lepton-pair) GeV/c

Charged PTsum Density (GeV/c)

Drell-Yan Production

Charged Particles (PT>0.5 GeV/c)

CDF 1.96 TeV CMS 7 TeV RDF Preliminary

data corrected pyZ1 generator level

"Away" Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

0.0 2.0 4.0 6.0 8.0 10.0 10 20 30 40 50 60 70 80 90 100

PT(lepton-pair) GeV/c

Charged PTsum Density (GeV/c)

Drell-Yan Production

Charged Particles (PT>0.5 GeV/c)

CDF 1.96 TeV CMS 7 TeV RDF Preliminary

data corrected pyZ1 generator level

"Transverse" Charged PTsum Density: dPT/dη η η ηdφ φ φ φ

0.0 0.5 1.0 1.5 2.0 10 20 30 40 50 60 70 80 90 100

PT(chgjet#1) or PT(lepton-pair) GeV/c

Charged PTsum Density (GeV/c)

CMS Preliminary

data corrected pyZ1 generator level

Charged Particles (|η η η η|<2.0, PT>0.5 GeV/c)

7 TeV

Chgjet Production Drell-Yan Production

Tune Z1 Tune Z1 Tune Z1 Tune Z1

Overall amazingly good agreement with the LHC and Tevatron Jet production and Drell-Yan! (although not perfect yet) What about Min-Bias?

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 63

The Inelastic Non The Inelastic Non-

• Diffractive

Diffractive Cross Cross-

• Section

Section

Proton Proton

+

+

+ + …

“Semi-hard” parton- parton collision (pT < ≈2 GeV/c) Occasionally one of the parton-parton collisions is hard (pT > ≈2 GeV/c) Majority of “min- bias” events! Multiple-parton interactions (MPI)!

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 64

The The “ “Underlying Event Underlying Event” ”

Proton Proton

Select inelastic non-diffractive events that contain a hard scattering

+

+ + …

“Semi-hard” parton- parton collision (pT < ≈2 GeV/c) Hard parton-parton collisions is hard (pT > ≈2 GeV/c) The “underlying-event” (UE)! Multiple-parton interactions (MPI)! Given that you have one hard scattering it is more probable to have MPI! Hence, the UE has more activity than “min-bias”.

1/(pT)4→ 1/(pT

2+pT0 2)2

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 65

Model of Model of σ σ σ σ σ σ σ σND

ND

Proton Proton

+

+

+ + …

“Semi-hard” parton- parton collision (pT < ≈2 GeV/c) Allow leading hard scattering to go to zero pT with same cut-off as the MPI! Model of the inelastic non- diffractive cross section! Multiple-parton interactions (MPI)!

Proton Proton

1/(pT)4→ 1/(pT

2+pT0 2)2

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 66

UE Tunes UE Tunes

Proton Proton

+

+

+ + …

“Underlying Event” “Min-Bias” (ND) Fit the “underlying event” in a hard scattering process. Predict MB (ND)! 1/(pT)4→ 1/(pT

2+pT0 2)2

Allow primary hard-scattering to go to pT = 0 with same cut-off! Single Diffraction M Double Diffraction M1 M2

“Min-Bias” (add single & double diffraction) Predict MB (IN)!

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 67

LHC MB Predictions: 900 LHC MB Predictions: 900 GeV GeV

Proton Proton

“Minimum Bias” Collisions

Compares the 900 GeV ALICE data with PYTHIA Tune DW and Tune S320 Perugia 0. Tune DW uses the old Q2-ordered parton shower and the old MPI

• model. Tune S320 uses the new pT-ordered parton shower and the new MPI
• model. The numbers in parentheses are the average value of dN/dη

η η η for the region |η η η η| < 0.6.

Proton Proton

“Minimum Bias” Collisions

Charged Particle Density: dN/dη η η η

1 2 3 4 5

• 3.0
• 2.5
• 2.0
• 1.5
• 1.0
• 0.5

0.0 0.5 1.0 1.5 2.0 2.5 3.0

PseudoRapidity η η η η

Charged Particle Density

ALICE INEL UA5 INEL pyDW INEL (2.67) pyS320 INEL (2.70)

RDF Preliminary INEL = HC+DD+SD 900 GeV

Charged Particles (all pT)

Charged Particle Density: dN/dη η η η

1 2 3 4 5

• 3.0
• 2.5
• 2.0
• 1.5
• 1.0
• 0.5

0.0 0.5 1.0 1.5 2.0 2.5 3.0

PseudoRapidity η η η η

Charged Particle Density

UA5 ALICE pyDW_10mm (3.04) pyS320_10mm (3.09)

NSD = HC+DD 900 GeV RDF Preliminary

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 68

LHC MB Predictions: 900 LHC MB Predictions: 900 GeV GeV

Proton Proton

“Minimum Bias” Collisions

Compares the 900 GeV ALICE data with PYTHIA Tune DW and Tune S320 Perugia 0. Tune DW uses the old Q2-ordered parton shower and the old MPI

• model. Tune S320 uses the new pT-ordered parton shower and the new MPI
• model. The numbers in parentheses are the average value of dN/dη

η η η for the region |η η η η| < 0.6.

Proton Proton

“Minimum Bias” Collisions

Charged Particle Density: dN/dη η η η

1 2 3 4 5

• 3.0
• 2.5
• 2.0
• 1.5
• 1.0
• 0.5

0.0 0.5 1.0 1.5 2.0 2.5 3.0

PseudoRapidity η η η η

Charged Particle Density

ALICE INEL UA5 INEL pyDW INEL (2.67) pyS320 INEL (2.70)

RDF Preliminary INEL = HC+DD+SD 900 GeV

Charged Particles (all pT)

Charged Particle Density: dN/dη η η η

1 2 3 4 5

• 3.0
• 2.5
• 2.0
• 1.5
• 1.0
• 0.5

0.0 0.5 1.0 1.5 2.0 2.5 3.0

PseudoRapidity η η η η

Charged Particle Density

UA5 ALICE pyDW_10mm (3.04) pyS320_10mm (3.09)

NSD = HC+DD 900 GeV RDF Preliminary

Charged Particle Density: dN/dη η η η

1 2 3 4 5

• 3.0
• 2.5
• 2.0
• 1.5
• 1.0
• 0.5

0.0 0.5 1.0 1.5 2.0 2.5 3.0

PseudoRapidity η η η η

Charged Particle Density

ALICE INEL UA5 INEL pyDW times 1.11 (2.97) pyS320 times 1.11 (3.00)

RDF Preliminary INEL = HC+DD+SD 900 GeV

times 1.11 Charged Particles (all pT)

Off by 11%!

