mpi@tau 2012

MPI@TAU 2012 Tel Aviv, October 15, 2012

Rick Field – Florida/CDF/CMS

Rick FieldUniversity of Florida

Outline of Talk

Proton AntiProton

PT(hard)

Outgoing Parton

Outgoing Parton

Underlying Event Underlying Event

Initial-State Radiation

Final-State Radiation

CMS at the LHCCDF Run 2

CDF PYTHIA 6.2 Tevatron Tune DW.

CMS PYTHIA 6.4 LHC Tune Z1.

300 GeV, 900 GeV, 1.96 TeV 900 GeV, 7 & 8 TeV

New UE data at 300 GeV, 900 GeV, and 1.96 TeV from the Tevatron Energy-Scan.

New comparisons with PYTHIA 6.4 Tune Z1.

New MB data at 300 GeV, 900 GeV, and 1.96 TeV from the Tevatron Energy-Scan.

Tel Aviv University October 14-18, 2012

LPCC MB&UE working group “common plots”.

MPI@TAU 2012MPI@TAU 2012Energy Dependence of the UE



Traditional ApproachTraditional Approach

Look at charged particle correlations in the azimuthal angle relative to a leading object (i.e. CaloJet#1, ChgJet#1, PTmax, Z-boson). For CDF PTmin = 0.5 GeV/c cut = 1.

Charged Particle Correlations PT > PTmin || < cut

Leading Object Direction

“Toward”

“Transverse” “Transverse”

“Away”

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

Leading Calorimeter Jet or Leading Charged Particle Jet or

Leading Charged Particle orZ-Boson

-cut +cut

2

0

Leading Object

Toward Region

Transverse Region

Transverse Region

Away Region

Away Region

All three regions have the same area in - space, × = 2cut×120o = 2cut×2/3. Construct densities by dividing by the area in - space.

Charged Jet #1Direction


“Toward”

“Away”

“Toward-Side” Jet

“Away-Side” Jet

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

CDF Run 1 Analysis



““Transverse” Charged DensityTransverse” Charged Density PTmax Direction

“Toward”


“Away”

ChgJet#1 Direction

“Toward”


“Away”

Shows the charged particle density in the “transverse” region for charged particles (pT > 0.5 GeV/c, || < 1) at 7 TeV as defined by PTmax, PT(chgjet#1), and PT(muon-pair) from PYTHIA Tune DW at the particle level (i.e. generator level). Charged particle jets are constructed using the Anti-KT algorithm with d = 0.5.

"Transverse" Charged Particle Density: dN/dd

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

RDF Preliminarypy Tune DW generator level

PTmax

ChgJet#1DY(muon-pair)

70 < M(pair) < 110 GeV

Muon-Pair Direction

“Toward”


“Away”



Jet Radius DependenceJet Radius Dependence

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

The UE activity is higherfor large jet radius!


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RDF PreliminarypyZ1 generator level

d = 0.5

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Tune Z1

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



PYTHIA Tune DWPYTHIA Tune DW

PTmax Direction

“Toward”


“Away”


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ATLAS corrected dataTune DW generator level

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ATLAS preliminary data at 900 GeV and 7 TeV on the “transverse” charged particle density, dN/dd, as defined by the leading charged particle (PTmax) for charged particles with pT > 0.5 GeV/c and || < 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 on the “transverse” charged particle density, dN/dd, as defined by the leading charged particle jet (chgjet#1) for charged particles with pT > 0.5 GeV/c and || < 2. The data are uncorrected and compared with PYTHIA Tune DW after detector simulation.


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CMS Preliminarydata uncorrected

pyDW + SIM


7 TeV

CMS ATLAS

PT(chgjet#1) Direction

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Leading Jet

RDF Preliminarydata corrected

pyDW generator level

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



PYTHIA Tune DWPYTHIA Tune DW

Ratio of CMS preliminary data at 900 GeV and 7 TeV on the “transverse” charged particle density, dN/dd, as defined by the leading charged particle jet (chgjet#1) for charged particles with pT > 0.5 GeV/c and || < 2. The data are uncorrected and compared with PYTHIA Tune DW after detector simulation.


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io: 7

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pyDW + SIM

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

CMS


“Toward”


“Away”

CMS preliminary data at 900 GeV and 7 TeV on the “transverse” charged particle density, dN/dd, as defined by the leading charged particle jet (chgjet#1) for charged particles with pT > 0.5 GeV/c and || < 2. The data are uncorrected and compared with PYTHIA Tune DW after detector simulation.


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CMS


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Ratio



PYTHIA Tune Z1PYTHIA Tune Z1

Proton Proton

PT(hard)

Outgoing Parton

Outgoing Parton




I believe that it is time to move to PYTHIA 6.4 (pT-ordered parton showers and new MPI model)!

