QGP-like effects in Small Systems with LHC Run3+ Naghmeh Mohammadi - - PowerPoint PPT Presentation

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QGP-like effects in Small Systems with LHC Run3+ Naghmeh Mohammadi - - PowerPoint PPT Presentation

Feb 08, 2024 972 likes •1.29k views

QGP-like effects in Small Systems with LHC Run3+ Naghmeh Mohammadi arxiv:1812.06772 (HL-LHC WG5 yellow report) 1 01.03.2019 COST Workshop on Interplay of hard and soft QCD probes for collectivity in HIC, Lund, Sweden Emergence of Hot and

slide-1
SLIDE 1

QGP-like effects in Small Systems with LHC Run3+

Naghmeh Mohammadi

COST Workshop on Interplay of hard and soft QCD probes for collectivity in HIC, Lund, Sweden 01.03.2019

  • 1

arxiv:1812.06772 (HL-LHC WG5 yellow report)

slide-2
SLIDE 2

Emergence of Hot and Dense QCD in Small Systems

JHEP09(2010)091

  • Phys. Lett. B 765 (2017) 193

01.03.2019 Naghmeh Mohammadi @ COST workshop-Lund university

  • 2

pp pp

❖ Initially a reference for the effects observed in Pb-Pb collisions ❖ Observations in high multiplicity pp collisions: ❖ Azimuthal correlations of final state hadrons

slide-3
SLIDE 3

Emergence of Hot and Dense QCD in Small Systems

JHEP09(2010)091 Nature Physics 13, 535–539 (2017)

  • Phys. Lett. B 765 (2017) 193

01.03.2019 Naghmeh Mohammadi @ COST workshop-Lund university

  • 3

Ω/π Ξ/π Λ/π Κ0s/π

pp pPb PbPb

pp pp

❖ Initially a reference for the effects observed in Pb-Pb collisions ❖ Observations in high multiplicity pp collisions: ❖ Azimuthal correlations of final state hadrons ❖ Enhanced production of multi-strange hadrons

slide-4
SLIDE 4

Emergence of Hot and Dense QCD in Small Systems

JHEP09(2010)091 Nature Physics 13, 535–539 (2017)

  • Phys. Lett. B 765 (2017) 193

01.03.2019 Naghmeh Mohammadi @ COST workshop-Lund university

  • 4

Ω/π Ξ/π Λ/π Κ0s/π

pp pPb PbPb

pp pp

❖ Initially a reference for the effects observed in Pb-Pb collisions ❖ Observations in high multiplicity pp collisions: ❖ Azimuthal correlations of final state hadrons ➡ Is the physical origin of collectivity the same in small and large systems? ❖ Enhanced production of multi-strange hadrons ➡ Is there a smooth transition from pp to PbPb collisions?

slide-5
SLIDE 5

Emergence of Hot and Dense QCD in Small Systems

JHEP09(2010)091 Nature Physics 13, 535–539 (2017)

  • Phys. Lett. B 765 (2017) 193

01.03.2019 Naghmeh Mohammadi @ COST workshop-Lund university

  • 5

Ω/π Ξ/π Λ/π Κ0s/π

pp pPb PbPb

pp pp

❖ Initially a reference for the effects observed in Pb-Pb collisions ❖ Observations in high multiplicity pp collisions: ❖ Azimuthal correlations of final state hadrons ➡ Is the physical origin of collectivity the same in small and large systems? ❖ Enhanced production of multi-strange hadrons ➡ Is there a smooth transition from pp to PbPb collisions?

❖ Is there a unified theory to describe small and large systems simultaneously?

❖ To tackle these questions: Higher luminosity LHC for more detailed studies

slide-6
SLIDE 6

Proton-proton multiplicity distribution

❖ Multiplicity distribution extrapolation based on the current ALICE and ATLAS data ❖ Extrapolated to 200 pb-1 14 TeV high multiplicity pp collisions

01.03.2019 Naghmeh Mohammadi @ COST workshop-Lund university

  • 6

Run 3+4

slide-7
SLIDE 7

❖ Multiplicity distribution extrapolation based on the current ALICE and ATLAS data ❖ Extrapolated to 200 pb-1 14 TeV high multiplicity pp collisions ❖ Few particle systems to study the onset of collectivity