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 69

PYTHIA Tune DW PYTHIA Tune DW

Charged Particle Density: dN/dη η η η

1 2 3 4 5

• 2.0
• 1.5
• 1.0
• 0.5

0.0 0.5 1.0 1.5 2.0

PseudoRapidity η η η η

Charged Particle Density

900 GeV

pT > 0.15 GeV/c

RDF Preliminary

pT > 0.5 GeV/c pT > 1.0 GeV/c At Least 1 Charged Particle |η η η η| < 0.8

• ALICE inelastic data at 900 GeV on the dN/dη

η η η distribution for charged particles (pT > PTmin) for events with at least one charged particle with pT > PTmin and |η η η η| < 0.8 for PTmin = 0.15 GeV/c, 0.5 GeV/c, and 1.0 GeV/c compared with PYTHIA Tune DW at the generator level.

If one increases the pT the agreement improves! Tune DW

Proton Proton

“Minimum Bias” Collisions

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 70

PYTHIA Tune DW PYTHIA Tune DW

• ALICE inelastic data at 900 GeV on the dN/dη

η η η distribution for charged particles (pT > PTmin) for events with at least one charged particle with pT > PTmin and |η η η η| < 0.8 for PTmin = 0.15 GeV/c, 0.5 GeV/c, and 1.0 GeV/c compared with PYTHIA Tune Z1 at the generator level (dashed = ND, solid = INEL).

Charged Particle Density: dN/dη η η η

1 2 3 4 5

• 2.0
• 1.5
• 1.0
• 0.5

0.0 0.5 1.0 1.5 2.0

PseudoRapidity η η η η

Charged Particle Density

900 GeV

pT > 0.15 GeV/c

RDF Preliminary

pT > 0.5 GeV/c pT > 1.0 GeV/c dashed = ND solid = INEL At Least 1 Charged Particle |η η η η| < 0.8

Diffraction contributes less at harder scales! Tune DW

Proton Proton

“Minimum Bias” Collisions

Cannot trust PYTHIA 6.2 modeling of diffraction!

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 71

Charged Particle Density: dN/dη η η η

2 4 6 8

• 3.0
• 2.5
• 2.0
• 1.5
• 1.0
• 0.5

0.0 0.5 1.0 1.5 2.0 2.5 3.0

PseudoRapidity η η η η

Charged Particle Density

7 TeV RDF Preliminary

dashed = ND solid = NSD

CMS CMS dN dN/d /dη η η η η η η η

Generator level dN/dη η η η (all pT). Shows the NSD = HC + DD and the HC = ND contributions for Tune DW. Also shows the CMS NSD data.

CMS

Tune DW

All pT

Soft particles!

Proton Proton

“Minimum Bias” Collisions

Off by 30%!

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 72

Min Min-

• Bias Collisions

Bias Collisions

• CMS NSD data on the charged particle

rapidity distribution at 7 TeV compared with PYTHIA Tune Z1. The plot shows the average number of particles per NSD collision per unit η η η η, (1/NNSD) dN/dη η η η.

CMS

Proton Proton

“Minimum Bias” Collisions

Okay not perfect, but remember we know that SD and DD are not modeled well!

Charged Particle Density: dN/dη η η η

2 4 6 8

• 4
• 3
• 2
• 1

1 2 3 4

Pseudo-Rapidity η η η η

Charged Particle Density

pyZ1 ND = dashed pyZ1 NSD = solid

CMS Data

PYTHIA Tune Z1

NSD (all pT)

7 TeV

• ALICE NSD data on the charged particle

rapidity distribution at 900 GeV compared with PYTHIA Tune Z1. The plot shows the average number of particles per INEL collision per unit η η η η, (1/NINEL) dN/dη η η η.

Tune Z1

Charged Particle Density: dN/dη η η η

2 4 6

• 4
• 3
• 2
• 1

1 2 3 4

Pseudo-Rapidity η η η η

Charged Particle Density

pyZ1 NSD = dashed pyZ1 INEL = solid

ALICE Data

PYTHIA Tune Z1

INEL (all pT)

900 GeV

Tune Z1

ALICE

NSD = ND + DD INEL = NSD + SD

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 73

PYTHIA Tune Z1 PYTHIA Tune Z1

• ALICE inelastic data at 900 GeV on the dN/dη

η η η distribution for charged particles (pT > PTmin) for events with at least one charged particle with pT > PTmin and |η η η η| < 0.8 for PTmin = 0.15 GeV/c, 0.5 GeV/c, and 1.0 GeV/c compared with PYTHIA Tune Z1 at the generator level.

Charged Particle Density: dN/dη η η η

1 2 3 4 5

• 2.0
• 1.5
• 1.0
• 0.5

0.0 0.5 1.0 1.5 2.0

PseudoRapidity η η η η

Charged Particle Density

900 GeV

pT > 0.15 GeV/c

RDF Preliminary

pT > 0.5 GeV/c pT > 1.0 GeV/c At Least 1 Charged Particle |η η η η| < 0.8

Proton Proton

“Minumum Bias” Collisions

Okay not perfect, but remember we do not know if the SD & DD are correct!

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 74

MB versus UE MB versus UE

• CMS NSD data on the charged particle

rapidity distribution at 7 TeV compared with PYTHIA Tune Z1. The plot shows the average number of charged particles per NSD collision per unit η η η η, (1/NNSD) dN/dη η η η.

