MPI@LHC 2015 MPI@LHC 2015 Ricks Story of the UE Rick Field - - PowerPoint PPT Presentation

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MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 1

Outline of Talk

CMS at the LHC CDF “Tevatron Energy Scan” 300 GeV, 900 GeV, 1.96 TeV 900 GeV, 7 TeV, 13 TeV

MPI@LHC 2015 MPI@LHC 2015

Rick Field University of Florida

Early days of UE@MB at CMS. Early days of Field-Feynman phenomenology. UE@CMS at 13TeV. CMS “Physics Comparisons & Generator Tunes group”

and CMS UE Tunes.

LPCC MB&UE Working group and the “common plots”. Early studies the underlying event at CDF and Tune A.

Rick’s Story of the UE

Proton AntiProton

PT(hard)

Outgoing Parton Outgoing Parton Underlying Event Underlying Event Initial-State Radiation Final-State Radiation

The last CDF UE Publication. Mapping out the energy dependence of the UE,

Tevatron to the LHC.

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MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 2

Toward and Understanding of Toward and Understanding of Hadron Hadron-

• Hadron

Hadron Collisions Collisions

From 7 GeV/c π

π π π0’s to 1 TeV Jets. The early days of trying to understand and simulate hadron- hadron collisions.

Feynman-Field Phenomenology

Feynman and Field

Proton AntiProton

PT(hard)

Outgoing Parton Outgoing Parton Underlying Event Underlying Event Initial-State Radiation Final-State Radiation

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MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 3

Toward and Understanding of Toward and Understanding of Hadron Hadron-

• Hadron

Hadron Collisions Collisions

From 7 GeV/c π

π π π0’s to 1 TeV Jets. The early days of trying to understand and simulate hadron- hadron collisions.

Feynman-Field Phenomenology

Feynman and Field

Proton AntiProton

PT(hard)

Outgoing Parton Outgoing Parton Underlying Event Underlying Event Initial-State Radiation Final-State Radiation

1st hat!

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MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 4

“Feynman-Field Jet Model”

The Feynman The Feynman-

• Field

Field Days Days

FF1: “Quark Elastic Scattering as a Source of High Transverse Momentum Mesons”, R. D. Field and R. P. Feynman, Phys. Rev. D15, 2590-2616 (1977). FFF1: “Correlations Among Particles and Jets Produced with Large Transverse Momenta”, R. P. Feynman, R. D. Field and G. C. Fox, Nucl. Phys. B128, 1-65 (1977). FF2: “A Parameterization of the properties of Quark Jets”, R. D. Field and R. P. Feynman, Nucl. Phys. B136, 1-76 (1978). F1: “Can Existing High Transverse Momentum Hadron Experiments be Interpreted by Contemporary Quantum Chromodynamics Ideas?”, R. D. Field,

• Phys. Rev. Letters 40, 997-1000 (1978).

FFF2: “A Quantum Chromodynamic Approach for the Large Transverse Momentum Production of Particles and Jets”, R. P. Feynman, R. D. Field and G.

• C. Fox, Phys. Rev. D18, 3320-3343 (1978).

1973-1983

FW1: “A QCD Model for e+e- Annihilation”, R. D. Field and S. Wolfram, Nucl.

• Phys. B213, 65-84 (1983).

My 1st graduate student!

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MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 5

Hadron Hadron-

• Hadron

Hadron Collisions Collisions

What happens when two hadrons collide at high energy?

• Most of the time the hadrons ooze

through each other and fall apart (i.e. no hard scattering). The outgoing particles continue in roughly the same direction as initial proton and antiproton.

• Occasionally there will be a large

transverse momentum meson. Question: Where did it come from?

• We assumed it came from quark-quark

elastic scattering, but we did not know how to calculate it!

Hadron Hadron

???

Hadron Hadron

“Soft” Collision (no large transverse momentum)

Hadron Hadron

high PT meson

Parton-Parton Scattering

Outgoing Parton Outgoing Parton

FF1 1977

“Black-Box Model”

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MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 6

Hadron Hadron-

• Hadron

Hadron Collisions Collisions

What happens when two hadrons collide at high energy?

• Most of the time the hadrons ooze

through each other and fall apart (i.e. no hard scattering). The outgoing particles continue in roughly the same direction as initial proton and antiproton.

• Occasionally there will be a large

transverse momentum meson. Question: Where did it come from?

• We assumed it came from quark-quark

elastic scattering, but we did not know how to calculate it!

Hadron Hadron

???

Hadron Hadron

“Soft” Collision (no large transverse momentum)

Hadron Hadron

high PT meson

Parton-Parton Scattering

Outgoing Parton Outgoing Parton

FF1 1977

Feynman quote from FF1 “The model we shall choose is not a popular one, so that we will not duplicate too much of the work of others who are similarly analyzing various models (e.g. constituent interchange model, multiperipheral models, etc.). We shall assume that the high PT particles arise from direct hard collisions between constituent quarks in the incoming particles, which fragment or cascade down into several hadrons.”

“Black-Box Model”

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MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 7

Quark Quark-

• Quark Black

Quark Black-

• Box Model

Box Model

FF1 1977

Quark-Quark Cross-Section Unknown! Deteremined from hadron-hadron collisions. No gluons!

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MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 8

Quark Quark-

• Quark Black

Quark Black-

• Box Model

Box Model

FF1 1977

Quark Distribution Functions determined from deep-inelastic lepton-hadron collisions Quark Fragmentation Functions determined from e+e- annihilations Quark-Quark Cross-Section Unknown! Deteremined from hadron-hadron collisions. No gluons!

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MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 9

Quark Quark-

• Quark Black

Quark Black-

• Box Model

Box Model

FF1 1977

Quark Distribution Functions determined from deep-inelastic lepton-hadron collisions Quark Fragmentation Functions determined from e+e- annihilations Quark-Quark Cross-Section Unknown! Deteremined from hadron-hadron collisions. No gluons! Feynman quote from FF1 “Because of the incomplete knowledge of

• ur functions some things can be predicted

with more certainty than others. Those experimental results that are not well predicted can be “used up” to determine these functions in greater detail to permit better predictions of further experiments. Our papers will be a bit long because we wish to discuss this interplay in detail.”

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MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 10

Quark Quark-

• Quark Black

Quark Black-

• Box Model

Box Model

FF1 1977

Predict particle ratios Predict increase with increasing CM energy W Predict

• verall event topology

(FFF1 paper 1977) 7 GeV/c π π π π0’s!

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MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 11

Quark Quark-

• Quark Black

Quark Black-

• Box Model

Box Model

FF1 1977

Predict particle ratios Predict increase with increasing CM energy W Predict

• verall event topology

(FFF1 paper 1977)

“Beam-Beam Remnants”

7 GeV/c π π π π0’s! The beginning of the “underlying event”!

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MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 12

QCD Approach: Quarks & Gluons QCD Approach: Quarks & Gluons

FFF2 1978

Parton Distribution Functions Q2 dependence predicted from QCD

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MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 13

QCD Approach: Quarks & Gluons QCD Approach: Quarks & Gluons

FFF2 1978

Parton Distribution Functions Q2 dependence predicted from QCD Quark & Gluon Fragmentation Functions Q2 dependence predicted from QCD Quark & Gluon Cross-Sections Calculated from QCD Feynman quote from FFF2 “We investigate whether the present experimental behavior of mesons with large transverse momentum in hadron-hadron collisions is consistent with the theory of quantum-chromodynamics (QCD) with asymptotic freedom, at least as the theory is now partially understood.”

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MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 14

The The Fermilab Fermilab Tevatron Tevatron

I joined CDF in January 1998.

Proton AntiProton

2 TeV

Proton AntiProton 1 mile CDF

CDF “SciCo” Shift December 12-19, 2008

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MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 15

The The Fermilab Fermilab Tevatron Tevatron

I joined CDF in January 1998.

Proton AntiProton

2 TeV

Proton AntiProton 1 mile CDF

CDF “SciCo” Shift December 12-19, 2008

Acquired 4728 nb-1 during 8 hour “owl” shift!

My wife Jimmie on shift with me!

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MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 16

Traditional Approach Traditional Approach

Look at charged particle correlations in the azimuthal angle ∆φ

∆φ ∆φ ∆φ relative to a leading object (i.e. CaloJet#1, ChgJet#1, PTmax, Z-boson). For CDF PTmin = 0.5 GeV/c η η η ηcut = 1.0 or 0.8.

Charged Particle ∆φ ∆φ ∆φ ∆φ Correlations PT > PTmin |η η η η| < η η η ηcut

Leading Object Direction ∆φ ∆φ ∆φ ∆φ

“Toward”

“Transverse” “Transverse”

“Away”

Define |∆φ

∆φ ∆φ ∆φ| < 60o as “Toward”, 60o < |∆φ ∆φ ∆φ ∆φ| < 120o as “Transverse”, and |∆φ ∆φ ∆φ ∆φ| > 120o as “Away”.

• η

η η ηcut +η η η ηcut

φ φ φ φ

2π π π π η η η η Leading Object Toward Region Transverse Region Transverse Region Away Region Away Region

All three regions have the same area in η

η η η-φ φ φ φ space, ∆η ∆η ∆η ∆η×∆φ ∆φ ∆φ ∆φ = 2η η η ηcut×120o = 2η η η ηcut×2π π π π/3. Construct densities by dividing by the area in η η η η-φ φ φ φ space.

Charged Jet #1 Direction ∆φ ∆φ ∆φ ∆φ

“Transverse” “Transverse”

“Toward” “Away”

“Toward-Side” Jet “Away-Side” Jet

“Transverse” region very sensitive to the “underlying event”!

CDF Run 1 Analysis

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MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 17

Plot shows average “transverse” charge particle density (|η

η η η|<1, pT>0.5 GeV) versus PT(charged jet#1) compared to the QCD hard scattering predictions of ISAJET 7.32 (default parameters with PT(hard)>3 GeV/c) .

The predictions of ISAJET are divided into two categories: charged particles that arise from the

break-up of the beam and target (beam-beam remnants); and charged particles that arise from the

• utgoing jet plus initial and final-state radiation (hard scattering component).

Beam-Beam Remnants ISAJET

Charged Jet #1 Direction ∆φ ∆φ ∆φ ∆φ

“Toward”

“Transverse” “Transverse”

“Away”

“Hard” Component "Transverse" Charged Particle Density: dN/dη η η ηdφ φ φ φ

0.00 0.25 0.50 0.75 1.00 5 10 15 20 25 30 35 40 45 50

PT(charged jet#1) (GeV/c)

"Transverse" Charged Density

CDF Run 1Data

data uncorrected theory corrected

1.8 TeV |η η η η|<1.0 PT>0.5 GeV

Isajet

"Remnants" "Hard"

ISAJET 7.32 (without MPI) ISAJET 7.32 (without MPI) “ “Transverse Transverse” ” Density Density

ISAJET uses a naïve leading-log parton shower-model which does not agree with the data!

February 25, 2000

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MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 18

Plot shows average “transverse” charge particle density (|η

η η η|<1, pT>0.5 GeV) versus PT(charged jet#1) compared to the QCD hard scattering predictions of HERWIG 5.9 (default parameters with PT(hard)>3 GeV/c without MPI).

The predictions of HERWIG are divided into two categories: charged particles that arise from the

break-up of the beam and target (beam-beam remnants); and charged particles that arise from the

• utgoing jet plus initial and final-state radiation (hard scattering component).

Beam-Beam Remnants HERWIG

Charged Jet #1 Direction ∆φ ∆φ ∆φ ∆φ

“Toward”

“Transverse” “Transverse”

“Away”

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

0.00 0.25 0.50 0.75 1.00 5 10 15 20 25 30 35 40 45 50

PT(charged jet#1) (GeV/c)

"Transverse" Charged Density

CDF Run 1Data

data uncorrected theory corrected

1.8 TeV |η η η η|<1.0 PT>0.5 GeV

Herwig 6.4 CTEQ5L PT(hard) > 3 GeV/c

Total "Hard" "Remnants"

“Hard” Component

HERWIG 6.4 (without MPI) HERWIG 6.4 (without MPI) “ “Transverse Transverse” ” Density Density

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MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 19 The cut-off PT0 that regulates the 2-to-2 scattering divergence 1/PT4→1/(PT2+PT0

2)2

1.9 GeV/c PARP(82) A scale factor that determines the maximum parton virtuality for space-like showers. The larger the value of PARP(67) the more initial- state radiation. 1.0 PARP(67) Determines the energy dependence of the cut-off PT0 as follows PT0(Ecm) = PT0(Ecm/E0)ε

ε ε ε with

ε ε ε ε = PARP(90) 0.16 PARP(90) Double-Gaussian: Fraction of the overall hadron radius containing the fraction PARP(83) of the total hadronic matter. 0.2 PARP(84) Determines the reference energy E0. 1 TeV PARP(89) Probability that the MPI produces two gluons either as described by PARP(85) or as a closed gluon loop. The remaining fraction consists of quark-antiquark pairs. 0.66 PARP(86) Probability that the MPI produces two gluons with color connections to the “nearest neighbors. 0.33 PARP(85) Double-Gaussian: Fraction of total hadronic matter within PARP(84) 0.5 PARP(83) Description Default Parameter H a r d C

• r

e

Multiple Parton Interaction

Color String Color String

Multiple Parton Interaction

Color String Hard-Scattering Cut-Off PT0

1 2 3 4 5 100 1,000 10,000 100,000 CM Energy W (GeV)

PT0 (GeV/c)

PYTHIA 6.206 ε ε ε ε = 0.16 (default) ε ε ε ε = 0.25 (Set A))

Take E0 = 1.8 TeV Reference point at 1.8 TeV Determine by comparing with 630 GeV data! Affects the amount of initial-state radiation!