Naghmeh Mohammadi @ COST workshop-Lund university 01.03.2019

  • 7

Proton-proton multiplicity distribution

Run 3+4

slide-8
SLIDE 8

❖ Multiplicity distribution extrapolation based on the current ALICE and ATLAS data ❖ Extrapolated to 200 pb-1 14 TeV high multiplicity pp collisions ❖ 730k events in multiplicity range of 65-70% PbPb collisions ❖ Overlap between pp and PbPb allows to compare the two systems

01.03.2019 Naghmeh Mohammadi @ COST workshop-Lund university

  • 8

~65-70% PbPb

Proton-proton multiplicity distribution

Run 3+4

slide-9
SLIDE 9

❖ Multiplicity distribution extrapolation based on the current ALICE and ATLAS data ❖ Extrapolated to 200 pb-1 14 TeV high multiplicity pp collisions ❖ 28k events in multiplicity range of 60-65% PbPb collisions ❖ Overlap between pp and PbPb allows to compare the two systems

Naghmeh Mohammadi @ COST workshop-Lund university 01.03.2019

  • 9

~60-65% PbPb

Proton-proton multiplicity distribution

Run 3+4

slide-10
SLIDE 10

/dy

ch

dN 20 40 60 80 100 )

3

(GeV/fm ε 1 10

2

10 Central Pb-Pb = 0.2 fm/c τ

pp p-Pb Pb-Pb IP Glasma Glauber MC

❖ Energy density: ❖ An estimate for pp, pPb and Pb-Pb collisions based on ❖ IP-Glasma ❖ Glauber MC (for pPb and PbPb) + Bjorken estimate ❖ Dependent on the system at fixed multiplicity ❖ It can reach large values in pp and pPb collisions, of the order of central Pb-Pb collisions ❖ One way of calculating the energy density

Energy density in different collision systems

Same multiplicity does not mean same energy density

Naghmeh Mohammadi @ COST workshop-Lund university 01.03.2019

  • 10
slide-11
SLIDE 11

Global-event properties

❖ Shape of the multiplicity distribution ❖ Mechanisms producing very high multiplicity events not clear ❖ Mean pT increases with multiplicity ❖ Measurements exist only up to dNch/dη ~55 ❖ HL-LHC will provide twice this value ❖ High multiplicity collisions originate from MPI within the same pp collision ❖ Understanding particle production in high energy pp collisions ❖ Number of low momentum transfer parton interactions increases linearly with multiplicity ❖ Possible saturation at large multiplicity

01.03.2019 Naghmeh Mohammadi @ COST workshop-Lund university

  • 11
slide-12
SLIDE 12

Particle correlations: multi-particle cumulants

❖ Particle correlations: ❖ In high multiplicity pp to compare with pPb and PbPb collisions ❖ In low multiplicity regions to investigate the onset of the collective-like effects ❖ Suppresses correlations from jets and dijets ❖ Measured in pp and pPb with Run 1 & 2 using 3 subevent method ❖ c3{4} lacks statistics in pp and mostly consistent with zero ❖ c3{4} negative non zero magnitude in PbPb collisions ❖ Is c3{4} negative in pp collisions?

cn{4} = hhein(φ1+φ2−φ3−φ4)ii 2hhein(φ1−φ2)ii2

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❖ 4 particle cumulants (cn{4})

ch

N 50 100 150 200 250 {4}

3

c 1.5 − 1 − 0.5 − 0.5 1 1.5

6 −

10 ×

prescaled HMT unprescaled HMT

Internal ATLAS =13 TeV s pp <3.0 GeV

T

|<2.5 0.3<p η |

  • 1

Run 2, 0.9 pb

  • 1

Projected, 200 pb

{4}

3

1.5% v {4}

3

2.0% v

01.03.2019 Naghmeh Mohammadi @ COST workshop-Lund university

  • 12

Run 3+4

pp

slide-13
SLIDE 13

Particle correlations: multi-particle cumulants

❖ Particle correlations: ❖ In high multiplicity pp to compare with pPb and PbPb collisions ❖ In low multiplicity regions to investigate the onset of the collective-like effects ❖ Suppresses correlations from jets and dijets ❖ Measured in pp and pPb with Run 1 & 2 using 3 subevent method ❖ c3{4} lacks statistics in pp and mostly consistent with zero ❖ c3{4} negative non zero magnitude in PbPb collisions ❖ Is c3{4} negative in pp collisions?