CMS

Proton Proton

“Minimum Bias” Collisions

Charged Particle Density: dN/dη η η η

2 4 6 8

• 4
• 3
• 2
• 1

1 2 3 4

Pseudo-Rapidity η η η η

Charged Particle Density

pyZ1 ND = dashed pyZ1 NSD = solid

CMS Data

PYTHIA Tune Z1

NSD (all pT)

7 TeV

Tune Z1

NSD = ND + DD

• CMS NSD data on the charged particle rapidity

distribution at 7 TeV compared with PYTHIA Tune Z1. The plot shows the average number of charged particles per NSD collision per unit η η η η− − − −φ φ φ φ, (1/NNSD) dN/dη η η ηdφ φ φ φ.

Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.5 1.0 1.5 2.0 2.5

• 4
• 3
• 2
• 1

1 2 3 4

Pseudo-Rapidity η η η η

Charged Particle Density

pyZ1 ND = dashed pyZ1 NSD = solid

CMS Data

PYTHIA Tune Z1

NSD (all pT)

7 TeV

Divide be 2π π π π

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 75

MB versus UE MB versus UE

Proton Proton

“Minimum Bias” Collisions

CMS

Tune Z1

NSD = ND + DD

• CMS NSD data on the charged particle rapidity

distribution at 7 TeV compared with PYTHIA Tune Z1. The plot shows the average number of charged particles per NSD collision per unit η η η η− − − −φ φ φ φ, (1/NNSD) dN/dη η η ηdφ φ φ φ.

Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.5 1.0 1.5 2.0 2.5

• 4
• 3
• 2
• 1

1 2 3 4

Pseudo-Rapidity η η η η

Charged Particle Density

pyZ1 ND = dashed pyZ1 NSD = solid

CMS Data

PYTHIA Tune Z1

NSD (all pT)

7 TeV

Transverse Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.5 1.0 1.5 2.0 2.5 5 10 15 20 25

PT max (GeV/c)

Charged Particle Density

7 TeV ND

Charged Particles (|η η η η| < 2, all pT)

RDF Preliminary

PYTHIA Tune Z1

Proton Proton

PT(hard)

• Shows the density of charged particles in

the “transverse” region as a function of PTmax for charged particles (All pT, |η η η η| < 2) at 7 TeV from PYTHIA Tune Z1.

Tune Z1 Factor of 2!

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 76

MB versus UE MB versus UE

Proton Proton

“Minimum Bias” Collisions

CMS

Tune Z1

NSD = ND + DD

• CMS NSD data on the charged particle rapidity

distribution at 7 TeV compared with PYTHIA Tune Z1. The plot shows the average number of charged particles per NSD collision per unit η η η η− − − −φ φ φ φ, (1/NNSD) dN/dη η η ηdφ φ φ φ.

Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.5 1.0 1.5 2.0 2.5

• 4
• 3
• 2
• 1

1 2 3 4

Pseudo-Rapidity η η η η

Charged Particle Density

pyZ1 ND = dashed pyZ1 NSD = solid

CMS Data

PYTHIA Tune Z1

NSD (all pT)

7 TeV Proton Proton

PT(hard)

• ATLAS data on the density of charged

particles in the “transverse” region as a function of PTmax for charged particles (pT > 0.1 GeV/c, |η η η η| < 2.5) at 7 TeV compared with PYTHIA Tune Z1.

Factor of 2!

"Transverse" Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.5 1.0 1.5 2.0 2.5 2 4 6 8 10 12 14 16 18 20

PTmax (GeV/c)

"Transverse" Charged Density RDF Preliminary

ATLAS corrected data Tune Z1 generator level

7 TeV

Charged Particles (pT > 0.1 GeV/c, |η η η η|<2.5)

ATLAS

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 77

NSD Multiplicity Distribution NSD Multiplicity Distribution

Generator level charged multiplicity distribution (all pT, |η η η η| < 2) at 900 GeV and 7

• TeV. Shows the NSD = HC + DD prediction for Tune Z1. Also shows the CMS

NSD data.

Charged Multiplicity Distribution

1.0E-04 1.0E-03 1.0E-02 1.0E-01 20 40 60 80 100

Number of Charged Particles Probability

Charged Particles (all PT, |η η η η|<2.0)

RDF Preliminary

data CMS NSD pyZ1 generator level

7 TeV 900 GeV

CMS

Tune Z1

Difficult to produce enough events with large multiplicity!

Proton Proton

“Minumum Bias” Collisions

Okay not perfect! But not that bad!

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 78

"Transverse" Charged Particle Multiplicity

1.0E-05 1.0E-04 1.0E-03 1.0E-02 1.0E-01 1.0E+00 5 10 15 20 25 30 35

Number of Charged Particles

Probability

CMS Preliminary

Data Corrected Tune Z1 generator level

Charged Particles (|η η η η|<2.0, PT>0.5 GeV/c)

7 TeV

PT(chgjet#1) > 3 GeV/c

900 GeV

MB & UE MB & UE

Generator level charged multiplicity distribution (all pT, |η η η η| < 2) at 900 GeV and 7 TeV. Shows the NSD = HC + DD prediction for Tune Z1. Also shows the CMS NSD data.

Charged Multiplicity Distribution

1.0E-04 1.0E-03 1.0E-02 1.0E-01 20 40 60 80 100

Number of Charged Particles Probability

Charged Particles (all PT, |η η η η|<2.0)

RDF Preliminary

data CMS NSD pyZ1 generator level

7 TeV 900 GeV

• CMS corrected data at 900 GeV and 7

TeV on the charged particle multiplicity distribution in the “transverse” region for charged particles (pT > 0.5 GeV/c, |η η η η| < 2) as defined by the leading charged particle jet with PT(chgjet#1) > 3 GeV/c compared with PYTHIA Tune Z1 at the generator level.

CMS CMS

Tune Z1 Tune Z1 “Min-Bias” “Underlying Event”

Difficult to produce enough events with large multiplicity! Difficult to produce enough events with large “transverse” multiplicity at low hard scale!