Tuning PYTHIA 6.2: Tuning PYTHIA 6.2:

Multiple Parton Interaction Parameters Multiple Parton Interaction Parameters

Determines the energy dependence of the MPI!

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MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 20

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

0.00 0.25 0.50 0.75 1.00 5 10 15 20 25 30 35 40 45 50

PT(charged jet#1) (GeV/c)

"Transverse" Charged Density CTEQ3L CTEQ4L CTEQ5L CDF Min-Bias CDF JET20 1.8 TeV |η η η η|<1.0 PT>0.5 GeV Pythia 6.206 (default) MSTP(82)=1 PARP(81) = 1.9 GeV/c

CDF Data

data uncorrected theory corrected

Default parameters give very poor description of the “underlying event”!

Note Change PARP(67) = 4.0 (< 6.138) PARP(67) = 1.0 (> 6.138)

0.16 0.16 0.16 PARP(90) 1,000 1,000 1,000 PARP(89) 4.0 2.1 1.9 1 1 6.125 1.0 2.1 1.9 1 1 6.158 1.0 4.0 PARP(67) 1.9 1.55 PARP(82) 1.9 1.4 PARP(81) 1 1 MSTP(82) 1 1 MSTP(81) 6.206 6.115 Parameter

Plot shows the “Transverse” charged particle density versus PT(chgjet#1) compared to the

QCD hard scattering predictions of PYTHIA 6.206 (PT(hard) > 0) using the default parameters for multiple parton interactions and CTEQ3L, CTEQ4L, and CTEQ5L. PYTHIA default parameters

PYTHIA 6.206 Defaults PYTHIA 6.206 Defaults

MPI constant probability scattering

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MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 21 Old PYTHIA default (more initial-state radiation) New PYTHIA default (less initial-state radiation)

0.5 0.5 PARP(83) 0.4 0.4 PARP(84) 0.25 0.25 PARP(90) 0.95 1.0 PARP(86) 1.8 TeV 1.8 TeV PARP(89) 4.0 0.9 2.0 GeV 4 1 Tune A 1.0 PARP(67) 1.0 PARP(85) 1.9 GeV PARP(82) 4 MSTP(82) 1 MSTP(81) Tune B Parameter

Old PYTHIA default (more initial-state radiation) New PYTHIA default (less initial-state radiation)

Plot shows the “transverse” charged particle density

versus PT(chgjet#1) compared to the QCD hard scattering predictions of two tuned versions of PYTHIA 6.206 (CTEQ5L, Set B (PARP(67)=1) and Set A (PARP(67)=4)).

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

0.00 0.25 0.50 0.75 1.00 5 10 15 20 25 30 35 40 45 50

PT(charged jet#1) (GeV/c)

"Transverse" Charged Density 1.8 TeV |η η η η|<1.0 PT>0.5 GeV

CDF Preliminary

data uncorrected theory corrected

CTEQ5L

PYTHIA 6.206 (Set A) PARP(67)=4 PYTHIA 6.206 (Set B) PARP(67)=1

Run 1 Analysis

Run 1 PYTHIA Tune A Run 1 PYTHIA Tune A

PYTHIA 6.206 CTEQ5L

CDF Default Feburary 25, 2000!

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MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 22

“ “Transverse Transverse” ” Charged Densities Charged Densities

Energy Dependence Energy Dependence

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

0.00 0.20 0.40 0.60 5 10 15 20 25 30 35 40 45 50

PT(charged jet#1) (GeV/c)

Charged PTsum Density (GeV)

Pythia 6.206 (Set A)

630 GeV |η η η η|<1.0 PT>0.4 GeV CTEQ5L HERWIG 6.4 ε ε ε ε = 0.25 ε ε ε ε = 0 ε ε ε ε = 0.16

"Min Transverse" PTsum Density: dPTsum/dη η η ηdφ φ φ φ

0.0 0.1 0.2 0.3 5 10 15 20 25 30 35 40 45 50

PT(charged jet#1) (GeV/c)

Charged PTsum Density (GeV) 630 GeV |η η η η|<1.0 PT>0.4 GeV ε ε ε ε = 0.25 HERWIG 6.4 ε ε ε ε = 0.16 ε ε ε ε = 0 CTEQ5L

Pythia 6.206 (Set A)

Shows the “transverse” charged PTsum density

(|η η η η|<1, PT>0.4 GeV) versus PT(charged jet#1) at 630 GeV predicted by HERWIG 6.4 (PT(hard) > 3 GeV/c, CTEQ5L) and a tuned version of PYTHIA 6.206 (PT(hard) > 0, CTEQ5L, Set A, ε ε ε ε = 0, ε ε ε ε = 0.16 (default) and ε ε ε ε = 0.25 (preferred)).

Also shown are the PTsum densities (0.16 GeV/c and

0.54 GeV/c) determined from the Tano, Kovacs, Huston, and Bhatti “transverse” cone analysis at 630 GeV.

Hard-Scattering Cut-Off PT0

1 2 3 4 5 100 1,000 10,000 100,000 CM Energy W (GeV)

PT0 (GeV/c)

PYTHIA 6.206 ε ε ε ε = 0.16 (default) ε ε ε ε = 0.25 (Set A))

Reference point E0 = 1.8 TeV

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MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 23

“ “Transverse Transverse” ” Charged Densities Charged Densities

Energy Dependence Energy Dependence

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

0.00 0.20 0.40 0.60 5 10 15 20 25 30 35 40 45 50

PT(charged jet#1) (GeV/c)

Charged PTsum Density (GeV)

Pythia 6.206 (Set A)

630 GeV |η η η η|<1.0 PT>0.4 GeV CTEQ5L HERWIG 6.4 ε ε ε ε = 0.25 ε ε ε ε = 0 ε ε ε ε = 0.16

"Min Transverse" PTsum Density: dPTsum/dη η η ηdφ φ φ φ

0.0 0.1 0.2 0.3 5 10 15 20 25 30 35 40 45 50

PT(charged jet#1) (GeV/c)

Charged PTsum Density (GeV) 630 GeV |η η η η|<1.0 PT>0.4 GeV ε ε ε ε = 0.25 HERWIG 6.4 ε ε ε ε = 0.16 ε ε ε ε = 0 CTEQ5L

Pythia 6.206 (Set A)

Shows the “transverse” charged PTsum density

(|η η η η|<1, PT>0.4 GeV) versus PT(charged jet#1) at 630 GeV predicted by HERWIG 6.4 (PT(hard) > 3 GeV/c, CTEQ5L) and a tuned version of PYTHIA 6.206 (PT(hard) > 0, CTEQ5L, Set A, ε ε ε ε = 0, ε ε ε ε = 0.16 (default) and ε ε ε ε = 0.25 (preferred)).

Also shown are the PTsum densities (0.16 GeV/c and

0.54 GeV/c) determined from the Tano, Kovacs, Huston, and Bhatti “transverse” cone analysis at 630 GeV.

Hard-Scattering Cut-Off PT0

1 2 3 4 5 100 1,000 10,000 100,000 CM Energy W (GeV)

PT0 (GeV/c)

PYTHIA 6.206 ε ε ε ε = 0.16 (default) ε ε ε ε = 0.25 (Set A))

Lowering PT0 at 630 GeV (i.e. increasing ε ε ε ε) increases UE activity resulting in less energy dependence. Increasing ε ε ε ε produces less energy dependence for the UE resulting in less UE activity at the LHC! Reference point E0 = 1.8 TeV

Rick Field Fermilab MC Workshop October 4, 2002!

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MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 24

Early Studies of the UE Early Studies of the UE

DPF 2000: My first presentation

• n the “underlying event”!

First CDF UE Studies Rick Field Wine & Cheese Talk October 4, 2002

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MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 25

My First Talk on the UE My First Talk on the UE

My first look at the “underlying event plateau”! Need to “tune” the QCD MC models!

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MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 26

Other Early UE Talks Other Early UE Talks

Workshop on Physics at TeV Colliders, Les Houches, May 30, 2001.

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MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 27

Other Early UE Talks Other Early UE Talks

Workshop on Physics at TeV Colliders, Les Houches, May 30, 2001. Cambridge Workshop on TeV-Scale Physics, July 20, 2002.

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MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 28

Other Early UE Talks Other Early UE Talks

Workshop on Physics at TeV Colliders, Les Houches, May 30, 2001. Cambridge Workshop on TeV-Scale Physics, July 20, 2002. HERA and the LHC Workshop, CERN, October 11, 2004.

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KITP Collider Workshop 2004 KITP Collider Workshop 2004

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MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 30

KITP Collider Workshop 2004 KITP Collider Workshop 2004

Together with Torbjörn Sjöstrand and his graduate student Peter Skands!

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MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 31

• 1

+1

φ φ φ φ

2π π π π η η η η Leading Jet Toward Region Transverse Region 1 Transverse Region 2 Away Region Away Region

“ “Transverse Transverse” ”Particle Particle Densities Densities

Study the charged particles (pT > 0.5 GeV/c, |η

η η η| < 1) in the “Transverse 1” and “Transverse 2” and form the charged particle density, dNchg/dη η η ηdφ φ φ φ, and the charged scalar pT sum density, dPTsum/dη η η ηdφ φ φ φ.

Charged Particles pT > 0.5 GeV/c |η η η η| < 1

1 charged particle in the “transverse 2” region

dNchg/dη η η ηdφ φ φ φ = 1/(4π/6) π/6) π/6) π/6) = 0.48 Jet #1 Direction ∆φ ∆φ ∆φ ∆φ

“Toward” “Trans 1” “Trans 2” “Away”

Area = 4π π π π/6

The average “transverse” density is the average of “transverse 1” and “transverse 2”.

AVE “transverse” (Trans 1 + Trans 2)/2

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Charged Particle Density Charged Particle Density ∆φ ∆φ ∆φ ∆φ ∆φ ∆φ ∆φ ∆φ Dependence Dependence

Shows the ∆φ

∆φ ∆φ ∆φ dependence of the charged particle density, dNchg/dη η η ηdφ φ φ φ, for charged particles in the range pT > 0.5 GeV/c and |η η η η| < 1 relative to jet#1 (rotated to 270o) for “leading jet” events 30 < ET(jet#1) < 70 GeV.

Also shows charged particle density, dNchg/dη

η η ηdφ φ φ φ, for charged particles in the range pT > 0.5 GeV/c and |η η η η| < 1 for “min-bias” collisions.

Leading Jet

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

0.1 1.0 10.0 30 60 90 120 150 180 210 240 270 300 330 360

∆φ ∆φ ∆φ ∆φ (degrees)

Charged Particle Density

CDF Preliminary

data uncorrected

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

30 < ET(jet#1) < 70 GeV

"Transverse" Region Jet#1

Jet #1 Direction ∆φ ∆φ ∆φ ∆φ

“Transverse” “Transverse”

“Toward” “Away”

“Toward-Side” Jet “Away-Side” Jet

Min-Bias 0.25 per unit η η η η-φ φ φ φ Log Scale!

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MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 33

Charged Particle Density Charged Particle Density ∆φ ∆φ ∆φ ∆φ ∆φ ∆φ ∆φ ∆φ Dependence Dependence

Shows the ∆φ

∆φ ∆φ ∆φ dependence of the charged particle density, dNchg/dη η η ηdφ φ φ φ, for charged particles in the range pT > 0.5 GeV/c and |η η η η| < 1 relative to jet#1 (rotated to 270o) for “leading jet” events 30 < ET(jet#1) < 70 GeV.

Also shows charged particle density, dNchg/dη

η η ηdφ φ φ φ, for charged particles in the range pT > 0.5 GeV/c and |η η η η| < 1 for “min-bias” collisions.

Leading Jet

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

0.1 1.0 10.0 30 60 90 120 150 180 210 240 270 300 330 360

∆φ ∆φ ∆φ ∆φ (degrees)

Charged Particle Density

CDF Preliminary

data uncorrected

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

30 < ET(jet#1) < 70 GeV

"Transverse" Region Jet#1

Jet #1 Direction ∆φ ∆φ ∆φ ∆φ

“Transverse” “Transverse”

“Toward” “Away”

“Toward-Side” Jet “Away-Side” Jet

Jet #1 Direction ∆φ ∆φ ∆φ ∆φ

“Transverse” “Transverse”

“Toward” “Away”

“Toward-Side” Jet “Away-Side” Jet Jet #3

Min-Bias 0.25 per unit η η η η-φ φ φ φ Log Scale!

SLIDE 34

MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 34

Charged Particle Density Charged Particle Density ∆φ ∆φ ∆φ ∆φ ∆φ ∆φ ∆φ ∆φ Dependence Dependence

Look at the “transverse” region as defined by the leading jet (JetClu R = 0.7, |η

η η η| < 2) or by the leading two jets (JetClu R = 0.7, |η η η η| < 2). “Back-to-Back” events are selected to have at least two jets with Jet#1 and Jet#2 nearly “back-to-back” (∆φ ∆φ ∆φ ∆φ12 > 150o) with almost equal transverse energies (ET(jet#2)/ET(jet#1) > 0.8).