cn{4} = hhein(φ1+φ2−φ3−φ4)ii 2hhein(φ1−φ2)ii2

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❖ 4 particle cumulants (cn{4})

ch

N 50 100 150 200 250 {4}

3

c 1.5 − 1 − 0.5 − 0.5 1 1.5

6 −

10 ×

prescaled HMT unprescaled HMT

Internal ATLAS =13 TeV s pp <3.0 GeV

T

|<2.5 0.3<p η |

  • 1

Run 2, 0.9 pb

  • 1

Projected, 200 pb

{4}

3

1.5% v {4}

3

2.0% v

01.03.2019 Naghmeh Mohammadi @ COST workshop-Lund university

  • 13

1.5% v3{4} Run 3+4

pp

slide-14
SLIDE 14

❖ Symmetric cumulants: Correlations of different flow harmonics, e.g. ❖ Sensitive to ❖ Initial conditions ❖ Hydrodynamic evolution ❖ In small systems: better description of the initial condition and proton substructure

Particle correlations: symmetric cumulants

〉

ch

N 〈

100 150 200 250 300

SC(2,3)

0.4 − 0.2 − 0.2 0.4 0.6 0.8 1

6 −

10 ×

CMS Internal

= 13 TeV s p+p < 3 GeV/c

T

0.3 < p | < 2.4 η |

  • 1

Run 1+2, 2 pb no-sub

  • 1

Projected, 200 pb no-sub 2-sub 3-sub 4-sub

〉

ch

N 〈

100 150 200 250 300 350 400 450 500

SC(2,3)

1 − 0.8 − 0.6 − 0.4 − 0.2 − 0.2 0.4 0.6

6 −

10 ×

CMS Internal

= 5.02 TeV

NN

s p+Pb < 3 GeV/c

T

0.3 < p | < 2.4 η |

  • 1

Run 1+2, 35 nb no-sub

  • 1

Projected, 1000 nb no-sub 2-sub 3-sub 4-sub

SC(3, 2) = hv2

2v2 3i hv2 2ihv2 3i

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❖ Particle correlations: ❖ In high multiplicity pp to compare with pPb and PbPb collisions ❖ In low multiplicity regions to investigate the onset of the collective-like effects

01.03.2019 Naghmeh Mohammadi @ COST workshop-Lund university

  • 14

Run 3+4

pp pPb

slide-15
SLIDE 15

❖ Symmetric cumulants: Correlations of different flow harmonics, e.g. ❖ Sensitive to ❖ Initial conditions ❖ Hydrodynamic evolution ❖ In small systems: better description of the initial condition and proton substructure

Particle correlations: symmetric cumulants

〉

ch

N 〈

100 150 200 250 300

SC(2,3)

0.4 − 0.2 − 0.2 0.4 0.6 0.8 1

6 −

10 ×

CMS Internal

= 13 TeV s p+p < 3 GeV/c

T

0.3 < p | < 2.4 η |

  • 1

Run 1+2, 2 pb no-sub

  • 1

Projected, 200 pb no-sub 2-sub 3-sub 4-sub

〉

ch

N 〈

100 150 200 250 300 350 400 450 500

SC(2,3)

1 − 0.8 − 0.6 − 0.4 − 0.2 − 0.2 0.4 0.6

6 −

10 ×

CMS Internal

= 5.02 TeV

NN

s p+Pb < 3 GeV/c

T

0.3 < p | < 2.4 η |

  • 1

Run 1+2, 35 nb no-sub

  • 1

Projected, 1000 nb no-sub 2-sub 3-sub 4-sub

❖ Current measurements -> large uncertainties ❖ Projections for SC(3,2) for HL pp and pPb collisions ❖ Projections for no-sub: uncertainties invisible but largely contaminated with non-flow ❖ 2,3 and 4-sub event methods possible: uncertainties of the order of a few 10-7

SC(3, 2) = hv2

2v2 3i hv2 2ihv2 3i

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❖ Particle correlations: ❖ In high multiplicity pp to compare with pPb and PbPb collisions ❖ In low multiplicity regions to investigate the onset of the collective-like effects