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 79

How How Universal Universal are the Tunes? are the Tunes?

PARP(82) Diffraction

Proton Proton

PT(hard)

Do we need a separate tune for each center-of-mass energy?

900 GeV, 1.96 TeV, 7 TeV, etc. PYTHIA Tune DW did a nice (although not perfect) job predicting the LHC Jet Production and Drell-Yan UE data. I am still hoping for a single tune that will describe all energies!

Proton Proton

PT(hard)

Do we need a separate tune for each hard QCD

subprocess? Jet Production, Drell-Yan Production, etc. The same tune can describe both Jet Production and Drell-Yan!

Proton Proton

“Minimum Bias” Collisions

Do we need separate tunes for “Min-Bias” (MB) and the

“underlying event” (UE) in a hard scattering process? PHTHIA Tune Z1 does fairly well at both the UE and MB, but you cannot expect such a naïve approach to be perfect!

P A R P ( 9 ) Color Connections

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 80

Kaon Kaon Production Production

• CMS NSD data on the Kshort rapidity

distribution at 7 TeV and 900 GeV compared with PYTHIA Tune Z1. The plot shows the average number of Kshort per NSD collision per unit Y, (1/NNSD) dN/dY.

Proton Proton

“Minimum Bias” Collisions

Kshort Rapidity Distribution: dN/dY

0.0 0.1 0.2 0.3 0.4 0.5

• 4
• 3
• 2
• 1

1 2 3 4

Rapidity Y

dN/dY CMS Data

PYTHIA Tune Z1

900 GeV 7 TeV

NSD (all pT)

Tune Z1

CMS

Kshort Rapidity Distribution: dN/dY

0.0 0.1 0.2 0.3 0.4

• 4
• 3
• 2
• 1

1 2 3 4

Rapidity Y

dN/dY 900 GeV CMS & ALICE Data

PYTHIA Tune Z1

CMS NSD ALICE INEL pyZ1 NSD = solid pyZ1 INEL = dashed

• CMS NSD data on the Kshort rapidity

distribution at 900 GeV and the ALICE point at Y = 0 (INEL) compared with PYTHIA Tune Z1. The ALICE point is the average number of Kshort per INEL collision per unit Y at Y = 0, (1/NINEL) dN/dY.

Tune Z1

INEL = NSD + SD

No overall shortage of Kaons in PYTHIA Tune Z1!

Kshort

d s s d +

Kshort

d s s d +

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 81

Kaon Kaon Production Production

• ALICE INEL data on the charged kaon

rapidity distribution at 900 GeV compared with PYTHIA Tune Z1. The plot shows the average number of charged kaons per INEL collision per unit Y at Y = 0, (1/NINEL) dN/dY.

Proton Proton

“Minimum Bias” Collisions

Charged Kaons Rapidity: dN/dY

0.0 0.2 0.4 0.6

• 4
• 3
• 2
• 1

1 2 3 4

Rapidity Y

dN/dY ALICE Data

PYTHIA Tune Z1

INEL (all pT)

900 GeV

pyZ1 NSD = dashed pyZ1 INEL = solid

(K++K-)

Rapidity Distribution Ratio: Kaons/Pions

0.0 0.1 0.2 0.3

• 4
• 3
• 2
• 1

1 2 3 4

Rapidity Y

dN/dY Particle Ratio ALICE Data

PYTHIA Tune Z1

INEL (all pT)

900 GeV

(K++K-)/(π π π π++π π π π-)

• ALICE INEL data on the charged kaon to

charged pion rapidity ratio at 900 GeV compared with PYTHIA Tune Z1.

ALICE ALICE

Tune Z1 Tune Z1

No overall shortage of Kaons in PYTHIA Tune Z1!

(K++ K-) (π π π π++ π π π π-) = Strange Meson

Non-strange Meson

K+

u s

K-

u s

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 82

Kaon Kaon Production Production

• ALICE INEL data on the charged kaon

rapidity distribution at 900 GeV compared with PYTHIA Tune Z1. The plot shows the average number of charged kaons per INEL collision per unit Y at Y = 0, (1/NINEL) dN/dY.

Proton Proton

“Minimum Bias” Collisions

Charged Kaons Rapidity: dN/dY

0.0 0.2 0.4 0.6

• 4
• 3
• 2
• 1

1 2 3 4

Rapidity Y

dN/dY ALICE Data

PYTHIA Tune Z1

INEL (all pT)

900 GeV

pyZ1 NSD = dashed pyZ1 INEL = solid

(K++K-)

Rapidity Distribution Ratio: Kaons/Pions

0.0 0.1 0.2 0.3

• 4
• 3
• 2
• 1

1 2 3 4

Rapidity Y

dN/dY Particle Ratio ALICE Data

PYTHIA Tune Z1

INEL (all pT)

900 GeV

(K++K-)/(π π π π++π π π π-)

• ALICE INEL data on the charged kaon to

charged pion rapidity ratio at 900 GeV compared with PYTHIA Tune Z1.

ALICE ALICE

Tune Z1 Tune Z1

Rapidity Distribution Ratio: Kshort/Kaons

0.0 0.2 0.4 0.6 0.8

• 4
• 3
• 2
• 1

1 2 3 4

Rapidity Y

dN/dY Particle Ratio ALICE Data

PYTHIA Tune Z1

INEL (all pT)

900 GeV

Kshort/(K++K-)

No overall shortage of Kaons in PYTHIA Tune Z1!