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

0.1 1.0 10.0 30 60 90 120 150 180 210 240 270 300 330 360

∆φ ∆φ ∆φ ∆φ (degrees)

Charged Particle Density

CDF Preliminary

data uncorrected

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

30 < ET(jet#1) < 70 GeV

"Transverse" Region Jet#1 Jet #1 Direction ∆φ ∆φ ∆φ ∆φ

“Toward”

“Transverse” “Transverse”

“Away”

Jet #1 Direction ∆φ ∆φ ∆φ ∆φ

“Toward”

“Transverse” “Transverse”

“Away”

Jet #2 Direction

Shows the ∆φ

∆φ ∆φ ∆φ dependence of the charged particle density, dNchg/dη η η ηdφ φ φ φ, for charged particles in the range pT > 0.5 GeV/c and |η η η η| < 1 relative to jet#1 (rotated to 270o) for 30 < ET(jet#1) < 70 GeV for “Leading Jet” and “Back-to-Back” events.

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

0.1 1.0 10.0 30 60 90 120 150 180 210 240 270 300 330 360

∆φ ∆φ ∆φ ∆φ (degrees)

Charged Particle Density

Back-to-Back Leading Jet Min-Bias

CDF Preliminary

data uncorrected

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

30 < ET(jet#1) < 70 GeV

"Transverse" Region Jet#1

Refer to this as a “Leading Jet” event Refer to this as a “Back-to-Back” event Subset

SLIDE 35

MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 35

Charged Particle Density Charged Particle Density ∆φ ∆φ ∆φ ∆φ ∆φ ∆φ ∆φ ∆φ Dependence Dependence

Jet #1 Direction ∆φ ∆φ ∆φ ∆φ

“Toward”

“Transverse” “Transverse”

“Away”

Jet #1 Direction ∆φ ∆φ ∆φ ∆φ

“Toward”

“Transverse” “Transverse”

“Away”

Jet #2 Direction

Shows the ∆φ

∆φ ∆φ ∆φ dependence of the charged particle density, dNchg/dη η η ηdφ φ φ φ, for charged particles in the range pT > 0.5 GeV/c and |η η η η| < 1 relative to jet#1 (rotated to 270o) for 30 < ET(jet#1) < 70 GeV for “Leading Jet” and “Back-to-Back” events.

“Leading Jet” “Back-to-Back”

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

272 276 280 284 288 292 296 300 304 308 312 316 320 324 328 332 336 340 344 348 352 356 360 4 8 12 16 20 24 28 32 36 40 44 48 52 56 60 64 68 72 76 80 84 88 92 96 100 104 108 112 116 120 124 128 132 136 140 144 148 152 156 160 164 168 172 176 180 184 188 192 196 200 204 208 212 216 220 224 228 232 236 240 244 248 252 256 260 264 268

CDF Preliminary

data uncorrected

30 < ET(jet#1) < 70 GeV

Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) "Transverse" Region "Transverse" Region Jet#1 Back-to-Back Leading Jet 0.5 1.0 1.5 2.0

Polar Plot

SLIDE 36

MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 36

“ “Transverse Transverse” ” PTsum PTsum Density Density PYTHIA Tune A PYTHIA Tune A vs vs HERWIG HERWIG

Jet #1 Direction ∆φ ∆φ ∆φ ∆φ

“Toward”

“Transverse” “Transverse”

“Away”

Jet #1 Direction ∆φ ∆φ ∆φ ∆φ

“Toward”

“Transverse” “Transverse”

“Away”

Jet #2 Direction

Shows the average charged PTsum density, dPTsum/dη

η η ηdφ φ φ φ, in the “transverse” region (pT > 0.5 GeV/c, |η η η η| < 1) versus ET(jet#1) for “Leading Jet” and “Back-to-Back” events.

Compares the (uncorrected) data with PYTHIA Tune A and HERWIG (no MPI) after

CDFSIM.

“Leading Jet” “Back-to-Back”

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

0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 50 100 150 200 250

ET(jet#1) (GeV)

"Transverse" PTsum Density (GeV/c)

CDF Preliminary

data uncorrected theory + CDFSIM

Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) Back-to-Back Leading Jet PY Tune A HW

1.96 TeV

Now look in detail at “back-to-back” events in the region 30 < ET(jet#1) < 70 GeV!

SLIDE 37

MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 37

Charged Charged PTsum PTsum Density Density PYTHIA Tune A PYTHIA Tune A vs vs HERWIG HERWIG

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

0.1 1.0 10.0 100.0 30 60 90 120 150 180 210 240 270 300 330 360

∆φ ∆φ ∆φ ∆φ (degrees)

Charged PTsum Density (GeV/c)

Back-to-Back PY Tune A

30 < ET(jet#1) < 70 GeV

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

CDF Preliminary

data uncorrected theory + CDFSIM

Jet#1 "Transverse" Region

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

0.1 1.0 10.0 100.0 30 60 90 120 150 180 210 240 270 300 330 360

∆φ ∆φ ∆φ ∆φ (degrees)

Charged PTsum Density (GeV/c)

Back-to-Back HERWIG

30 < ET(jet#1) < 70 GeV

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

CDF Preliminary

data uncorrected theory + CDFSIM

Jet#1 "Transverse" Region

Data - Theory: Charged PTsum Density dPT/dη η η ηdφ φ φ φ

• 2
• 1

1 2 30 60 90 120 150 180 210 240 270 300 330 360

∆φ ∆φ ∆φ ∆φ (degrees)

Data - Theory (GeV/c)

CDF Preliminary

data uncorrected theory + CDFSIM

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

Back-to-Back 30 < ET(jet#1) < 70 GeV PYTHIA Tune A

Jet#1 "Transverse" Region

Data - Theory: Charged PTsum Density dPT/dη η η ηdφ φ φ φ

• 2
• 1

1 2 30 60 90 120 150 180 210 240 270 300 330 360

∆φ ∆φ ∆φ ∆φ (degrees)

Data - Theory (GeV/c)

CDF Preliminary

data uncorrected theory + CDFSIM

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

30 < ET(jet#1) < 70 GeV Back-to-Back HERWIG

Jet#1 "Transverse" Region

SLIDE 38

MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 38

Charged Charged PTsum PTsum Density Density PYTHIA Tune A PYTHIA Tune A vs vs HERWIG HERWIG

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

0.1 1.0 10.0 100.0 30 60 90 120 150 180 210 240 270 300 330 360

∆φ ∆φ ∆φ ∆φ (degrees)

Charged PTsum Density (GeV/c)

Back-to-Back PY Tune A

30 < ET(jet#1) < 70 GeV

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

CDF Preliminary

data uncorrected theory + CDFSIM

Jet#1 "Transverse" Region

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

0.1 1.0 10.0 100.0 30 60 90 120 150 180 210 240 270 300 330 360

∆φ ∆φ ∆φ ∆φ (degrees)

Charged PTsum Density (GeV/c)

Back-to-Back HERWIG

30 < ET(jet#1) < 70 GeV

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

CDF Preliminary

data uncorrected theory + CDFSIM

Jet#1 "Transverse" Region

Data - Theory: Charged PTsum Density dPT/dη η η ηdφ φ φ φ

• 2
• 1

1 2 30 60 90 120 150 180 210 240 270 300 330 360

∆φ ∆φ ∆φ ∆φ (degrees)

Data - Theory (GeV/c)

CDF Preliminary

data uncorrected theory + CDFSIM

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

Back-to-Back 30 < ET(jet#1) < 70 GeV PYTHIA Tune A

Jet#1 "Transverse" Region

Data - Theory: Charged PTsum Density dPT/dη η η ηdφ φ φ φ

• 2
• 1

1 2 30 60 90 120 150 180 210 240 270 300 330 360

∆φ ∆φ ∆φ ∆φ (degrees)

Data - Theory (GeV/c)

CDF Preliminary

data uncorrected theory + CDFSIM

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

30 < ET(jet#1) < 70 GeV Back-to-Back HERWIG

Jet#1 "Transverse" Region

HERWIG (without multiple parton interactions) does not produces enough PTsum in the “transverse” region for 30 < ET(jet#1) < 70 GeV!

SLIDE 39

MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 39

Back Back-

• to

to-

• Back

Back “ “Associated Associated” ” Charged Particle Densities Charged Particle Densities

Use the leading jet in “back-to-back” events to define the “transverse” region and look at

the maximum pT charged particle in the “transverse” region, PTmaxT.

“Associated” densities do not include PTmaxT!

Jet #1 Direction ∆φ ∆φ ∆φ ∆φ

“Toward”

“TransMIN” “TransMAX”

PTmaxT Jet #2 Direction

“Away”

∆φ ∆φ ∆φ ∆φ Jet#1 Region PTmaxT Direction Jet#2 Region ∆φ ∆φ ∆φ ∆φ PTmaxT Direction Jet#1 Region Jet#2 Region

Look at the ∆φ

∆φ ∆φ ∆φ dependence of the “associated” charged particle and PTsum densities, dNchg/dη η η ηdφ φ φ φ and dPTsum/dη η η ηdφ φ φ φ for charged particles (pT > 0.5 GeV/c, |η η η η| < 1, not including PTmaxT) relative to PTmaxT.

Rotate so that PTmaxT is at the center of the plot (i.e. 180o).

Maximum pT particle in the “transverse” region!

SLIDE 40

MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 40

Back Back-

• to

to-

• Back

Back “ “Associated Associated” ” Charged Particle Density Charged Particle Density

∆φ ∆φ ∆φ ∆φ PTmaxT Direction Jet#1 Region Jet#2 Region

Look at the ∆φ

∆φ ∆φ ∆φ dependence of the “associated” charged particle density, dNchg/dη η η ηdφ φ φ φ for charged particles (pT > 0.5 GeV/c, |η η η η| < 1, not including PTmaxT) relative to PTmaxT (rotated to 180o) for PTmaxT > 0.5 GeV/c, PTmaxT > 1.0 GeV/c and PTmaxT > 2.0 GeV/c, for “back-to-back” events with 30 < ET(jet#1) < 70 GeV.

Shows “jet structure” in the “transverse” region (i.e. the “birth” of the 3rd & 4th jet).

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

0.1 1.0 10.0 30 60 90 120 150 180 210 240 270 300 330 360

∆φ ∆φ ∆φ ∆φ (degrees)

Associated Particle Density

PTmaxT > 2.0 GeV/c PTmaxT > 1.0 GeV/c PTmaxT > 0.5 GeV/c

CDF Preliminary

data uncorrected

PTmaxT

Back-to-Back 30 < ET(jet#1) < 70 GeV

Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) PTmaxT not included "Jet#1" Region Jet#2 Region

“Associated” densities do not include PTmaxT! Log Scale! ??

SLIDE 41

MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 41

Back Back-

• to

to-

• Back

Back “ “Associated Associated” ” Charged Particle Density Charged Particle Density

∆φ ∆φ ∆φ ∆φ PTmaxT Direction Jet#1 Region Jet#2 Region

Look at the ∆φ

∆φ ∆φ ∆φ dependence of the “associated” charged particle density, dNchg/dη η η ηdφ φ φ φ for charged particles (pT > 0.5 GeV/c, |η η η η| < 1, not including PTmaxT) relative to PTmaxT (rotated to 180o) for PTmaxT > 0.5 GeV/c, PTmaxT > 1.0 GeV/c and PTmaxT > 2.0 GeV/c, for “back-to-back” events with 30 < ET(jet#1) < 70 GeV.

Shows “jet structure” in the “transverse” region (i.e. the “birth” of the 3rd & 4th jet).

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

0.1 1.0 10.0 30 60 90 120 150 180 210 240 270 300 330 360

∆φ ∆φ ∆φ ∆φ (degrees)

Associated Particle Density

PTmaxT > 2.0 GeV/c PTmaxT > 1.0 GeV/c PTmaxT > 0.5 GeV/c

CDF Preliminary

data uncorrected

PTmaxT

Back-to-Back 30 < ET(jet#1) < 70 GeV

Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) PTmaxT not included "Jet#1" Region Jet#2 Region

Jet #1 Jet #2

Jet #4

“Associated” densities do not include PTmaxT! Jet #3 Log Scale! ??

SLIDE 42

MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 42

Back Back-

• to

to-

• Back

Back “ “Associated Associated” ” Charged Particle Densities Charged Particle Densities

∆φ ∆φ ∆φ ∆φ Jet#1 Region PTmaxT Direction Jet#2 Region

Shows the ∆φ

∆φ ∆φ ∆φ dependence of the “associated” charged particle density, dNchg/dη η η ηdφ φ φ φ, pT > 0.5 GeV/c, |η η η η| < 1 (not including PTmaxT) relative to PTmaxT (rotated to 180o) and the charged particle density, dNchg/dη η η ηdφ φ φ φ, pT > 0.5 GeV/c, |η η η η| < 1 relative to jet#1 (rotated to 270o) for “back-to-back events” with 30 < ET(jet#1) < 70 GeV.