Tune Z1: I started with the parameters of ATLAS Tune AMBT1, but I changed LO* to CTEQ5L and I varied PARP(82) and PARP(90) to get a very good fit of the CMS UE data at 900 GeV and 7 TeV.

UE&MB@CMSUE&MB@CMS

All my previous tunes (A, DW, DWT, D6, D6T, CW, X1, and X2) were PYTHIA 6.4 tunes using the old Q2-ordered parton showers and the old MPI model (really 6.2 tunes)!

PARP(90)

Color

Connections

PARP(82)

Diffraction

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



PYTHIA Tune Z1PYTHIA Tune Z1Parameter

Tune Z1(R. Field CMS)

Tune AMBT1 (ATLAS)

Parton Distribution Function CTEQ5L LO*

PARP(82) – MPI Cut-off 1.932 2.292

PARP(89) – Reference energy, E0 1800.0 1800.0

PARP(90) – MPI Energy Extrapolation 0.275 0.25

PARP(77) – CR Suppression 1.016 1.016

PARP(78) – CR Strength 0.538 0.538

PARP(80) – Probability colored parton from BBR 0.1 0.1

PARP(83) – Matter fraction in core 0.356 0.356

PARP(84) – Core of matter overlap 0.651 0.651

PARP(62) – ISR Cut-off 1.025 1.025

PARP(93) – primordial kT-max 10.0 10.0

MSTP(81) – MPI, ISR, FSR, BBR model 21 21

MSTP(82) – Double gaussion matter distribution 4 4

MSTP(91) – Gaussian primordial kT 1 1

MSTP(95) – strategy for color reconnection 6 6

Parameters not shown are the PYTHIA 6.4

defaults!



CMS UE DataCMS UE Data

CMS published data at 900 GeV and 7 TeV on the “transverse” charged PTsum density, dPT/dd, as defined by the leading charged particle jet (chgjet#1) for charged particles with pT > 0.5 GeV/c and || < 2.0. The data are corrected and compared with PYTHIA Tune Z1 at the generator level.

CMS published data at 900 GeV and 7 TeV on the “transverse” charged particle density, dN/dd, as defined by the leading charged particle jet (chgjet#1) for charged particles with pT > 0.5 GeV/c and || < 2.0. The data are corrected and compared with PYTHIA Tune Z1 at the generator level.

CMS


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CMS Preliminarydata corrected

Tune Z1 generator level

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"Transverse" Charged PTsum Density: dPT/dd

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/c)


CMS Preliminarydata corrected


900 GeV

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Tune Z1

Very nice agreement!CMS correcteddata!

CMS correcteddata!

CMSTune Z1



ATLAS UE DataATLAS UE Data

ATLAS published data at 900 GeV and 7 TeV on the “transverse” charged PTsum density, dPT/dd, as defined by the leading charged particle (PTmax) for charged particles with pT > 0.5 GeV/c and || < 2.5. The data are corrected and compared with PYTHIA Tune Z1 at the generrator level.

ATLAS published data at 900 GeV and 7 TeV on the “transverse” charged particle density, dN/dd, as defined by the leading charged particle (PTmax) for charged particles with pT > 0.5 GeV/c and || < 2.5. The data are corrected and compared with PYTHIA Tune Z1 at the generator level.

ATLASATLASTune Z1Tune Z1

ATLAS publication – arXiv:1012.0791December 3, 2010


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RDF Preliminary ATLAS corrected dataTune Z1 generator level

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RDF PreliminaryATLAS corrected data


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CDF PublishedCorrected Data

PYTHIA Tune Z1



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






CMS Common PlotsCMS Common PlotsObservable 900 GeV 7 TeV

MB1: dNchg/d Nchg ≥ 1 || < 0.8 pT > 0.5 Gev/c & 1.0 GeV/c

DoneQCD-10-024

DoneQCD-10-024

MB2: dNchg/dpT Nchg ≥ 1 || < 0.8 Stalled Stalled

MB3: Multiplicity Distribution|| < 0.8 pT > 0.5 GeV/c & 1.0 GeV/c Stalled Stalled

MB4: <pT> versus Nchg|| < 0.8 pT > 0.5 GeV/c & 1.0 GeV/c

In progress(Antwerp)

In progress(Antwerp)

UE1: Transverse Nchg & PTsum as defined by the leading charged particle, PTmax || < 0.8 pT > 0.5 GeV/c & 1.0 GeV/c

DoneFSQ-12-020

DoneFSQ-12-020

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

Note that all the “common plots” requireat least one charged particle with

pT > 0.5 GeV/c and || < 0.8!This done so that the plots are

less sensitive to SD and DD.