(K++ K-) (π π π π++ π π π π-) = Strange Meson

Non-strange Meson

K+

u s

K-

u s

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 83

Particle Ratios versus PT Particle Ratios versus PT

Proton Proton

“Minimum Bias” Collisions

PT Particle Ratio: Kaons/Pions

0.00 0.20 0.40 0.60 1 2 3 4

PT (GeV/c)

PT Particle Ratio

(K++K-)/(π π π π++π π π π-)

ALICE Data

PYTHIA Tune Z1 & Z1C

INEL (|Y| < 0.75)

900 GeV

Z1 Z1C Tune Z1C qq/q: 0.1 -> 0.12 us/s: 0.4 -> 0.8

Rapidity Distribution Ratio: Kaons/Pions

0.0 0.1 0.2 0.3

• 4
• 3
• 2
• 1

1 2 3 4

Rapidity Y

dN/dY Particle Ratio ALICE Data

PYTHIA Tune Z1 & Z1C

INEL (all pT)

900 GeV

(K++K-)/(π π π π++π π π π-)

Z1 Z1C Tune Z1C qq/q: 0.1 -> 0.12 us/s: 0.4 -> 0.8

• ALICE INEL data on the charged kaon to

charged pion rapidity ratio at 900 GeV compared with PYTHIA Tune Z1.

• ALICE INEL data on the charged kaons to

charged pions ratio versus pT at 900 GeV (|Y| < 0.75) compared with PYTHIA Tune Z1 & Z1C.

PYTHIA pT dependence off on Kaons!

(K++ K-) (π π π π++ π π π π-) = Strange Meson

Non-strange Meson

Tails of the pT distribution. Way off due to the wrong pT!

K+

u s

K-

u s

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 84

PYTHIA 6.4.25 PYTHIA 6.4.25

• 4th generation: tunes incorporating 7-TeV data
• 340 AMBT1 : 1st ATLAS tune incl 7 TeV, w. LO* PDFs

(2010) 341 Z1 : Retune of AMBT1 by Field w CTEQ5L PDFs (2010) 342 Z1-LEP : Retune of Z1 by Skands w CTEQ5L PDFs (2010) 343 Z2 : Retune of Z1 by Field w CTEQ6L1 PDFs (2010) 344 Z2-LEP : Retune of Z1 by Skands w CTEQ6L1 PDFs (2010) 350 Perugia 2011 : Retune of Perugia 2010 incl 7-TeV data (Mar 2011) 351 P2011 radHi : Variation with alphaS(pT/2) 352 P2011 radLo : Variation with alphaS(2pT) 353 P2011 mpiHi : Variation with more semi-hard MPI 354 P2011 noCR : Variation without color reconnections 355 P2011 LO** : Perugia 2011 using MSTW LO** PDFs (Mar 2011) 356 P2011 C6 : Perugia 2011 using CTEQ6L1 PDFs (Mar 2011) 357 P2011 T16 : Variation with PARP(90)=0.16 away from 7 TeV 358 P2011 T32 : Variation with PARP(90)=0.32 awat from 7 TeV 359 P2011 TeV : Perugia 2011 optimized for Tevatron (Mar 2011) 360 S Global : Schulz-Skands Global fit (Mar 2011) 361 S 7000 : Schulz-Skands at 7000 GeV (Mar 2011) 362 S 1960 : Schulz-Skands at 1960 GeV (Mar 2011) 363 S 1800 : Schulz-Skands at 1800 GeV (Mar 2011) 364 S 900 : Schulz-Skands at 900 GeV (Mar 2011) 365 S 630 : Schulz-Skands at 630 GeV (Mar 2011) ========================================================= Tune Z1 Tune Z2 Tune S350 Tune S356

PYTUNE

CTEQ5L CTEQ6L CTEQ5L CTEQ6L

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 85

LEP: LEP: K Kshort

short Spectrum

Spectrum

x

0.2 0.4 0.6 0.8

/dx σ d σ 1/

• 2

10

• 1

10 1 10

10

ALEPH Pythia 6 (350:P2011) Pythia 6 (340:AMBT1) Pythia 6 (327:P2010) Pythia 6 (129:Pro-Q2O) Pythia 6 (343:Z2)

91 GeV ee

Z (hadronic)

Pythia 6.425 ALEPH_1996_S3486095 spectrum (particle-level) K

0.2 0.4 0.6 0.8 0.5 1 1.5

Ratio to ALEPH

S350 Perugia 2011

Theory/Data

Rapidity Distribution Ratio: Kaons/Pions

0.0 0.1 0.2 0.3

• 4
• 3
• 2
• 1

1 2 3 4

Rapidity Y

dN/dY Particle Ratio ALICE Data

PYTHIA Tune Z1 & S350

INEL (all pT) 900 GeV

(K++K-)/(π π π π++π π π π-)

pyZ1 = solid pyS350 = dashed

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 86

Lambda Production Lambda Production

• CMS NSD data on the Lambda+AntiLambda

rapidity distribution at 7 TeV and 900 GeV compared with PYTHIA Tune Z1. The plot shows the average number of particles per NSD collision per unit Y, (1/NNSD) dN/dY.

Proton Proton

“Minimum Bias” Collisions

(Lam+LamBar) Rapidity Distribution: dN/dY

0.00 0.05 0.10 0.15 0.20 0.25

• 4
• 3
• 2
• 1

1 2 3 4

Rapidity Y

dN/dY CMS Data

PYTHIA Tune Z1

900 GeV 7 TeV

NSD (all pT)

(Λ Λ Λ Λ+Λ Λ Λ Λ)

_ Rapidity Distribution Ratio: (Lam+LamBar)/(2Kshort)

0.0 0.1 0.2 0.3 0.4 0.5

• 4
• 3
• 2
• 1

1 2 3 4

Rapidity Y

dN/dY Particle Ratio CMS Data

PYTHIA Tune Z1

7 TeV

NSD (all pT)

(Λ Λ Λ Λ+Λ Λ Λ Λ)/(2Kshort)

_

CMS

Tune Z1

• CMS NSD data on the Lambda+AntiLambda

to 2Kshort rapidity ratio at 7 TeV compared with PYTHIA Tune Z1.

CMS

Tune Z1

Factor of 1.5!

Oops! Not enough Lambda’s in PYTHIA Tune Z1!