01.03.2019 Naghmeh Mohammadi @ COST workshop-Lund university

  • 15

Run 3+4

pp pPb

slide-16
SLIDE 16

) c (GeV/

T

p 1 2 3 4 5 6 7 8

sub 2

v 0.00 0.05 0.10 0.15 0.20 HL-LHC Projection p-Pb

0-20%

  • 1

= 500 nb

int

L ALICE

< 0.04

cms

y in -1.26 <

e → (c,b)

< 3.53

cms

y < -2.96 or 2.03 <

cms

y in -4.46 <

ψ Inclusive J/ < 250

  • ffline

trk

N 185 <

  • 1

= 2 pb

int

L CMS

< 0.54

cms

y in -1.46 <

Prompt D

< 1.94

cms

y < -1.86 or 0.94 <

cms

y in -2.86 <

ψ Prompt J/

Particle correlations: heavy flavors in small systems

❖ v2 for heavy flavor objects feasible in pPb collisions with HL-LHC: ❖ Inclusive J/ψ with ALICE, Prompt J/ψ and D by CMS ❖ Minor uncertainties expected ❖ Heavy flavor hadrons originate from heavy quarks that experienced all stages of the system evolution ❖ heavy flavor flow measurements: ❖ Low pT: test if heavy flavor quarks participate in the collective expansion dynamics ❖ Intermediate pT: sensitive to the heavy-quark hadronization mechanism/recombination

01.03.2019 Naghmeh Mohammadi @ COST workshop-Lund university

  • 16

Run 3+4

pPb

slide-17
SLIDE 17

2

v 0.1 0.2 )

2

v p(

4 −

10

3 −

10

2 −

10

1 −

10 1 10

2

10

ATLAS, JHEP 11 (2013) 183

= 2.76 TeV

NN

s 60-65% Pb-Pb, at

  • 1

= 200 pb

int

= 14 TeV, L s Projection for pp at

HL-LHC Projection pp < 137 η /d

ch

N 98 < d

❖ Probability distribution of event-by-event v2 (p(v2)) in an approximate level: ❖ Sensitive to ❖ Initial conditions and final state dynamics of the medium ❖ Not measured in small systems so far ❖ Expected to have a narrower width and smaller <v2> ❖ Feasible in small systems in HL-LHC ❖ Projections for pp at 14 TeV, Lint = 200 pb-1 : ❖ Based on 60-65% Pb-Pb collisions at 2.76 TeV

Particle correlations: probability distribution of event-by-event vn

01.03.2019 Naghmeh Mohammadi @ COST workshop-Lund university

  • 17

Run 3+4

pp

slide-18
SLIDE 18

Strangeness enhancement

|< 0.5 η |

〉 η /d

ch

N d 〈

10

2

10

3

10

)

  • π

+

+

π / (

+

Ω +

  • Ω
  • 4

10

  • 3

10

= 7 TeV Nat. Phys. 13 (2017) 535 s pp,

  • 1

Projection for 14 TeV pp, 200 pb = 5.02 TeV PLB 728 (2014) 25

NN

s p-Pb, = 5.02 TeV

NN

s Preliminary Pb-Pb,

PYTHIA8 DIPSY EPOS LHC ALICE Upgrade projection Multiplicity slicing with mid-rapidity estimator

ALI−SIMUL−160917

❖ Key observable in run 2 pp physics: ❖ Smooth increase in strange-particle production as a function of system size ❖ pp collisions up to dNch/dη = 17 ❖ Most peripheral PbPb collisions down to dNch/dη = 96 ❖ Projection of the reach with pp collisions in HL-LHC ❖ Strangeness enhancement scaling with the energy density of the system ❖ continuous increase ❖ saturation at PbPb value (thermal limit)

01.03.2019 Naghmeh Mohammadi @ COST workshop-Lund university

  • 18

Run 3+4

slide-19
SLIDE 19

Energy loss: hadron-jet correlations

) c (GeV/

T,jet ch

p

20 40 60 80 100 120 140 160 180

Ratio High EA / Low EA

0.7 0.8 0.9 1 1.1 1.2 1.3 1.4 1.5

= 1.48e+06

trig

N High EA: percentile = 0.001, = 7.39e+08

trig

N Low EA: percentile = 0.500, c 90 percent CL, spectrum shift = -0.175 GeV/ ALICE Upgrade simulation