Jet #1 Direction ∆φ ∆φ ∆φ ∆φ

“Toward”

“Transverse” “Transverse”

“Away”

Jet #2 Direction

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

2 6 10 14 18 22 26 30 34 38 42 46 50 54 58 62 66 70 74 78 82 86 90 94 98 102 106 110 114 118 122 126 130 134 138 142 146 150 154 158 162 166 170 174 178 182 186 190 194 198 202 206 210 214 218 222 226 230 234 238 242 246 250 254 258 262 266 270 274 278 282 286 290 294 298 302 306 310 314 318 322 326 330 334 338 342 346 350 354 358

CDF Preliminary

data uncorrected

30 < ET(jet#1) < 70 GeV Back-to-Back

Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) "Transverse" Region "Transverse" Region Jet#1 Associated Density PTmaxT not included PTmaxT

Polar Plot

0.5 1.0 1.5 2.0

“Back-to-Back” charge density “Back-to-Back” “associated” density

SLIDE 43

MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 43

Back Back-

• to

to-

• Back

Back “ “Associated Associated” ” Charged Particle Densities Charged Particle Densities

∆φ ∆φ ∆φ ∆φ Jet#1 Region PTmaxT Direction Jet#2 Region

Shows the ∆φ

∆φ ∆φ ∆φ dependence of the “associated” charged particle density, dNchg/dη η η ηdφ φ φ φ, pT > 0.5 GeV/c, |η η η η| < 1, PTmaxT > 2.0 GeV/c (not including PTmaxT) relative to PTmaxT (rotated to 180o) and the charged particle density, dNchg/dη η η ηdφ φ φ φ, pT > 0.5 GeV/c, |η η η η| < 1, relative to jet#1 (rotated to 270o) for “back-to-back events” with 30 < ET(jet#1) < 70 GeV.

Jet #1 Direction ∆φ ∆φ ∆φ ∆φ

“Toward”

“Transverse” “Transverse”

“Away”

Jet #2 Direction

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

2 6 10 14 18 22 26 30 34 38 42 46 50 54 58 62 66 70 74 78 82 86 90 94 98 102 106 110 114 118 122 126 130 134 138 142 146 150 154 158 162 166 170 174 178 182 186 190 194 198 202 206 210 214 218 222 226 230 234 238 242 246 250 254 258 262 266 270 274 278 282 286 290 294 298 302 306 310 314 318 322 326 330 334 338 342 346 350 354 358

CDF Preliminary

data uncorrected

30 < ET(jet#1) < 70 GeV Back-to-Back

Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) "Transverse" Region "Transverse" Region Jet#1 Associated Density PTmaxT > 2 GeV/c (not included) PTmaxT

Polar Plot “Back-to-Back” “associated” density “Back-to-Back” charge density

0.5 1.0 1.5 2.0

SLIDE 44

MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 44

Back Back-

• to

to-

• Back

Back “ “Associated Associated” ” Charged Particle Density Charged Particle Density

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

0.1 1.0 10.0 30 60 90 120 150 180 210 240 270 300 330 360

∆φ ∆φ ∆φ ∆φ (degrees)

Associated Particle Density

95 < ET(jet#1) < 130 GeV 30 < ET(jet#1) < 70 GeV Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c)

CDF Preliminary

data uncorrected

PTmaxT PTmaxT > 2.0 GeV/c (not included) "Jet#1" Region

Back-to-Back

∆φ ∆φ ∆φ ∆φ PTmaxT Direction Jet#1 Region Jet#2 Region

Look at the ∆φ

∆φ ∆φ ∆φ dependence of the “associated” charged particle density, dNchg/dη η η ηdφ φ φ φ, pT > 0.5 GeV/c, |η η η η| < 1 (not including PTmaxT) relative to PTmaxT (rotated to 180o) for PTmaxT > 2.0 GeV/c for “back-to-back” events with 30 < ET(jet#1) < 70 GeV and 95 < ET(jet#1) < 130 GeV.

Jet#2 Region

Very little dependence on ET(jet#1) in the “transverse” region for “back-to-back” events!

Log Scale!

SLIDE 45

MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 45

“ “Associated Associated” ” PTsum PTsum Density Density PYTHIA Tune A PYTHIA Tune A vs vs HERWIG HERWIG

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

0.1 1.0 10.0 30 60 90 120 150 180 210 240 270 300 330 360

∆φ ∆φ ∆φ ∆φ (degrees)

Associated PTsum Density (GeV/c)

PTmaxT > 0.5 GeV/c PY Tune A

Back-to-Back 30 < ET(jet#1) < 70 GeV

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

CDF Preliminary

data uncorrected theory + CDFSIM

PTmaxT "Jet#1" Region PTmaxT not included

Data - Theory: Associated PTsum Density dPT/dη η η ηdφ φ φ φ

• 2
• 1

1 2 30 60 90 120 150 180 210 240 270 300 330 360

∆φ ∆φ ∆φ ∆φ (degrees)

Data - Theory (GeV/c)

CDF Preliminary

data uncorrected theory + CDFSIM

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

Back-to-Back 30 < ET(jet#1) < 70 GeV PYTHIA Tune A

PTmaxT PTmaxT not included "Jet#1" Region

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

0.1 1.0 10.0 30 60 90 120 150 180 210 240 270 300 330 360

∆φ ∆φ ∆φ ∆φ (degrees)

Associated PTsum Density (GeV/c)

PTmaxT > 0.5 GeV/c HERWIG

Back-to-Back 30 < ET(jet#1) < 70 GeV

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

CDF Preliminary

data uncorrected theory + CDFSIM

PTmaxT "Jet#1" Region PTmaxT not included

Data - Theory: Associated PTsum Density dPT/dη η η ηdφ φ φ φ

• 2
• 1

1 2 30 60 90 120 150 180 210 240 270 300 330 360

∆φ ∆φ ∆φ ∆φ (degrees)

Data - Theory (GeV/c)

CDF Preliminary

data uncorrected theory + CDFSIM

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

Back-to-Back 30 < ET(jet#1) < 70 GeV HERWIG

PTmaxT PTmaxT not included "Jet#1" Region

PTmaxT > 0.5 GeV/c

SLIDE 46

MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 46

“ “Associated Associated” ” PTsum PTsum Density Density PYTHIA Tune A PYTHIA Tune A vs vs HERWIG HERWIG

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

0.1 1.0 10.0 30 60 90 120 150 180 210 240 270 300 330 360

∆φ ∆φ ∆φ ∆φ (degrees)

Associated PTsum Density (GeV/c)

PTmaxT > 0.5 GeV/c PY Tune A

Back-to-Back 30 < ET(jet#1) < 70 GeV

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

CDF Preliminary

data uncorrected theory + CDFSIM

PTmaxT "Jet#1" Region PTmaxT not included

Data - Theory: Associated PTsum Density dPT/dη η η ηdφ φ φ φ

• 2
• 1

1 2 30 60 90 120 150 180 210 240 270 300 330 360

∆φ ∆φ ∆φ ∆φ (degrees)

Data - Theory (GeV/c)

CDF Preliminary

data uncorrected theory + CDFSIM

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

Back-to-Back 30 < ET(jet#1) < 70 GeV PYTHIA Tune A

PTmaxT PTmaxT not included "Jet#1" Region

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

0.1 1.0 10.0 30 60 90 120 150 180 210 240 270 300 330 360

∆φ ∆φ ∆φ ∆φ (degrees)

Associated PTsum Density (GeV/c)

PTmaxT > 0.5 GeV/c HERWIG

Back-to-Back 30 < ET(jet#1) < 70 GeV

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

CDF Preliminary

data uncorrected theory + CDFSIM

PTmaxT "Jet#1" Region PTmaxT not included

Data - Theory: Associated PTsum Density dPT/dη η η ηdφ φ φ φ

• 2
• 1

1 2 30 60 90 120 150 180 210 240 270 300 330 360

∆φ ∆φ ∆φ ∆φ (degrees)

Data - Theory (GeV/c)

CDF Preliminary

data uncorrected theory + CDFSIM

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

Back-to-Back 30 < ET(jet#1) < 70 GeV HERWIG

PTmaxT PTmaxT not included "Jet#1" Region

HERWIG (without multiple parton interactions) does not produce enough “associated” PTsum in the direction of PTmaxT! And HERWIG (without multiple parton interactions) does not produce enough PTsum in the direction opposite of PTmaxT! PTmaxT > 0.5 GeV/c

SLIDE 47

MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 47

“ “Associated Associated” ” PTsum PTsum Density Density PYTHIA Tune A PYTHIA Tune A vs vs HERWIG HERWIG

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

0.1 1.0 10.0 30 60 90 120 150 180 210 240 270 300 330 360

∆φ ∆φ ∆φ ∆φ (degrees)

Associated PTsum Density (GeV/c)

PTmaxT > 2.0 GeV/c PY Tune A

Back-to-Back 30 < ET(jet#1) < 70 GeV

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

CDF Preliminary

data uncorrected theory + CDFSIM

PTmaxT "Jet#1" Region PTmaxT not included

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

0.1 1.0 10.0 30 60 90 120 150 180 210 240 270 300 330 360

∆φ ∆φ ∆φ ∆φ (degrees)

Associated PTsum Density (GeV/c)

PTmaxT > 2.0 GeV/c HERWIG

Back-to-Back 30 < ET(jet#1) < 70 GeV

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

CDF Preliminary

data uncorrected theory + CDFSIM

PTmaxT "Jet#1" Region PTmaxT not included

Data - Theory: Associated Particle Density dN/dη η η ηdφ φ φ φ

• 2.0
• 1.0

0.0 1.0 2.0 30 60 90 120 150 180 210 240 270 300 330 360

∆φ ∆φ ∆φ ∆φ (degrees)

Data - Theory

CDF Preliminary

data uncorrected theory + CDFSIM

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

Back-to-Back 30 < ET(jet#1) < 70 GeV PYTHIA Tune A

PTmaxT "Jet#1" Region PTmaxT > 2.0 GeV/c (not included)

Data - Theory: Associated Particle Density dN/dη η η ηdφ φ φ φ

• 2
• 1

1 2 30 60 90 120 150 180 210 240 270 300 330 360

∆φ ∆φ ∆φ ∆φ (degrees)

Data - Theory

CDF Preliminary

data uncorrected theory + CDFSIM

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

Back-to-Back 30 < ET(jet#1) < 70 GeV HERWIG

PTmaxT "Jet#1" Region PTmaxT > 2.0 GeV/c (not included)

PTmaxT > 2 GeV/c

SLIDE 48

MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 48

“ “Associated Associated” ” PTsum PTsum Density Density PYTHIA Tune A PYTHIA Tune A vs vs HERWIG HERWIG

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

0.1 1.0 10.0 30 60 90 120 150 180 210 240 270 300 330 360

∆φ ∆φ ∆φ ∆φ (degrees)

Associated PTsum Density (GeV/c)

PTmaxT > 2.0 GeV/c PY Tune A

Back-to-Back 30 < ET(jet#1) < 70 GeV

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

CDF Preliminary

data uncorrected theory + CDFSIM

PTmaxT "Jet#1" Region PTmaxT not included

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

0.1 1.0 10.0 30 60 90 120 150 180 210 240 270 300 330 360

∆φ ∆φ ∆φ ∆φ (degrees)

Associated PTsum Density (GeV/c)

PTmaxT > 2.0 GeV/c HERWIG

Back-to-Back 30 < ET(jet#1) < 70 GeV

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

CDF Preliminary

data uncorrected theory + CDFSIM

PTmaxT "Jet#1" Region PTmaxT not included

Data - Theory: Associated Particle Density dN/dη η η ηdφ φ φ φ

• 2.0
• 1.0

0.0 1.0 2.0 30 60 90 120 150 180 210 240 270 300 330 360

∆φ ∆φ ∆φ ∆φ (degrees)

Data - Theory

CDF Preliminary

data uncorrected theory + CDFSIM

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

Back-to-Back 30 < ET(jet#1) < 70 GeV PYTHIA Tune A

PTmaxT "Jet#1" Region PTmaxT > 2.0 GeV/c (not included)

Data - Theory: Associated Particle Density dN/dη η η ηdφ φ φ φ

• 2
• 1

1 2 30 60 90 120 150 180 210 240 270 300 330 360

∆φ ∆φ ∆φ ∆φ (degrees)

Data - Theory

CDF Preliminary

data uncorrected theory + CDFSIM

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

Back-to-Back 30 < ET(jet#1) < 70 GeV HERWIG

PTmaxT "Jet#1" Region PTmaxT > 2.0 GeV/c (not included)

For PTmaxT > 2.0 GeV both PYTHIA and HERWIG produce slightly too much “associated” PTsum in the direction of PTmaxT! But HERWIG (without multiple parton interactions) produces too few particles in the direction opposite of PTmaxT! PTmaxT > 2 GeV/c

SLIDE 49

MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 49

Jet Topologies Jet Topologies

∆φ ∆φ ∆φ ∆φ Jet#1 Region PTmaxT Direction Jet#2 Region

Shows the ∆φ

∆φ ∆φ ∆φ dependence of the “associated” charged particle density, dNchg/dη η η ηdφ φ φ φ, pT > 0.5 GeV/c, |η η η η| < 1, PTmaxT > 2.0 GeV/c (not including PTmaxT) relative to PTmaxT (rotated to 180o) and the charged particle density, dNchg/dη η η ηdφ φ φ φ, pT > 0.5 GeV/c, |η η η η| < 1, relative to jet#1 (rotated to 270o) for “back-to-back events” with 30 < ET(jet#1) < 70 GeV.