(Λ Λ Λ Λ + Λ Λ Λ Λ) 2Kshort =

Single-strange Baryon Strange Meson

Λ Λ Λ Λ

u d s

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 87

LEP: LEP: Λ Λ Λ Λ Λ Λ Λ Λ Spectrum Spectrum

x

0.2 0.4 0.6 0.8

/dx σ d σ 1/

• 3

10

• 2

10

• 1

10 1 10

ALEPH Pythia 6 (350:P2011) Pythia 6 (340:AMBT1) Pythia 6 (327:P2010) Pythia 6 (129:Pro-Q2O) Pythia 6 (343:Z2)

91 GeV ee

Z (hadronic)

Pythia 6.425 ALEPH_1996_S3486095 spectrum (particle-level) Lambda

0.2 0.4 0.6 0.8 0.5 1 1.5

Ratio to ALEPH

S350 Perugia 2011

Theory/Data

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 88

Cascade Production Cascade Production

• CMS NSD data on the Cascade-

+AntiCascade- rapidity distribution at 7 TeV and 900 GeV compared with PYTHIA Tune

• Z1. The plot shows the average number of

particles per NSD collision per unit Y, (1/NNSD) dN/dY.

Proton Proton

“Minimum Bias” Collisions

(Cas+CasBar) Rapidity Distribution: dN/dY

0.00 0.01 0.02 0.03

• 4
• 3
• 2
• 1

1 2 3 4

Rapidity Y

dN/dY CMS Data

PYTHIA Tune Z1

900 GeV 7 TeV

NSD (all pT)

(Ξ Ξ Ξ Ξ−

Ξ Ξ Ξ−

_ Rapidity Distribution Ratio: (Cas+CasBar)/(2Kshort)

0.00 0.01 0.02 0.03 0.04 0.05

• 4
• 3
• 2
• 1

1 2 3 4

Rapidity Y

dN/dY Particle Ratio CMS Data

PYTHIA Tune Z1

7 TeV

NSD (all pT)

(Ξ Ξ Ξ Ξ−

Ξ Ξ Ξ−

_

CMS

Tune Z1

• CMS data on the Cascade-+AntiCascade- to

2Kshort rapidity ratio at 7 TeV compared with PYTHIA Tune Z1.

CMS

Tune Z1

Factor of 2!

Yikes! Way too few Cascade’s in PYTHIA Tune Z1!

(Ξ Ξ Ξ Ξ + Ξ Ξ Ξ Ξ) 2Kshort =

Double-strange Baryon Strange Meson

Ξ Ξ Ξ Ξ−

− − −

d s s

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 89

LEP: LEP: Ξ Ξ Ξ Ξ Ξ Ξ Ξ Ξ Spectrum Spectrum

x

0.1 0.2 0.3 0.4 0.5

/dx σ d σ 1/

• 2

10

• 1

10 1

ALEPH Pythia 6 (350:P2011) Pythia 6 (340:AMBT1) Pythia 6 (327:P2010) Pythia 6 (129:Pro-Q2O) Pythia 6 (343:Z2)

91 GeV ee

Z (hadronic)

Pythia 6.425 ALEPH_1996_S3486095 spectrum (particle-level)

• Ξ

0.1 0.2 0.3 0.4 0.5 0.5 1 1.5

Ratio to ALEPH

S350 Perugia 2011

Theory/Data

Rapidity Distribution Ratio: (Cas+CasBar)/(2Kshort)

0.00 0.01 0.02 0.03 0.04 0.05

• 4
• 3
• 2
• 1

1 2 3 4

Rapidity Y

dN/dY Particle Ratio 7 TeV

NSD (all pT)

(Ξ Ξ Ξ Ξ−

Ξ Ξ Ξ−

_

pyZ1 = solid pyS350 = dashed

CMS Data

PYTHIA Tune Z1 & S350

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 90

Transverse Momentum Transverse Momentum Distributions Distributions

PT Distribution: Cas+CasBar

1.0E-04 1.0E-03 1.0E-02 1.0E-01 1 2 3 4 5 6 7

PT (GeV/c)

dN/dPT (1/GeV/c) CMS Data

PYTHIA Tune Z1 & Z1C

NSD (|Y| < 2)) Z1 Z1C Tune Z1C qq/q: 0.1 -> 0.12 us/s: 0.4 -> 0.8

7 TeV

(Ξ Ξ Ξ Ξ−

Ξ Ξ Ξ−

_ Cas+CasBar PT Distribution: dN/dPT

1.0E-03 1.0E-02 1.0E-01 1.0E+00 1 2 3 4 5 6 7

PT (GeV/c)

Probability CMS Data

PYTHIA Tune Z1 & Z1C

NSD (|Y| < 2)) Z1 Z1C Tune Z1C qq/q: 0.1 -> 0.12 us/s: 0.4 -> 0.8

7 TeV

(Ξ Ξ Ξ Ξ−

Ξ Ξ Ξ−

_

Normalized to 1

• CMS NSD data on the Cascade-

+AntiCascade- transverse momentum distribution at 7 TeV compared with PYTHIA Tune Z1 & Z1C. The plot shows the average number of particles per NSD collision per unit pT, (1/NNSD) dN/dpT for |Y| < 2.

• CMS NSD data on the Cascade-

+AntiCascade- transverse momentum distribution at 7 TeV (normalized to 1) compared with PYTHIA Tune Z1 & Z1C.

Proton Proton

“Minimum Bias” Collisions

PYTHIA Tune Z1 & Z1C are a bit off on the pT dependence!

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 91

Particle Ratios versus PT Particle Ratios versus PT

Proton Proton

“Minimum Bias” Collisions

(p + p) (π π π π++ π π π π-) = Non-strange Baryon

Non-strange Meson

PT Particle Ratio: (P+Pbar)/Pions

0.0 0.1 0.2 0.3 0.4 1 2 3 4

PT (GeV/c)

PT Particle Ratio ALICE Data

PYTHIA Tune Z1 & Z1C

INEL (|Y| < 0.75)

900 GeV

Z1 Z1C Tune Z1C qq/q: 0.1 -> 0.12 us/s: 0.4 -> 0.8

(p+p)/(π π π π++π π π π-) _

Rapidity Distribution Ratio: (P+Pbar)/Pions

0.00 0.03 0.06 0.09 0.12

• 4
• 3
• 2
• 1

1 2 3 4

Rapidity Y

dN/dY Particle Ratio

INEL (all pT)

900 GeV

(p+p)/(π π π π++π π π π-) _

ALICE Data

PYTHIA Tune Z1 & Z1C

Z1 Z1C Tune Z1C qq/q: 0.1 -> 0.12 us/s: 0.4 -> 0.8

• ALICE INEL data on the Proton+AntiProton

to charged pions ratio versus pT at 900 GeV (|Y| < 0.75) compared with PYTHIA Tune Z1 & Z1C.