  • 1

= 14 TeV, 200 pb s pp, c < 20 GeV/

T

p Trigger: 15 < = 0.4 R ,

T

k Jets: charged-only, anti-

) c (GeV/

T,jet ch

p

50 100 150 200

Ratio High EA / Low EA

0.7 0.8 0.9 1 1.1 1.2 1.3 1.4 1.5

= 8.44e+06

trig

N High EA: percentile = 0.050, = 8.44e+07

trig

N Low EA: percentile = 0.500, c 90 percent CL, spectrum shift = -0.069 GeV/ ALICE Upgrade simulation

  • 1

= 5 TeV, 0.5 pb

NN

s Pb, − p c < 20 GeV/

T

p Trigger: 15 < = 0.4 R ,

T

k Jets: charged-only, anti-

❖ Absence of jet quenching in p-Pb collisions in run 1 & 2 ❖ If final state interactions explain observed collective phenomena ❖ energy loss should be measurable OR put stringent limit ❖ Potential to identify small energy loss effects in small systems with jet recoil against other objects ❖ Projections for the modification of jet recoil yields extracted from hadron-jet correlations in run 3 and 4 for pp and pPb collision -> 40-100 times smaller than the spectrum shift in PbPb collisions

01.03.2019 Naghmeh Mohammadi @ COST workshop-Lund university

  • 19

Run 3+4 spectrum shift: 0.175 GeV spectrum shift: 0.069 GeV

pp pPb

PYTHIA

slide-20
SLIDE 20

Energy loss: γ and Z + jet correlations

T γ

/p

T jet

= p

γ j

x

0.5 1 1.5 2

γ j

dx

γ j

dN

γ

N 1

0.2 0.4 0.6 0.8 1 1.2 1.4 1.6

〉

ch

N 〈 < 5 〉

ch

N 〈 5 - 7 〉

ch

N 〈 7 - 10

CMS Projection

> 60 GeV/c

γ T

p < 1.44

γ

η 8 π 7 >

γ j

φ Δ jet R = 0.3

T

anti-k > 30 GeV/c

jet T

p < 1.6

jet

η

  • 1

pp 200 pb

0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2

Z T

/p

jet T

=p

jZ

x

0.5 1 1.5 2 2.5 3 3.5

jZ

/dx

jZ

dN

Z

1/N Simulation Internal ATLAS + jet ll → Z

  • 1

=8.8 TeV, 2 pb

NN

s +Pb, p

Powheg+Pythia8 0-100% centrality >30 GeV

jet T

p >60 GeV,

Z T

p 8 π 7 | > φ Δ | |<2.5

l

η >20 GeV, |

l T

p < -2

CM jet

η

  • 4.5 <

| < 1

CM jet

η | < 4.5

CM jet

η 2 <

❖ Absence of jet quenching in p-Pb collisions in run 1 & 2 ❖ If final state interactions explain observed collective phenomena ❖ energy loss should be measurable OR put stringent limit ❖ Potential to identify small energy loss effects in small systems with jet recoil against other objects ❖ Projections for the correlations between jet, γ and Z in run 3 and 4 for pp and pPb collision ❖ γ and Z unmodified by final state interactions

01.03.2019 Naghmeh Mohammadi @ COST workshop-Lund university

  • 20

Run 3+4

pp pPb

slide-21
SLIDE 21

Thermal radiation

❖ Search for thermal dilepton signal in pp and pPb ❖ QGP thermal radiation detection in pPb ❖ Extract the medium temperature ❖ Measurements in pPb collisions ❖ Statistical uncertainty of 10% on the temperature ❖ If predictions accurate -> Lint = 50 nb-1 sufficient for the measurement ❖ If signal 50% smaller -> 5 times the statistics is needed ❖ Run 3+4 sensitive to down to 25% of the predicted signal by R. Rapp [Acta Phys. Polon. B42 (2011) 2823]

01.03.2019 Naghmeh Mohammadi @ COST workshop-Lund university

  • 21

Detectable signal vs. Lint Run 3+4

pPb

slide-22
SLIDE 22

Oxygen-Oxygen collisions

❖ An opportunity to study ❖ The emergence of collective phenomena ❖ Possible energy loss

Highest multiplicities in pPb in the tail of the distribution Similar multiplicities reached in O-O collisions