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

2 6 10 14 18 22 26 30 34 38 42 46 50 54 58 62 66 70 74 78 82 86 90 94 98 102 106 110 114 118 122 126 130 134 138 142 146 150 154 158 162 166 170 174 178 182 186 190 194 198 202 206 210 214 218 222 226 230 234 238 242 246 250 254 258 262 266 270 274 278 282 286 290 294 298 302 306 310 314 318 322 326 330 334 338 342 346 350 354 358

CDF Preliminary

data uncorrected

30 < ET(jet#1) < 70 GeV Back-to-Back

Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) "Transverse" Region "Transverse" Region Jet#1 Associated Density PTmaxT > 2 GeV/c (not included) PTmaxT

Polar Plot

0.5 1.0 1.5 2.0

Jet #3 Jet #3

Jet #1 Jet #1 Jet #2 Jet #2

QCD Three Jet Topology QCD Four Jet Topology

SLIDE 50

MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 50

Jet Topologies Jet Topologies

∆φ ∆φ ∆φ ∆φ Jet#1 Region PTmaxT Direction Jet#2 Region

Shows the ∆φ

∆φ ∆φ ∆φ dependence of the “associated” charged particle density, dNchg/dη η η ηdφ φ φ φ, pT > 0.5 GeV/c, |η η η η| < 1, PTmaxT > 2.0 GeV/c (not including PTmaxT) relative to PTmaxT (rotated to 180o) and the charged particle density, dNchg/dη η η ηdφ φ φ φ, pT > 0.5 GeV/c, |η η η η| < 1, relative to jet#1 (rotated to 270o) for “back-to-back events” with 30 < ET(jet#1) < 70 GeV.

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

2 6 10 14 18 22 26 30 34 38 42 46 50 54 58 62 66 70 74 78 82 86 90 94 98 102 106 110 114 118 122 126 130 134 138 142 146 150 154 158 162 166 170 174 178 182 186 190 194 198 202 206 210 214 218 222 226 230 234 238 242 246 250 254 258 262 266 270 274 278 282 286 290 294 298 302 306 310 314 318 322 326 330 334 338 342 346 350 354 358

CDF Preliminary

data uncorrected

30 < ET(jet#1) < 70 GeV Back-to-Back

Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) "Transverse" Region "Transverse" Region Jet#1 Associated Density PTmaxT > 2 GeV/c (not included) PTmaxT

Polar Plot

0.5 1.0 1.5 2.0

Jet #3 Jet #3

Jet #1 Jet #1 Jet #2 Jet #2

Jet #4 Jet #4

QCD Three Jet Topology QCD Four Jet Topology

SLIDE 51

MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 51

Jet Multiplicity Jet Multiplicity

Shows the data on the number of jets (JetClu, R = 0.7, |η η η η| < 2, ET(jet) > 3 GeV) for “back-to-back” events with 30 < ET(jet#1) < 70 GeV and PTmaxT > 2.0 GeV/c.

Jet #1 Direction ∆φ ∆φ ∆φ ∆φ

“Toward”

“TransMIN” “TransMAX”

PTmaxT Jet #2 Direction

“Away”

Max pT in the “transverse” region!

Jet Multiplicity

0% 10% 20% 30% 40% 50%

1 2 3 4 5 6 7 8 9 10 Number of Jets Percent of Events

Data

CDF Run 2 Pre-Preliminary

data uncorrected theory + CDFSIM

Back-to-Back 30 < ET(jet#1) < 70 GeV PTmaxT > 2.0 GeV/c

Data have about equal amounts

• f 3 and 4 jet topologies!

SLIDE 52

MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 52

Jet Multiplicity Jet Multiplicity

Shows the data on the number of jets (JetClu, R = 0.7, |η η η η| < 2, ET(jet) > 3 GeV) for “back-to-back” events with 30 < ET(jet#1) < 70 GeV and PTmaxT > 2.0 GeV/c.

Jet #1 Direction ∆φ ∆φ ∆φ ∆φ

“Toward”

“TransMIN” “TransMAX”

PTmaxT Jet #2 Direction

“Away”

Max pT in the “transverse” region!

Compares the (uncorrected) data with PYTHIA Tune A after CDFSIM.

Jet Multiplicity

0% 10% 20% 30% 40% 50%

1 2 3 4 5 6 7 8 9 10 Number of Jets Percent of Events

Data

CDF Run 2 Pre-Preliminary

data uncorrected theory + CDFSIM

Back-to-Back 30 < ET(jet#1) < 70 GeV PTmaxT > 2.0 GeV/c

Jet Multiplicity

0% 10% 20% 30% 40% 50%

1 2 3 4 5 6 7 8 9 10 Number of Jets Percent of Events

Data PY Tune A

CDF Run 2 Pre-Preliminary

data uncorrected theory + CDFSIM

Back-to-Back 30 < ET(jet#1) < 70 GeV PTmaxT > 2.0 GeV/c

Data have about equal amounts

• f 3 and 4 jet topologies!

SLIDE 53

MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 53

Jet Multiplicity Jet Multiplicity

Shows the data on the number of jets (JetClu, R = 0.7, |η η η η| < 2, ET(jet) > 3 GeV) for “back-to-back” events with 30 < ET(jet#1) < 70 GeV and PTmaxT > 2.0 GeV/c.

Jet #1 Direction ∆φ ∆φ ∆φ ∆φ

“Toward”

“TransMIN” “TransMAX”

PTmaxT Jet #2 Direction

“Away”

Max pT in the “transverse” region!

Compares the (uncorrected) data with PYTHIA Tune A after CDFSIM.

Jet Multiplicity

0% 10% 20% 30% 40% 50%

1 2 3 4 5 6 7 8 9 10 Number of Jets Percent of Events

Data

CDF Run 2 Pre-Preliminary

data uncorrected theory + CDFSIM

Back-to-Back 30 < ET(jet#1) < 70 GeV PTmaxT > 2.0 GeV/c

Jet Multiplicity

0% 10% 20% 30% 40% 50%

1 2 3 4 5 6 7 8 9 10 Number of Jets Percent of Events

Data PY Tune A

CDF Run 2 Pre-Preliminary

data uncorrected theory + CDFSIM

Back-to-Back 30 < ET(jet#1) < 70 GeV PTmaxT > 2.0 GeV/c

Jet Multiplicity

0% 10% 20% 30% 40% 50%

1 2 3 4 5 6 7 8 9 10 Number of Jets Percent of Events

Data HERWIG

CDF Run 2 Pre-Preliminary

data uncorrected theory + CDFSIM

Back-to-Back 30 < ET(jet#1) < 70 GeV PTmaxT > 2.0 GeV/c

Compares the (uncorrected) data with HERWIG (no MPI) after CDFSIM.

Data have about equal amounts

• f 3 and 4 jet topologies!

HERWIG (without multiple parton interactions) does not have equal amounts of 3 and 4 jet topologies!

SLIDE 54

MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 54

Tuned JIMMY versus Tuned JIMMY versus PYTHIA Tune A PYTHIA Tune A

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

0.1 1.0 10.0 100.0 30 60 90 120 150 180 210 240 270 300 330 360

∆φ ∆φ ∆φ ∆φ (degrees)

Charged PTsum Density (GeV/c) PYA TOT JM TOT JM 2-to-2 JM ISR JM MPI Jet#1

RDF Preliminary

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

PT(jet#1) > 30 GeV/c

"Transverse" Region

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

0.1 1.0 10.0 100.0 30 60 90 120 150 180 210 240 270 300 330 360

∆φ ∆φ ∆φ ∆φ (degrees)

Charged PTsum Density (GeV/c)

Leading Jet PY Tune A

30 < ET(jet#1) < 70 GeV

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

CDF Preliminary

data uncorrected theory + CDFSIM

Jet#1 "Transverse" Region

(left) Shows the Run 2 data on the ∆φ

∆φ ∆φ ∆φ dependence of the charged scalar PTsum density (|η η η η|<1, pT>0.5 GeV/c) relative to the leading jet for 30 < ET(jet#1) < 70 GeV/c compared with PYTHIA Tune A (after CDFSIM).

(right) Shows the generator level predictions of PYTHIA Tune A and a tuned version of JIMMY

(PTmin=1.8 GeV/c) for the ∆φ ∆φ ∆φ ∆φ dependence of the charged scalar PTsum density (|η η η η|<1, pT>0.5 GeV/c) relative to the leading jet for PT(jet#1) > 30 GeV/c. The tuned JIMMY and PYTHIA Tune A agree in the “transverse” region.

(right) For JIMMY the contributions from the multiple parton interactions (MPI), initial-state

radiation (ISR), and the 2-to-2 hard scattering plus finial-state radiation (2-to-2+FSR) are shown.

JIMMY tuned to agree with PYTHIA Tune A!

Jon Butterworth Jeff Forshaw Mike Seymour

SLIDE 55

MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 55

The New Forefront The New Forefront

The forefront of science is moving from the US to CERN (Geneva, Switzerland).

• The LHC is designed to collide protons with protons at

a center-of-mass energy of 14 TeV (seven times greater energy than Fermilab)!

Proton Proton

13 TeV

SLIDE 56

MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 56

Min Min-

• Bias

Bias “ “Associated Associated” ” Charged Particle Density Charged Particle Density

Shows the “associated” charged particle density in the “transverse” region as a function of PTmax for charged particles (pT > 0.5 GeV/c, |η η η η| < 1, not including PTmax) for “min-bias” events at 0.2 TeV, 1.96 TeV and 14 TeV predicted by PYTHIA Tune DW at the particle level (i.e. generator level).

PTmax Direction ∆φ ∆φ ∆φ ∆φ

“Toward”

“Transverse” “Transverse”

“Away”

PTmax Direction ∆φ ∆φ ∆φ ∆φ

“Toward”

“Transverse” “Transverse”

“Away”

RHIC Tevatron 0.2 TeV → 1.96 TeV (UE increase ~2.7 times)

"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|<1.0, PT>0.5 GeV/c)

RDF Preliminary

py Tune DW generator level

Min-Bias

14 TeV 1.96 TeV 0.2 TeV PTmax Direction ∆φ ∆φ ∆φ ∆φ

“Toward”

“Transverse” “Transverse”

“Away”

LHC 1.96 TeV → 14 TeV (UE increase ~1.9 times)

~2.7 ~1.9

SLIDE 57

MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 57

1 1st

st Workshop on Energy Scaling

Workshop on Energy Scaling in Hadron in Hadron-

• Hadron Collisions

Hadron Collisions

“On the Boarder” restaurant, Aurora, IL April 27, 2009 Peter Skands! Renee Fatemi gave a talk on the “underlying event at STAR!

SLIDE 58

MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 58

The The “ “Underlying Event Underlying Event” ” at STAR at STAR

At STAR they have measured the “underlying event at W = 200 GeV (|η

η η η| < 1, pT > 0.2 GeV) and compared their uncorrected data with PYTHIA Tune A + STAR-SIM.

SLIDE 59

MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 59

The The “ “Underlying Event Underlying Event” ” at STAR at STAR

At STAR they have measured the “underlying event at W = 200 GeV (|η

η η η| < 1, pT > 0.2 GeV) and compared their uncorrected data with PYTHIA Tune A + STAR-SIM.

SLIDE 60

MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 60

Min Min-

• Bias

Bias “ “Associated Associated” ” Charged Particle Density Charged Particle Density

Shows the “associated” charged particle density in the “transverse” region as a function of PTmax for charged particles (pT > 0.5 GeV/c, |η η η η| < 1, not including PTmax) for “min-bias” events at 0.2 TeV, 0.9 TeV, 1.96 TeV, 7 TeV, 10 TeV, 14 TeV predicted by PYTHIA Tune DW at the particle level (i.e. generator level).

PTmax Direction ∆φ ∆φ ∆φ ∆φ

“Toward”

“Transverse” “Transverse”

“Away”

PTmax Direction ∆φ ∆φ ∆φ ∆φ

“Toward”

“Transverse” “Transverse”

“Away”

RHIC Tevatron 0.2 TeV → 1.96 TeV (UE increase ~2.7 times)

PTmax Direction ∆φ ∆φ ∆φ ∆φ

“Toward”

“Transverse” “Transverse”

“Away”

LHC 1.96 TeV → 14 TeV (UE increase ~1.9 times)

Linear scale!

"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|<1.0, PT>0.5 GeV/c)

RDF Preliminary

py Tune DW generator level

Min-Bias

14 TeV 1.96 TeV 0.2 TeV 7 TeV 0.9 TeV 10 TeV

"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

Center-of-Mass Energy (TeV)

"Transverse" Charged Density

RDF Preliminary

py Tune DW generator level

Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) PTmax = 5.25 GeV/c

RHIC Tevatron 900 GeV LHC7 LHC14 LHC10

SLIDE 61

MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 61

Min Min-

• Bias

Bias “ “Associated Associated” ” Charged Particle Density Charged Particle Density

Shows the “associated” charged particle density in the “transverse” region as a function of PTmax for charged particles (pT > 0.5 GeV/c, |η η η η| < 1, not including PTmax) for “min-bias” events at 0.2 TeV, 0.9 TeV, 1.96 TeV, 7 TeV, 10 TeV, 14 TeV predicted by PYTHIA Tune DW at the particle level (i.e. generator level).

Log scale!