• ALICE INEL data on the

Proton+AntiProton to charged pion rapidity ratio at 900 GeV compared with PYTHIA Tune Z1 & Z1C.

PYTHIA way off on the pT dependence of Protons!

Tails of the pT distribution. Way off due to the wrong pT! Too many overall protons!

p

u u d

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 92

LEP: Proton Spectrum LEP: Proton Spectrum

x

0.2 0.4 0.6 0.8

/dx σ d σ 1/

• 2

10

• 1

10 1 10

10

ALEPH Pythia 6 (350:P2011) Pythia 6 (340:AMBT1) Pythia 6 (327:P2010) Pythia 6 (129:Pro-Q2O) Pythia 6 (343:Z2)

91 GeV ee

Z (hadronic)

Pythia 6.425 ALEPH_1996_S3486095 p spectrum (particle-level)

0.2 0.4 0.6 0.8 0.5 1 1.5

Ratio to ALEPH

S350 Perugia 2011

Theory/Data

Rapidity Distribution Ratio: (P+Pbar)/Pions

0.00 0.03 0.06 0.09 0.12

• 4
• 3
• 2
• 1

1 2 3 4

Rapidity Y

dN/dY Particle Ratio 900 GeV (p+p)/(π π π π++π π π π-) _ ALICE Data

PYTHIA Tune Z1 & S350

INEL (all pT) pyZ1 = solid pyS350 = dashed

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 93

MB versus UE MB versus UE

Proton Proton

“Minimum Bias” Collisions

CMS

Tune Z1

NSD = ND + DD

• CMS NSD data on the charged particle rapidity

distribution at 7 TeV compared with PYTHIA Tune Z1. The plot shows the average number of charged particles per NSD collision per unit η η η η− − − −φ φ φ φ, (1/NNSD) dN/dη η η ηdφ φ φ φ.

Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.5 1.0 1.5 2.0 2.5

• 4
• 3
• 2
• 1

1 2 3 4

Pseudo-Rapidity η η η η

Charged Particle Density

pyZ1 ND = dashed pyZ1 NSD = solid

CMS Data

PYTHIA Tune Z1

NSD (all pT)

7 TeV

Transverse Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.5 1.0 1.5 2.0 2.5 5 10 15 20 25

PT max (GeV/c)

Charged Particle Density

7 TeV ND

Charged Particles (|η η η η| < 2, all pT)

RDF Preliminary

PYTHIA Tune Z1

Proton Proton

PT(hard)

• Shows the density of charged particles in

the “transverse” region as a function of PTmax for charged particles (All pT, |η η η η| < 2) at 7 TeV from PYTHIA Tune Z1.

Tune Z1 Factor of 2!

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 94

UE Particle Type UE Particle Type

Proton Proton

PT(hard)

Transverse Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.0 0.5 1.0 1.5 2.0 2.5 5 10 15 20 25

PT max (GeV/c)

Charged Particle Density

7 TeV ND

Charged Particles (|η η η η| < 2, all pT)

RDF Preliminary

PYTHIA Tune Z1

• Shows the density of charged particles in

the “transverse” region as a function of PTmax for charged particles (All pT, |η η η η| < 2) at 7 TeV from PYTHIA Tune Z1.

Tune Z1

Transverse Particle Density: dN/dη η η ηdφ φ φ φ

0.001 0.010 0.100 1.000 10.000 5 10 15 20 25

PTmax (GeV/c)

Particle Density

charged particles

7 TeV ND

(|η η η η| < 2, all pT)

RDF Preliminary

PYTHIA Tune Z1

(Λ Λ Λ Λ+Λ Λ Λ Λ)

_

(p+p)

_

(Ξ Ξ Ξ Ξ−

Ξ Ξ Ξ−

_

(K++K-) (π π π π++π π π π-)

Proton Proton

PT(hard)

• Shows the density of particles in the

“transverse” region as a function of PTmax for charged particles (All pT, |η η η η| < 2) at 7 TeV from PYTHIA Tune Z1. Log Scale!

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 95

Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.00 0.05 0.10 0.15

• 4
• 3
• 2
• 1

1 2 3 4

Pseudo-Rapidity η η η η

Charged Particle Density

7 TeV ND

Kshort (all pT)

RDF Preliminary

PYTHIA Tune Z1

Kshort

"Transverse" Particle Density: dN/dη η η ηdφ φ φ φ

0.00 0.05 0.10 0.15 5 10 15 20 25

PT max (GeV/c)

Particle Density

7 TeV ND

Kshort (|η η η η| < 2, all pT)

RDF Preliminary

PYTHIA Tune Z1

Kshort

MB versus UE MB versus UE

Proton Proton

“Minimum Bias” Collisions

Tune Z1

• Shows the Kshort pseudo-rapidity distribution (all

pT) at 7 TeV from PYTHIA Tune Z1. The plot shows the average number of particles per ND collision per unit η η η η− − − −φ φ φ φ, (1/NND) dN/dη η η ηdφ φ φ φ.

Proton Proton

PT(hard)

• Shows the density of Kshort particles in the

“transverse” region as a function of PTmax for charged particles (All pT, |η η η η| < 2) at 7 TeV from PYTHIA Tune Z1.

Tune Z1 Factor of ~2!