❖ Study properties of low multiplicity (peripheral) Pb-Pb collisions ❖ O-O collision multiplicities similar to p-Pb collisions ❖ Collision geometry well defined

01.03.2019 Naghmeh Mohammadi @ COST workshop-Lund university

  • 22

Run 3+4

slide-23
SLIDE 23

Summary and outlook

|< 0.5 η |

〉 η /d

ch

N d 〈

10

2

10

3

10

)

  • π

+

+

π / (

+

Ω +

  • Ω
  • 4

10

  • 3

10

= 7 TeV Nat. Phys. 13 (2017) 535 s pp,

  • 1

Projection for 14 TeV pp, 200 pb = 5.02 TeV PLB 728 (2014) 25

NN

s p-Pb, = 5.02 TeV

NN

s Preliminary Pb-Pb,

PYTHIA8 DIPSY EPOS LHC ALICE Upgrade projection Multiplicity slicing with mid-rapidity estimator

ALI−SIMUL−160917

〉

ch

N 〈

100 150 200 250 300

SC(2,3)

0.4 − 0.2 − 0.2 0.4 0.6 0.8 1

6 −

10 ×

CMS Internal

= 13 TeV s p+p < 3 GeV/c

T

0.3 < p | < 2.4 η |

  • 1

Run 1+2, 2 pb no-sub

  • 1

Projected, 200 pb no-sub 2-sub 3-sub 4-sub

SC(2,3)

0.8 − 0.6 − 0.4 − 0.2 − 0.2 0.4 0.6

T γ

/p

T jet

= p

γ j

x

0.5 1 1.5 2

γ j

dx

γ j

dN

γ

N 1

0.2 0.4 0.6 0.8 1 1.2 1.4 1.6

〉

ch

N 〈 < 5 〉

ch

N 〈 5 - 7 〉

ch

N 〈 7 - 10

CMS Projection

> 60 GeV/c

γ T

p < 1.44

γ

η 8 π 7 >

γ j

φ Δ jet R = 0.3

T

anti-k > 30 GeV/c

jet T

p < 1.6

jet

η

  • 1

pp 200 pb

❖ Discoveries in recent years caused a paradigm shift in modelling: ❖ Heavy ion collisions ❖ Underlying events in pp collisions ❖ Multi-particle correlations present also in small systems ❖ No evidence for other features related to final state interactions, e.g. energy loss ❖ HL-LHC provides the data required for understanding the remaining open question in small systems ❖ Higher order correlations ❖ Strange-particle yields ❖ Thermal radiation ❖ Energy loss signals ❖ … ❖ Universal description of small to large collision systems

01.03.2019 Naghmeh Mohammadi @ COST workshop-Lund university

  • 23
slide-24
SLIDE 24

Back-up

01.03.2019 Naghmeh Mohammadi @ COST workshop-Lund university

  • 24
slide-25
SLIDE 25

Overview of Experimental Results

01.03.2019 Naghmeh Mohammadi @ COST workshop-Lund university

slide-26
SLIDE 26

Proton-proton collisions at extreme multiplicities

❖ Multiplicity distribution extrapolation based on the current ALICE and ATLAS data ❖ Parametrization with single negative binomial distribution for various center of mass energies ❖ Extrapolated to 14 TeV pp collisions at ALICE and ATLAS ❖ Predict no. of events at a given multiplicity using smaller phase space (|η|<1.5) ❖ Extrapolate up to |η|<2.5 using flat η distribution ❖ Use PYTHIA to go to |η|<4.0 for run 4

| < 1.5) η (|

ch

N 20 40 60 80 100 120 140 160 )

ch

P(N

  • 7

10

  • 6

10

  • 5

10

  • 4

10

  • 3

10

  • 2

10

  • 1

10 0.9 TeV 2.76 TeV 7 TeV 8 TeV

ALICE (|η|<1.5)

01.03.2019 Naghmeh Mohammadi @ COST workshop-Lund university

  • 26

Run 3+4

slide-27
SLIDE 27

Proton-proton collisions at extreme multiplicities

| < 1.5) η (|

ch

N 20 40 60 80 100 120 140 160 )

ch

P(N

  • 7

10

  • 6

10

  • 5

10

  • 4

10

  • 3

10

  • 2

10

  • 1

10 0.9 TeV 2.76 TeV 7 TeV 8 TeV

ALICE (|η|<1.5)