"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|<1.0, PT>0.5 GeV/c)

RDF Preliminary

py Tune DW generator level

Min-Bias

14 TeV 1.96 TeV 0.2 TeV 7 TeV 0.9 TeV 10 TeV

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

0.0 0.4 0.8 1.2 0.1 1.0 10.0 100.0

Center-of-Mass Energy (TeV)

"Transverse" Charged Density

RDF Preliminary

py Tune DW generator level

Charged Particles (|η η η η|<1.0, PT>0.5 GeV/c) PTmax = 5.25 GeV/c

RHIC Tevatron 900 GeV LHC7 LHC14 LHC10

PTmax Direction ∆φ ∆φ ∆φ ∆φ

“Toward”

“Transverse” “Transverse”

“Away”

PTmax Direction ∆φ ∆φ ∆φ ∆φ

“Toward”

“Transverse” “Transverse”

“Away”

LHC7 LHC14 7 TeV → 14 TeV (UE increase ~20%) Linear on a log plot!

SLIDE 62

MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 62

UE&MB@CMS UE&MB@CMS

Measure Min-Bias and the “Underlying Event” at CMS

The plan involves two phases. Phase 1 would be to measure min-bias and the “underlying event” as soon as possible (when the luminosity is low), perhaps during

• commissioning. We would then tune the QCD Monte-Carlo models

for all the other CMS analyses. Phase 1 would be a service to the rest of the collaboration. As the measurements become more reliable we would re-tune the QCD Monte-Carlo models if necessary and begin Phase 2. Phase 2 is “physics” and would include comparing the min-bias and “underlying event” measurements at the LHC with the measurements we have done (and are doing now) at CDF and then writing a physics publication.

Initial Group Members

Rick Field (Florida) Darin Acosta (Florida) Paolo Bartalini (Florida) Albert De Roeck (CERN) Livio Fano' (INFN/Perugia at CERN) Filippo Ambroglini (INFN/Perugia at CERN) Khristian Kotov (UF Student, Acosta)

UE&MB@CMS UE&MB@CMS

Perugia, Italy, March 2006 University of Perugia Florida-Perugia-CERN PTDR Volume 2 Section 3.3.2

SLIDE 63

MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 63

UE&MB@CMS UE&MB@CMS

Measure Min-Bias and the “Underlying Event” at CMS

The plan involves two phases. Phase 1 would be to measure min-bias and the “underlying event” as soon as possible (when the luminosity is low), perhaps during

• commissioning. We would then tune the QCD Monte-Carlo models

for all the other CMS analyses. Phase 1 would be a service to the rest of the collaboration. As the measurements become more reliable we would re-tune the QCD Monte-Carlo models if necessary and begin Phase 2. Phase 2 is “physics” and would include comparing the min-bias and “underlying event” measurements at the LHC with the measurements we have done (and are doing now) at CDF and then writing a physics publication.

Initial Group Members

Rick Field (Florida) Darin Acosta (Florida) Paolo Bartalini (Florida) Albert De Roeck (CERN) Livio Fano' (INFN/Perugia at CERN) Filippo Ambroglini (INFN/Perugia at CERN) Khristian Kotov (UF Student, Acosta)

UE&MB@CMS UE&MB@CMS

Perugia, Italy, March 2006 University of Perugia Florida-Perugia-CERN PTDR Volume 2 Section 3.3.2

SLIDE 64

MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 64

UE&MB@CMS UE&MB@CMS

Measure Min-Bias and the “Underlying Event” at CMS

The plan involves two phases. Phase 1 would be to measure min-bias and the “underlying event” as soon as possible (when the luminosity is low), perhaps during

• commissioning. We would then tune the QCD Monte-Carlo models

for all the other CMS analyses. Phase 1 would be a service to the rest of the collaboration. As the measurements become more reliable we would re-tune the QCD Monte-Carlo models if necessary and begin Phase 2. Phase 2 is “physics” and would include comparing the min-bias and “underlying event” measurements at the LHC with the measurements we have done (and are doing now) at CDF and then writing a physics publication.

Initial Group Members

Rick Field (Florida) Darin Acosta (Florida) Paolo Bartalini (Florida) Albert De Roeck (CERN) Livio Fano' (INFN/Perugia at CERN) Filippo Ambroglini (INFN/Perugia at CERN) Khristian Kotov (UF Student, Acosta)

UE&MB@CMS UE&MB@CMS

Perugia, Italy, March 2006 University of Perugia Florida-Perugia-CERN PTDR Volume 2 Section 3.3.2

SLIDE 65

MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 65

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)

Outgoing Parton Outgoing Parton Underlying Event Underlying Event Initial-State Radiation Final-State Radiation

SLIDE 66

MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 66

“ “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

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

PT(chgjet#1) Direction ∆φ ∆φ ∆φ ∆φ

“Toward”

“Transverse” “Transverse”

“Away”

PTmax Direction ∆φ ∆φ ∆φ ∆φ

“Toward”

“Transverse” “Transverse”

“Away”

SLIDE 67

MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 67

“ “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)

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MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 68

“ “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).

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PYTHIA Tune DW PYTHIA Tune DW

"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

• n 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

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MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 70

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

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“ “Transverse Transverse” ” Charge Density Charge Density

PTmax Direction ∆φ ∆φ ∆φ ∆φ

“Toward”

“Transverse” “Transverse”

“Away”

PTmax Direction ∆φ ∆φ ∆φ ∆φ

“Toward”

“Transverse” “Transverse”

“Away”

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

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PYTHIA Tune DW PYTHIA Tune DW

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. 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

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PYTHIA Tune Z1 PYTHIA Tune Z1

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 uncorrected and compared with PYTHIA Tune Z1 after detector simulation (SIM). 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 uncorrected and compared with PYTHIA Tune DW and D6T after detector simulation (SIM).

"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 Theory + SIM

7 TeV

DW D6T

"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 pyZ1 + SIM

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

7 TeV

Tune Z1 (CTEQ5L) PARP(82) = 1.932 PARP(90) = 0.275 PARP(77) = 1.016 PARP(78) = 0.538 Tune Z1 is a PYTHIA 6.4 using pT-ordered parton showers and the new MPI model! Color reconnection suppression. Color reconnection strength.

CMS CMS

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MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 74

PYTHIA Tune Z1 PYTHIA Tune Z1

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 uncorrected and compared with PYTHIA Tune Z1 after detector simulation (SIM). 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 uncorrected and compared with PYTHIA Tune DW and D6T after detector simulation (SIM).

"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 Theory + SIM

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

900 GeV 7 TeV

DW D6T

"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 pyZ1 + SIM

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

900 GeV 7 TeV

Tune Z1 (CTEQ5L) PARP(82) = 1.932 PARP(90) = 0.275 PARP(77) = 1.016 PARP(78) = 0.538 Tune Z1 is a PYTHIA 6.4 using pT-ordered parton showers and the new MPI model! Color reconnection suppression. Color reconnection strength.

CMS CMS

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MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 75

PYTHIA Tune Z1 PYTHIA Tune Z1

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 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| < 2.5. The data are corrected and compared with PYTHIA Tune Z1 at the generator level.

Tune Z1 (CTEQ5L) PARP(82) = 1.932 PARP(90) = 0.275 PARP(77) = 1.016 PARP(78) = 0.538 Tune Z1 is a PYTHIA 6.4 using pT-ordered parton showers and the new MPI model!

"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 Z1 generator level

900 GeV 7 TeV

Charged Particles (|η η η η|<2.5, 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 4 6 8 10 12 14 16 18 20

PTmax (GeV/c)

PTsum Density (GeV/c)

RDF Preliminary

ATLAS corrected data Tune Z1 generator level

900 GeV 7 TeV

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

Color reconnection suppression. Color reconnection strength.

ATLAS ATLAS

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MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 76

PYTHIA Tune Z1 PYTHIA Tune Z1

Ratio of CMS preliminary data at 900 GeV and 7 TeV (7 TeV divided by 900 GeV) on the “transverse” charged particle density 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 uncorrected and compared with PYTHIA Tune DW, D6T, CW, and P0 after detector simulation (SIM).

"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

P0

CMS Preliminary

data uncorrected theory + SIM

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

D6T CW DW

Ratio of CMS preliminary data at 900 GeV and 7 TeV (7 TeV divided by 900 GeV) on the “transverse” charged particle density 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 uncorrected and compared with PYTHIA Tune Z1 after detector simulation (SIM).

"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 pyZ1 + SIM

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

CMS CMS

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MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 77

PYTHIA Tune Z1 PYTHIA Tune Z1

Ratio of CMS preliminary data at 900 GeV and 7 TeV (7 TeV divided by 900 GeV) on the “transverse” charged PTsum density 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 uncorrected and compared with PYTHIA Tune DW, D6T, CW, and P0 after detector simulation (SIM). Ratio of CMS preliminary data at 900 GeV and 7 TeV (7 TeV divided by 900 GeV) on the “transverse” charged PTsum density 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 uncorrected and compared with PYTHIA Tune Z1 after detector simulation (SIM).

"Transverse" Charged PTsum Density: dPT/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

P0

CMS Preliminary

data uncorrected theory + SIM

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

D6T CW DW

"Transverse" Charged PTsum Density: dPT/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 pyZ1 + SIM

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

CMS CMS

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MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 78

PYTHIA Tune Z1 PYTHIA Tune Z1

Ratio of the ATLAS preliminary data on the charged PTsum density in the “transverse” region for charged particles (pT > 0.5 GeV/c, |η η η η| < 2.5) at 900 GeV and 7 TeV as defined by PTmax compared with PYTHIA Tune Z1 at the generator level. Ratio of the ATLAS preliminary data on the charged particle density in the “transverse” region for charged particles (pT > 0.5 GeV/c, |η η η η| < 2.5) at 900 GeV and 7 TeV as defined by PTmax compared with PYTHIA Tune Z1 at the generator level.

"Transverse" Charged Particle Density: dN/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) 7 TeV / 900 GeV

RDF Preliminary

ATLAS corrected data Tune Z1 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) 7 TeV / 900 GeV

RDF Preliminary

ATLAS corrected data Tune Z1 generator level

ATLAS ATLAS

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MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 79

CMS Common Plots CMS Common Plots

Done FSQ-12-020 Done FSQ-12-020 UE1: Transverse Nchg & PTsum as defined by the leading charged particle, PTmax |η η η η| < 0.8 pT > 0.5 GeV/c & 1.0 GeV/c Stalled Stalled Stalled Done QCD-10-024 7 TeV Stalled MB4: <pT> versus Nchg |η η η η| < 0.8 pT > 0.5 GeV/c & 1.0 GeV/c Stalled MB3: Multiplicity Distribution |η η η η| < 0.8 pT > 0.5 GeV/c & 1.0 GeV/c Stalled MB2: dNchg/dpT Nchg ≥ 1 |η η η η| < 0.8 Done QCD-10-024 MB1: dNchg/dη η η η Nchg ≥ 1 |η η η η| < 0.8 pT > 0.5 Gev/c & 1.0 GeV/c 900 GeV Observable

Direct charged particles (including leptons) corrected to the particle level with no corrections for SD or DD.

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MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 80

CMS Common Plots CMS Common Plots

Done FSQ-12-020 Done FSQ-12-020 UE1: Transverse Nchg & PTsum as defined by the leading charged particle, PTmax |η η η η| < 0.8 pT > 0.5 GeV/c & 1.0 GeV/c Stalled Stalled Stalled Done QCD-10-024 7 TeV Stalled MB4: <pT> versus Nchg |η η η η| < 0.8 pT > 0.5 GeV/c & 1.0 GeV/c Stalled MB3: Multiplicity Distribution |η η η η| < 0.8 pT > 0.5 GeV/c & 1.0 GeV/c Stalled MB2: dNchg/dpT Nchg ≥ 1 |η η η η| < 0.8 Done QCD-10-024 MB1: dNchg/dη η η η Nchg ≥ 1 |η η η η| < 0.8 pT > 0.5 Gev/c & 1.0 GeV/c 900 GeV Observable

Direct charged particles (including leptons) corrected to the particle level with no corrections for SD or DD.

Note that all the “common plots” require at least one charged particle with pT > 0.5 GeV/c and |η η η η| < 0.8! This was done so that the plots are less sensitive to SD and DD.

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MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 81

CDF Common Plots CDF Common Plots

pT > 0.5 GeV/c Done Stalled Stalled Stalled Done 900 GeV pT > 0.5 GeV/c Done pT > 0.5 GeV/c Done UE1: Transverse Nchg & PTsum as defined by the leading charged particle, PTmax |η η η η| < 0.8 pT > 0.5 GeV/c & 1.0 GeV/c Stalled Stalled Stalled Done 1.96 TeV Stalled MB4: <pT> versus Nchg |η η η η| < 0.8 pT > 0.5 GeV/c & 1.0 GeV/c Stalled MB3: Multiplicity Distribution |η η η η| < 0.8 pT > 0.5 GeV/c & 1.0 GeV/c Stalled MB2: dNchg/dpT Nchg ≥ 1 |η η η η| < 0.8 Done MB1: dNchg/dη η η η Nchg ≥ 1 |η η η η| < 0.8 pT > 0.5 Gev/c & 1.0 GeV/c 300 GeV Observable

Direct charged particles (including leptons) corrected to the particle level with no corrections for SD or DD.

• R. Field, C. Group, and D. Wilson.