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 96

"Transverse" Particle Density: dN/dη η η ηdφ φ φ φ

0.00 0.04 0.08 0.12 5 10 15 20 25

PT max (GeV/c)

Particle Density

(p+p) _ 7 TeV ND (|η η η η| < 2,all pT) RDF Preliminary

PYTHIA Tune Z1

Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.00 0.04 0.08 0.12

• 4
• 3
• 2
• 1

1 2 3 4

Pseudo-Rapidity η η η η

Charged Particle Density

7 TeV ND (all pT) RDF Preliminary

PYTHIA Tune Z1

(p+p)

_

MB versus UE MB versus UE

Proton Proton

“Minimum Bias” Collisions

Tune Z1

• Shows the P+antiP pseudo-rapidity distribution

(all pT) at 7 TeV from PYTHIA Tune Z1. The plot shows the average number of particles per ND collision per unit η η η η− − − −φ φ φ φ, (1/NND) dN/dη η η ηdφ φ φ φ.

Proton Proton

PT(hard)

• Shows the density of P+antiP particles in

the “transverse” region as a function of PTmax for charged particles (All pT, |η η η η| < 2) at 7 TeV from PYTHIA Tune Z1.

Tune Z1 Factor of ~2!

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 97

"Transverse" Particle Density: dN/dη η η ηdφ φ φ φ

0.00 0.01 0.02 0.03 0.04 5 10 15 20 25

PT max (GeV/c)

Particle Density

7 TeV ND (|η η η η| < 2,all pT) RDF Preliminary

PYTHIA Tune Z1

(Λ Λ Λ Λ+Λ Λ Λ Λ)

_ Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.00 0.01 0.02 0.03 0.04

• 4
• 3
• 2
• 1

1 2 3 4

Pseudo-Rapidity η η η η

Charged Particle Density

7 TeV ND (all pT) RDF Preliminary

PYTHIA Tune Z1

(Λ Λ Λ Λ+Λ Λ Λ Λ)

_

MB versus UE MB versus UE

Proton Proton

“Minimum Bias” Collisions

Tune Z1

• Shows the Λ

Λ Λ Λ+antiΛ Λ Λ Λ pseudo-rapidity distribution (all pT) at 7 TeV from PYTHIA Tune Z1. The plot shows the average number of particles per ND collision per unit η η η η− − − −φ φ φ φ, (1/NND) dN/dη η η ηdφ φ φ φ.

Proton Proton

PT(hard)

• Shows the density of Λ

Λ Λ Λ+antiΛ Λ Λ Λ particles in the “transverse” region as a function of PTmax for charged particles (All pT, |η η η η| < 2) at 7 TeV from PYTHIA Tune Z1.

Tune Z1 Factor of ~2!

Coming soon! Measurements from CMS, ATLAS, and ALICE on the strange particles and baryons in the “underlying event”.

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 98

Fragmentation Summary Fragmentation Summary

Strange Particle & Baryon Yields: PYTHIA is off

• n the overall yield of Lambda’s and Cascades

(MC below the data) and too high on the proton

• yield. Difficult to fix this without destroying

agreement with LEP! PT Distributions: PYTHIA does not describe correctly the pT distributions

• f heavy particles (MC softer than the data). None of the fragmentation

parameters I have looked at changes the pT distributions. Hence, if one looks at particle ratios at large pT you can see big discrepancies between data and MC (out in the tails of the distributions)!

Proton Proton

“Minimum Bias” Collisions

K+

u s

K-

u s

Kshort

d s s d +

p

u u d

Λ Λ Λ Λ

u d s

Ξ Ξ Ξ Ξ−

− − −

d s s

Factorization: Are we seeing a breakdown in factorization between e+e- annihilations and hadron-hadron collisions! Is something happening in hadron-hadron collisions that does not happen in e+e- annihilations? Herwig++ & Sherpa: Before making any conclusions about fragmentation

• ne must check the predictions of Herwig++ and Sherpa carefully!

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 99

Fragmentation Summary Fragmentation Summary

Strange Particle & Baryon Yields: PYTHIA is off

• n the overall yield of Lambda’s and Cascades

(MC below the data) and too high on the proton

• yield. Difficult to fix this without destroying

agreement with LEP! PT Distributions: PYTHIA does not describe correctly the pT distributions

• f heavy particles (MC softer than the data). None of the fragmentation

parameters I have looked at changes the pT distributions. Hence, if one looks at particle ratios at large pT you can see big discrepancies between data and MC (out in the tails of the distributions)!

Proton Proton

“Minimum Bias” Collisions

K+

u s

K-

u s

Kshort

d s s d +

p

u u d

Λ Λ Λ Λ

u d s

Ξ Ξ Ξ Ξ−

− − −

d s s

Factorization: Are we seeing a breakdown in factorization between e+e- annihilations and hadron-hadron collisions! Is something happening in hadron-hadron collisions that does not happen in e+e- annihilations? Herwig++ & Sherpa: Before making any conclusions about fragmentation

• ne must check the predictions of Herwig++ and Sherpa carefully!

Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.00 0.04 0.08 0.12

• 10
• 8
• 6
• 4
• 2

2 4 6 8 10

Pseudo-Rapidity η η η η

Charged Particle Density 7 TeV ND (all pT) RDF Preliminary

PYTHIA Tune Z1

(p+p)

_

Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.00 0.01 0.02 0.03 0.04

• 10
• 8
• 6
• 4
• 2

2 4 6 8 10

Pseudo-Rapidity η η η η

Charged Particle Density

7 TeV ND (all pT) RDF Preliminary

PYTHIA Tune Z1

(Λ Λ Λ Λ+Λ Λ Λ Λ)

_

Beam-meam remnants! Beam-meam remnants!

GGI Florence, Italy September 14, 2011 Rick Field – Florida/CDF/CMS Page 100

Sherpa versus PYTHIA Sherpa versus PYTHIA

Before making any conclusion about e+e- versus pp collisions one must check the predictions of Herwig++ and Sherpa!

Strange particle production in pp at 200 GeV (STAR_2006_S6860818) Hendrik Hoeth http://users.hepforge.org/~hoeth/STAR_2006_S6860818/

<pT> versus Mass

Sherpa does better than PYTHIA 8!