❖ Multiplicity distribution extrapolation based on the current ALICE and ATLAS data ❖ Parametrization with single negative binomial distribution for various center of mass energies ❖ Extrapolated to 14 TeV pp collisions at ALICE and ATLAS ❖ Predict no. of events at a given multiplicity using smaller phase space (|η|<1.5) ❖ Extrapolate up to |η|<2.5 using flat η distribution ❖ Use PYTHIA to go to |η|<4.0 for run 4

01.03.2019 Naghmeh Mohammadi @ COST workshop-Lund university

  • 27
slide-28
SLIDE 28

Proton-proton collisions at extreme multiplicities

| < 1.5) η (|

ch

N 20 40 60 80 100 120 140 160 )

ch

P(N

  • 7

10

  • 6

10

  • 5

10

  • 4

10

  • 3

10

  • 2

10

  • 1

10 0.9 TeV 2.76 TeV 7 TeV 8 TeV

ALICE (|η|<1.5)

❖ Multiplicity distribution extrapolation based on the current ALICE and ATLAS data ❖ Parametrization with single negative binomial distribution for various center of mass energies ❖ Extrapolated to 14 TeV pp collisions at ALICE and ATLAS ❖ Predict no. of events at a given multiplicity using smaller phase space (|η|<1.5) ❖ Extrapolate up to |η|<2.5 using flat η distribution ❖ Use PYTHIA to go to |η|<4.0 for run 4 ❖ Number of events with equivalent multiplicity ranges in pPb and Pb-Pb collisions

01.03.2019 Naghmeh Mohammadi @ COST workshop-Lund university

  • 28
slide-29
SLIDE 29

Particle correlations: multi-particle cumulants

❖ Particle correlations: ❖ In high multiplicity pp to compare with pPb and PbPb collisions ❖ In low multiplicity regions to investigate the onset of the collective-like effects ❖ pp: 1.5% v3{4} accessible for Nch> 170 ❖ pPb: 1.5% v3{4} accessible for 100 < Nch < 500 ❖ Larger tracker acceptance in run 4 ATLAS & CMS -> 1% v3{4} accessible

cn{4} = hhein(φ1+φ2−φ3−φ4)ii 2hhein(φ1−φ2)ii2

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❖ 4 particle cumulants (cn{4})

ch

N 100 200 300 400 500 {4}

3

c 0.6 − 0.4 − 0.2 − 0.2 0.4 0.6 0.8 1

6 −

10 ×

Internal ATLAS =5.02 TeV

NN

s p+Pb <3.0 GeV

T

|<2.5 0.3<p η |

  • 1

Run 1 and 2, 28 nb

  • 1

Projected, 1000 nb

{4}

3

1.5% v {4}

3

2.0% v

ch

N 50 100 150 200 250 {4}

3

c 1.5 − 1 − 0.5 − 0.5 1 1.5

6 −

10 ×

prescaled HMT unprescaled HMT

Internal ATLAS =13 TeV s pp <3.0 GeV

T

|<2.5 0.3<p η |

  • 1

Run 2, 0.9 pb

  • 1

Projected, 200 pb

{4}

3

1.5% v {4}

3

2.0% v

|<2.5) η (|

ch

N 50 100 150 200 250 {4}

3

c 0.3 − 0.2 − 0.1 − 0.1 0.2 0.3

6 −

10 ×

prescaled HMT unprescaled HMT

Projected

  • 1

200 pb Internal ATLAS =13 TeV s pp <3.0 GeV

T

0.3<p

|<2.5 η | |<4.0 η |

{4}

3

1.0% v {4}

3

1.5% v {4}

3

2.0% v

01.03.2019 Naghmeh Mohammadi @ COST workshop-Lund university

  • 29

Run 3+4

slide-30
SLIDE 30

Particle correlations: multi-particle cumulants

❖ Particle correlations: ❖ In high multiplicity pp to compare with pPb and PbPb collisions ❖ In low multiplicity regions to investigate the onset of the collective-like effects

cn{4} = hhein(φ1+φ2−φ3−φ4)ii 2hhein(φ1−φ2)ii2

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❖ 4 particle cumulants (cn{4})

c3{4} in pPb collisions

01.03.2019 Naghmeh Mohammadi @ COST workshop-Lund university

  • 30

Run 3+4