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UE Common Plots UE Common Plots

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

0.0 0.5 1.0 1.5 5 10 15 20 25 30

PTmax (GeV/c)

"Transverse" Charged Density

7 TeV

Charged Particles (|η η η η| < 0.8, PT > 0.5 GeV/c) ATLAS (solid blue) ALICE (open black)

RDF Preliminary

corrected data

"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

PTmax (GeV/c)

PTsum Density (GeV/c)

RDF Preliminary

corrected data

7 TeV

Charged Particles (|η η η η| < 0.8, PT > 0.5 GeV/c) ATLAS (solid blue) ALICE (open black)

"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

PTmax (GeV/c)

"Transverse" Charged Density

RDF Preliminary

corrected data

900 GeV

Charged Particles (|η η η η| < 0.8, PT > 0.5 GeV/c) ATLAS (solid blue) ALICE (open black)

"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

PTmax (GeV/c)

PTsum Density (GeV/c)

900 GeV

Charged Particles (|η η η η| < 0.8, PT > 0.5 GeV/c) ATLAS (solid blue) ALICE (open black)

RDF Preliminary

corrected data

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MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 83

UE Common Plots UE Common Plots

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

0.0 0.5 1.0 1.5 5 10 15 20 25 30

PTmax (GeV/c)

"Transverse" Charged Density

7 TeV

Charged Particles (|η η η η| < 0.8, PT > 0.5 GeV/c) ATLAS (solid blue) ALICE (open black)

RDF Preliminary

corrected data

"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

PTmax (GeV/c)

PTsum Density (GeV/c)

RDF Preliminary

corrected data

7 TeV

Charged Particles (|η η η η| < 0.8, PT > 0.5 GeV/c) ATLAS (solid blue) ALICE (open black)

"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

PTmax (GeV/c)

"Transverse" Charged Density

RDF Preliminary

corrected data

900 GeV

Charged Particles (|η η η η| < 0.8, PT > 0.5 GeV/c) ATLAS (solid blue) ALICE (open black)

"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

PTmax (GeV/c)

PTsum Density (GeV/c)

900 GeV

Charged Particles (|η η η η| < 0.8, PT > 0.5 GeV/c) ATLAS (solid blue) ALICE (open black)

RDF Preliminary

corrected data

"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

PTmax (GeV/c)

PTsum Density (GeV/c)

900 GeV

Charged Particles (|η η η η| < 0.8, PT > 0.5 GeV/c) CMS (solid red) ATLAS (solid blue) ALICE (open black)

RDF Preliminary

corrected data

"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

PTmax (GeV/c)

"Transverse" Charged Density

RDF Preliminary

corrected data

900 GeV

Charged Particles (|η η η η| < 0.8, PT > 0.5 GeV/c) CMS (solid red) ATLAS (solid blue) ALICE (open black)

"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

PTmax (GeV/c)

PTsum Density (GeV/c)

RDF Preliminary

corrected data

7 TeV

Charged Particles (|η η η η| < 0.8, PT > 0.5 GeV/c) CMS (solid red) ATLAS (solid blue) ALICE (open black)

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

0.0 0.5 1.0 1.5 5 10 15 20 25 30

PTmax (GeV/c)

"Transverse" Charged Density

7 TeV

Charged Particles (|η η η η| < 0.8, PT > 0.5 GeV/c) CMS (solid red) ATLAS (solid blue) ALICE (open black)

RDF Preliminary

corrected data

SLIDE 84

MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 84

UE Common Plots UE Common Plots

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

0.0 0.5 1.0 1.5 5 10 15 20 25 30

PTmax (GeV/c)

"Transverse" Charged Density

7 TeV

Charged Particles (|η η η η| < 0.8, PT > 0.5 GeV/c) ATLAS (solid blue) ALICE (open black)

RDF Preliminary

corrected data

"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

PTmax (GeV/c)

PTsum Density (GeV/c)

RDF Preliminary

corrected data

7 TeV

Charged Particles (|η η η η| < 0.8, PT > 0.5 GeV/c) ATLAS (solid blue) ALICE (open black)

"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

PTmax (GeV/c)

"Transverse" Charged Density

RDF Preliminary

corrected data

900 GeV

Charged Particles (|η η η η| < 0.8, PT > 0.5 GeV/c) ATLAS (solid blue) ALICE (open black)

"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

PTmax (GeV/c)

PTsum Density (GeV/c)

900 GeV

Charged Particles (|η η η η| < 0.8, PT > 0.5 GeV/c) ATLAS (solid blue) ALICE (open black)

RDF Preliminary

corrected data

"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

PTmax (GeV/c)

PTsum Density (GeV/c)

900 GeV

Charged Particles (|η η η η| < 0.8, PT > 0.5 GeV/c) CMS (solid red) ATLAS (solid blue) ALICE (open black)

RDF Preliminary

corrected data

"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

PTmax (GeV/c)

"Transverse" Charged Density

RDF Preliminary

corrected data

900 GeV

Charged Particles (|η η η η| < 0.8, PT > 0.5 GeV/c) CMS (solid red) ATLAS (solid blue) ALICE (open black)

"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

PTmax (GeV/c)

PTsum Density (GeV/c)

RDF Preliminary

corrected data

7 TeV

Charged Particles (|η η η η| < 0.8, PT > 0.5 GeV/c) CMS (solid red) ATLAS (solid blue) ALICE (open black)

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

0.0 0.5 1.0 1.5 5 10 15 20 25 30

PTmax (GeV/c)

"Transverse" Charged Density

7 TeV

Charged Particles (|η η η η| < 0.8, PT > 0.5 GeV/c) CMS (solid red) ATLAS (solid blue) ALICE (open black)

RDF Preliminary

corrected data

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

0.0 0.5 1.0 1.5 5 10 15 20 25 30

PTmax (GeV/c)

"Transverse" Charged Density

7 TeV

Charged Particles (|η η η η| < 0.8, PT > 0.5 GeV/c) CMS (solid red) ATLAS (solid blue) ALICE (open black)

RDF Preliminary

corrected data Tune Z1 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

PTmax (GeV/c)

PTsum Density (GeV/c)

RDF Preliminary

corrected data Tune Z1 generator level

7 TeV

Charged Particles (|η η η η| < 0.8, PT > 0.5 GeV/c) CMS (solid red) ATLAS (solid blue) ALICE (open black)

"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

PTmax (GeV/c)

"Transverse" Charged Density

RDF Preliminary

corrected data Tune Z1 generator level

900 GeV

Charged Particles (|η η η η| < 0.8, PT > 0.5 GeV/c) CMS (solid red) ATLAS (solid blue) ALICE (open black)

"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

PTmax (GeV/c)

PTsum Density (GeV/c)

900 GeV

Charged Particles (|η η η η| < 0.8, PT > 0.5 GeV/c) CMS (solid red) ATLAS (solid blue) ALICE (open black)

RDF Preliminary

corrected data Tune Z1 generator level

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MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 85

CDF versus CMS CDF versus CMS

CDF and CMS data at 900 GeV/c on the charged particle density in the “transverse” region 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 to the particle level with errors that include both the statistical error and the systematic uncertainty.

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

0.00 0.25 0.50 0.75 4 8 12 16 20

PTmax (GeV/c)

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

900 GeV RDF Preliminary

corrected data

CMS CDF

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

0.00 0.26 0.52 0.78 4 8 12 16 20

PTmax (GeV/c)

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

900 GeV RDF Preliminary

corrected data

CMS CDF

CDF and CMS data at 900 GeV/c on the charged PTsum density in the “transverse” region 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 to the particle level with errors that include both the statistical error and the systematic uncertainty.

CDF versus LHC CDF versus LHC

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MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 86

CDF versus CMS CDF versus CMS

CDF and CMS data at 900 GeV/c on the charged particle density in the “transverse” region 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 to the particle level with errors that include both the statistical error and the systematic uncertainty.

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

0.00 0.25 0.50 0.75 4 8 12 16 20

PTmax (GeV/c)

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

900 GeV RDF Preliminary

corrected data

CMS CDF

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

0.00 0.26 0.52 0.78 4 8 12 16 20

PTmax (GeV/c)

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

900 GeV RDF Preliminary

corrected data

CMS CDF

CDF and CMS data at 900 GeV/c on the charged PTsum density in the “transverse” region 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 to the particle level with errors that include both the statistical error and the systematic uncertainty.

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

0.00 0.25 0.50 0.75 4 8 12 16 20

PTmax (GeV/c)

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

900 GeV RDF Preliminary

corrected data

CMS CDF ATLAS ALICE

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

0.00 0.26 0.52 0.78 4 8 12 16 20

PTmax (GeV/c)

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

900 GeV RDF Preliminary

corrected data

CMS CDF ATLAS ALICE

CDF versus LHC CDF versus LHC

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MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 87

Proton AntiProton

PT(hard)

Outgoing Parton Outgoing Parton Underlying Event Underlying Event Initial-State Radiation Final-State Radiation

Physics Comparisons & Generstor Tunes

CMS Tuning Publication CMS Tuning Publication

Hannes Jung, Paolo Gunnellini, Rick Field

CMS at the LHC 900 GeV, 2.96 TeV, 7 TeV, 8 TeV, 13 TeV To appear soon!

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MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 88

CMS UE Tunes CMS UE Tunes

PTmax Direction ∆φ ∆φ ∆φ ∆φ

“Toward”

“TransMAX” “TransMIN”

“Away”

PYTHIA 6.4 Tune CUETP6S1-CTEQ6L: Start with Tune Z2*-lep and tune to the CDF PTmax “transMAX” and “transMIN” UE data at 300 GeV, 900 GeV, and 1.96 TeV and the CMS PTmax “transMAX” and “transMIN” UE data at 7 TeV. PYTHIA 8 Tune CUETP8S1-CTEQ6L: Start with Corke & Sjöstrand Tune 4C and tune to the CDF PTmax “transMAX” and “transMIN” UE data at 900 GeV, and 1.96 TeV and the CMS PTmax “transMAX” and “transMIN” UE data at 7 TeV. Exclude 300 GeV data. PYTHIA 8 Tune CUETP8S1-HERAPDF1.5LO: Start with Corke & Sjöstrand Tune 4C and tune to the CDF PTmax “transMAX” and “transMIN” UE data at 900 GeV, and 1.96 TeV and the CMS PTmax “transMAX” and “transMIN” UE data at 7 TeV. Exclude 300 GeV data. PYTHIA 8 Tune CUETP8M1-NNPDF2.3LO: Start with the Skands Monash-NNPDF2.3LO tune and tune to the CDF PTmax “transMAX” and “transMIN” UE data at 900 GeV, and 1.96 TeV and the CMS PTmax “transMAX” and “transMIN” UE data at 7 TeV. Exclude 300 GeV data. HERWIG++ Tune CUETHS1-CTEQ6L: Start with the Seymour & Siódmok UE-EE-5C tune and tune to the CDF PTmax “transMAX” and “transMIN” UE data at 900 GeV, and 1.96 TeV and the CMS PTmax “transMAX” and “transMIN” UE data at 7 TeV. PYTHIA 6.4 Tune CUETP6S1-HERAPDF1.5LO: Start with Tune Z2*-lep and tune to the CDF PTmax “transMAX” and “transMIN” UE data at 300 GeV, 900 GeV, and 1.96 TeV and the CMS PTmax “transMAX” and “transMIN” UE data at 7 TeV.

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MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 89

CUETP8S1 CUETP8S1-

• CTEQ6L

CTEQ6L

CMS data at 7 TeV and CDF data at 1.96 TeV, 900 GeV, and 300 GeV on the charged particle density in the “transAVE” region 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 compared with PYTHIA 8 Tune CUETP8S1-CTEQ6L (excludes 300 GeV in fit).

"TransAVE" Charged Particle Density

0.0 0.4 0.8 1.2 5 10 15 20 25 30

PTmax (GeV/c)

Charged Particle Density

CMS Tune CUETP8S1-CTEQ6L

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

300 GeV 900 GeV 1.96 TeV 7 TeV

CMS data at 7 TeV and CDF data at 1.96 TeV, 900 GeV, and 300 GeV on the charged particle density in the “transAVE” region 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 compared with PYTHIA 6.4 Tune Z2*.

"TransAVE" Charged Particle Density

0.0 0.4 0.8 1.2 5 10 15 20 25 30

PTmax (GeV/c)

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

300 GeV 900 GeV 1.96 TeV 7 TeV

Tune Z2*-CTEQ6L

Exclude 300 GeV data!

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MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 90

CUETP8M1 CUETP8M1-

• NNPDF2.3LO

NNPDF2.3LO

CMS data at 7 TeV and CDF data at 1.96 TeV, 900 GeV, and 300 GeV on the charged particle density in the “transAVE” region 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 compared with the PYTHIA 8 Tune Monash-NNPDF2.3LO. CMS data at 7 TeV and CDF data at 1.96 TeV, 900 GeV, and 300 GeV on the charged particle density in the “transAVE” region 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 compared with the PYTHIA 8 Tune CUETP8M1-NNPDF2.3LO (excludes 300 GeV in fit).

"TransAVE" Charged Particle Density

0.0 0.4 0.8 1.2 5 10 15 20 25 30

PTmax (GeV/c)

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

300 GeV 900 GeV 1.96 TeV 7 TeV

CUETP8M1-NNPDF2.3LO "TransAVE" Charged Particle Density

0.0 0.4 0.8 1.2 5 10 15 20 25 30

PTmax (GeV/c)

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

300 GeV 900 GeV 1.96 TeV 7 TeV Monash-NNPDF2.3LO

Exclude 300 GeV data!

SLIDE 91

MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 91

UE@CMS 13 UE@CMS 13 TeV TeV

ChgJet#1 Direction ∆φ ∆φ ∆φ ∆φ

“Toward”

“TransMAX” “TransMIN”

“Away”

Measure the “Underlying Event” at 13 TeV at CMS UE@13TeV

Livio Fano' (University of Perugia) Diego Ciangottini (University of Perugia) Rick Field (University of Florida) Doug Rank (University of Florida) Sunil Bansal (Panjab University Chandigarh) Wei Yang Wang (National University of Singapore)

UE&MB@CMS UE&MB@CMS

University of Perugia

PTmax Direction ∆φ ∆φ ∆φ ∆φ

“Toward”

“TransMAX” “TransMIN”

“Away”

Measure the UE observables 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. Measure the UE observables as defined by the leading charged particle, PTmax, for charged particles with pT > 0.5 GeV/c and |η η η η| < 2.0 and |η η η η| < 0.8.

Proton Proton

PT(hard)

Outgoing Parton Outgoing Parton Underlying Event Underlying Event Initial-State Radiation Final-State Radiation

Livio & Rick were part of the CMS Run 1 UE&MB team!

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MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 92

ChgJet#1 ChgJet#1 vs vs PTmax PTmax

Corrected data (Bayesian unfolding) on the “transAVE” charged particle density with pT > 0.5 GeV/c and |η η η η| < 2.0 as defined by the leading charged particle, PTmax, and as defined by the leading charged particle jet, chgjet#1. The data are compared with PYTHIA 8 tune CUETP8S1-CTEQ6L at the generator level..

"transAVE" Charged Particle Density

0.0 0.7 1.4 2.1 5 10 15 20 25 30 35 40 45 50

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

Average Density

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

13 TeV CMS Run 2 Preliminary

Corrected Data (Bayesian Unfolding) Generator Level Theory

CMS Tune CUETP8S1-CTEQ6L PTmax chgjet#1

"transAVE" Charged PTsum Density

0.0 0.8 1.6 2.4 5 10 15 20 25 30 35 40 45 50 55

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

Average Density (GeV/c)

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

13 TeV CMS Run 2 Preliminary

Corrected Data (Bayesian Unfolding) Generator Level Theory

CMS Tune CUETP8S1-CTEQ6L PTmax chgjet#1

Corrected data (Bayesian unfolding) on the “transAVE” charged PTsum density with pT > 0.5 GeV/c and |η η η η| < 2.0 as defined by the leading charged particle, PTmax, and as defined by the leading charged particle jet, chgjet#1. The data are compared with PYTHIA 8 tune CUETP8S1-CTEQ6L at the generator level..

SLIDE 93

MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 93

ChgJet#1 ChgJet#1 vs vs PTmax PTmax

Corrected data (Bayesian unfolding) on the “transMAX” charged particle density with pT > 0.5 GeV/c and |η η η η| < 2.0 as defined by the leading charged particle, PTmax, and as defined by the leading charged particle jet, chgjet#1. The data are compared with PYTHIA 8 tune CUETP8S1-CTEQ6L at the generator level.. Corrected data (Bayesian unfolding) on the “transMAX” charged PTsum density with pT > 0.5 GeV/c and |η η η η| < 2.0 as defined by the leading charged particle, PTmax, and as defined by the leading charged particle jet, chgjet#1. The data are compared with PYTHIA 8 tune CUETP8S1-CTEQ6L at the generator level..

"transMAX" Charged PTsum Density

0.0 1.0 2.0 3.0 5 10 15 20 25 30 35 40 45 50

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

Average Density (GeV/c)

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

13 TeV CMS Run 2 Preliminary

Corrected Data (Bayesian Unfolding) Generator Level Theory

CMS Tune CUETP8S1-CTEQ6L PTmax chgjet#1

"transMAX" Charged Particle Density

0.0 0.8 1.6 2.4 5 10 15 20 25 30 35 40 45 50

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

Average Density

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

CMS Run 2 Preliminary

Corrected Data (Bayesian Unfolding) Generator Level Theory

13 TeV

CMS Tune CUETP8S1-CTEQ6L PTmax chgjet#1

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MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 94

ChgJet#1 ChgJet#1 vs vs PTmax PTmax

Corrected data (Bayesian unfolding) on the “transMIN” charged particle density with pT > 0.5 GeV/c and |η η η η| < 2.0 as defined by the leading charged particle, PTmax, and as defined by the leading charged particle jet, chgjet#1. The data are compared with PYTHIA 8 tune CUETP8S1-CTEQ6L at the generator level.. Corrected data (Bayesian unfolding) on the “transMIN” charged PTsum density with pT > 0.5 GeV/c and |η η η η| < 2.0 as defined by the leading charged particle, PTmax, and as defined by the leading charged particle jet, chgjet#1. The data are compared with PYTHIA 8 tune CUETP8S1-CTEQ6L at the generator level..

"transMIN" Charged Particle Density

0.0 0.5 1.0 1.5 5 10 15 20 25 30 35 40 45 50

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

Average Density

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

13 TeV CMS Run 2 Preliminary

Corrected Data (Bayesian Unfolding) Generator Level Theory

CMS Tune CUETP8S1-CTEQ6L PTmax chgjet#1

"transMIN" Charged PTsum Density

0.0 0.6 1.2 1.8 5 10 15 20 25 30 35 40 45 50

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

Average Density (GeV/c)

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

13 TeV CMS Run 2 Preliminary

Corrected Data (Bayesian Unfolding) Generator Level Theory

CMS Tune CUETP8S1-CTEQ6L PTmax chgjet#1

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MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 95

ChgJet#1 ChgJet#1 vs vs PTmax PTmax

Corrected data (Bayesian unfolding) on the “transDIF” charged particle density with pT > 0.5 GeV/c and |η η η η| < 2.0 as defined by the leading charged particle, PTmax, and as defined by the leading charged particle jet, chgjet#1. The data are compared with PYTHIA 8 tune CUETP8S1-CTEQ6L at the generator level.. Corrected data (Bayesian unfolding) on the “transDIF” charged PTsum density with pT > 0.5 GeV/c and |η η η η| < 2.0 as defined by the leading charged particle, PTmax, and as defined by the leading charged particle jet, chgjet#1. The data are compared with PYTHIA 8 tune CUETP8S1-CTEQ6L at the generator level..

"transDIF" Charged PTsum Density

0.0 0.6 1.2 1.8 5 10 15 20 25 30 35 40 45 50

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

Average Density (GeV/c)

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

13 TeV CMS Run 2 Preliminary

Corrected Data (Bayesian Unfolding) Generator Level Theory

CMS Tune CUETP8S1-CTEQ6L PTmax chgjet#1

"transDIF" Charged Particle Density

0.0 0.4 0.8 1.2 5 10 15 20 25 30 35 40 45 50 55

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

Average Density

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

13 TeV CMS Run 2 Preliminary

Corrected Data (Bayesian Unfolding) Generator Level Theory

CMS Tune CUETP8S1-CTEQ6L PTmax chgjet#1

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MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 96

UE Publications UE Publications

Publications on the “underlying event” (2000-2015).

"Underlying Event" Publications

10 20 30

2 2 1 2 2 2 3 2 4 2 5 2 6 2 7 2 8 2 9 2 1 2 1 1 2 1 2 2 1 3 2 1 4 2 1 5

Year Number

Other CDF

The Underlying Event in Large Transverse Momentum Charged Jet and Z−boson Production at CDF, R. Field, published in the proceedings of DPF 2000. Charged Jet Evolution and the Underlying Event in Proton-Antiproton Collisions at 1.8 TeV, CDF Collaboration, Phys. Rev. D65 (2002) 092002.

Many LHC UE Studies

SLIDE 97

MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 97

UE Publications UE Publications

Publications on the “underlying event” (2000-2015).

"Underlying Event" Publications

10 20 30

2 2 1 2 2 2 3 2 4 2 5 2 6 2 7 2 8 2 9 2 1 2 1 1 2 1 2 2 1 3 2 1 4 2 1 5

Year Number

Other CDF

The Underlying Event in Large Transverse Momentum Charged Jet and Z−boson Production at CDF, R. Field, published in the proceedings of DPF 2000. Charged Jet Evolution and the Underlying Event in Proton-Antiproton Collisions at 1.8 TeV, CDF Collaboration, Phys. Rev. D65 (2002) 092002. Gavin Salam! Perugia Tunes,

Peter Skands! Many LHC UE Studies HERWIG++ UE Tune, M. Seymour and A. Siódmok!

Monash Tune,

Peter Skands!

A Study of the Energy Dependence of the Underlying Event in Proton-Antiproton Collisions, CDF Collaboration, submitted to Phys. Rev. D. (August 24, 2015)!

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MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 98

Proton AntiProton

PT(hard)

Outgoing Parton Outgoing Parton Underlying Event Underlying Event Initial-State Radiation Final-State Radiation

Sorry to be so slow!!

Latest CDF UE Publication Latest CDF UE Publication

CDF Run 2 Tevatron Energy Scan 300 GeV, 900 GeV, 1.96 TeV

The goal is to produce data (corrected to the particle level) that can be used by the theorists to tune and improve the QCD Monte-Carlo models that are used to simulate hadron-hadron collisions.

Submitted to PRD

http://arxiv.org/abs/1508.05340

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MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 99

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

0.0 0.5 1.0 1.5 5 10 15 20 25 30

PTmax (GeV/c)

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

1.96 TeV 300 GeV 900 GeV 7 TeV 13 TeV RDF Preliminary

Corrected Data

“ “Tevatron Tevatron” ” to the LHC to the LHC

CDF CDF CDF

Mapping out the Energy Dependence of the UE (300 GeV, 900 GeV, 1.96 TeV, 7 TeV, 13 TeV) My dream!

CMS

SLIDE 100

MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 100

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

0.0 0.5 1.0 1.5 5 10 15 20 25 30

PTmax (GeV/c)

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

1.96 TeV 300 GeV 900 GeV 7 TeV 13 TeV RDF Preliminary

Corrected Data

“ “Tevatron Tevatron” ” to the LHC to the LHC

CDF CDF CDF

Mapping out the Energy Dependence of the UE (300 GeV, 900 GeV, 1.96 TeV, 7 TeV, 13 TeV) My dream!

CMS

Fake data generated by Rick using the Monash tune with the statistics we currently have at CMS!

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MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 101

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

0.0 0.5 1.0 1.5 5 10 15 20 25 30

PTmax (GeV/c)

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

1.96 TeV 300 GeV 900 GeV 7 TeV 13 TeV RDF Preliminary

Corrected Data

“ “Tevatron Tevatron” ” to the LHC to the LHC

CDF CDF CDF

Mapping out the Energy Dependence of the UE (300 GeV, 900 GeV, 1.96 TeV, 7 TeV, 13 TeV) My dream!

CMS

13 TeV UE data coming soon from both ATLAS and CMS!

Coming soon!

SLIDE 102

MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 102

Rick Rick’ ’s UE Graduate Students s UE Graduate Students

Richard Haas (CDF Ph.D. 2001): The Underlying Event in Hard Scattering Collisions of Proton and Antiproton at 1.8 TeV.

Alberto Cruz (CDF Ph.D. 2005): Using MAX/MIN Transverse Regions to Study the Underlying Event in Run 2 at the Tevatron. Craig Group (CDF Ph.D. 2006): The Inclusive Jet Cross Section in Run 2 at CDF. Deepak Kar (CDF Ph.D. 2008): Studying the Underlying Event in Drell-Yan and High Transverse Momentum Jet Production at the Tevatron. Mohammed Zakaria (CMS Ph.D. 2013): Measurement of the Underlying Event Activity in Proton-Proton Collisions at the LHC using Leading Tracks at 7 TeV and Comparison with 0.9 TeV. Doug Rank (CMS Ph.D. Expected 2016): The Underlying Evant via Leading Track and Track Jet at 13 TeV.

Proton Proton

PT(hard)

Outgoing Parton Outgoing Parton Underlying Event Underlying Event Initial-State Radiation Final-State Radiation

SLIDE 103

MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 103

7 7 GeV GeV π π π π π π π π0

0’

’s s → → 1 1 TeV TeV Jets Jets

7 GeV/c π π π π0’s!

FF1 CMS

SLIDE 104

MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 104

7 7 GeV GeV π π π π π π π π0

0’

’s s → → 1 1 TeV TeV Jets Jets

7 GeV/c π π π π0’s!

FF1 CMS

Rick & Jimmie CALTECH 1973 Rick & Jimmie ISMD - Chicago 2013

SLIDE 105

MPI@LHC ICTP Trieste, November 23, 2015 Rick Field – Florida/CDF/CMS Page 105

7 7 GeV GeV π π π π π π π π0

0’

’s s → → 1 1 TeV TeV Jets Jets

7 GeV/c π π π π0’s!

FF1 CMS

Rick & Jimmie CALTECH 1973 Rick & Jimmie ISMD - Chicago 2013

Happy Anniversary 49 Years!

Jimmie and Rick Married November 24, 1966