MB Common Plots 7 TeVMB Common Plots 7 TeV




UE Common PlotsUE Common Plots"Transverse" Charged Particle Density: dN/dd

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

RDF Preliminary corrected data


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corrected data

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ATLAS (solid blue)ALICE (open black)


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New CMS UE DataNew CMS UE Data

CMS preliminary data at 900 GeV and 7 TeV on the “transverse” charged PTsum density, dPT/dd, as defined by the leading charged particle (PTmax) for charged particles with pT > 0.5 GeV/c and || < 0.8. The data are corrected and compared with PYTHIA Tune Z1 at the generator level.

CMS preliminary data at 900 GeV and 7 TeV on the “transverse” charged particle density, dN/dd, as defined by the leading charged particle (PTmax) for charged particles with pT > 0.5 GeV/c and || < 0.8. The data are corrected and compared with PYTHIA Tune Z1 at the generator level.

Very nice agreement!CMS correcteddata!

CMS correcteddata!


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corrected dataTune Z1 generator level


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CMS Preliminary corrected data



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Tune Z1

CMS CMSTune Z1


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Tune Z1

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

7 TeV

8 TeV

Less than 4% change!



UE Common PlotsUE Common Plots"Transverse" Charged Particle Density: dN/dd

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CMS (solid red)ATLAS (solid blue)ALICE (open black)



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corrected dataTune Z1 generator level




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Tevatron Energy ScanTevatron Energy Scan

Just before the shutdown of the Tevatron CDF has collected more than 10M “min-bias” events at several center-of-mass energies!

Proton

AntiProton

1 mile CDF

Proton AntiProton 1.96 TeV300 GeV

300 GeV 12.1M MB Events900 GeV 54.3M MB Events

900 GeV



New CDF UE DataNew CDF UE Data

New Corrected CDF data at 300 GeV, 900 GeV, and 1.96 TeV on the “transverse” charged particle density, dN/dd, as defined by the leading charged particle (PTmax) for charged particles with pT > 0.5 GeV/c and || < 1.0.

PTmax Direction

“Toward”


“Away”


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CDF Preliminary Corrected Data


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Tune Z1 Generator Level


1.96 TeV

300 GeV

900 GeV

PYTHIA Tune Z1

900 GeV37,075,521 Events

300 GeV7,233,840 Events

1.96 TeV25,371,145 Events




New Corrected CDF data at 300 GeV, 900 GeV, and 1.96 TeV on the “transverse” charged PTsum density, dPT/dd, as defined by the leading charged particle (PTmax) for charged particles with pT > 0.5 GeV/c and || < 1.0.

PTmax Direction

“Toward”


“Away”


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PYTHIA Tune Z1






New Corrected CDF data at 300 GeV, 900 GeV, and 1.96 TeV on the “transverse” charged particle average pT, as defined by the leading charged particle (PTmax) for charged particles with pT > 0.5 GeV/c and || < 1.0.

PTmax Direction

“Toward”


“Away”

"Transverse" Charged Particle AvePT

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PYTHIA Tune Z1





Energy DependenceEnergy Dependence"Transverse" Charged Particle Density: dN/dd

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Corrected Data


5.0 < PTmax < 6.0 GeV/c


New Corrected CDF data at 300 GeV, 900 GeV, and 1.96 TeV on the “transverse” charged particle density, dN/dd, as defined by the leading charged particle (PTmax) for charged particles with pT > 0.5 GeV/c and || < 1.0 for 5.0 < PTmax < 6.0 GeV/c.


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PYTHIA Tune Z1


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PYTHIA Tune Z1



Energy DependenceEnergy Dependence

New Corrected CDF data at 300 GeV, 900 GeV, and 1.96 TeV on the “transverse” charged PTsum density, dPT/dd, as defined by the leading charged particle (PTmax) for charged particles with pT > 0.5 GeV/c and || < 1.0.

New Corrected CDF data at 300 GeV, 900 GeV, and 1.96 TeV on the “transverse” charged PTsum density, dPT/dd, as defined by the leading charged particle (PTmax) for charged particles with pT > 0.5 GeV/c and || < 1.0 for 5.0 < PTmax < 6.0 GeV/c.


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Tune Z1

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Tune Z1



Energy DependenceEnergy Dependence

New Corrected CDF data at 300 GeV, 900 GeV, and 1.96 TeV on the “transverse” charged particle average pT as defined by the leading charged particle (PTmax) for charged particles with pT > 0.5 GeV/c and || < 1.0.

New Corrected CDF data at 300 GeV, 900 GeV, and 1.96 TeV on the “transverse” charged particle average pT as defined by the leading charged particle (PTmax) for charged particles with pT > 0.5 GeV/c and || < 1.0 for 5.0 < PTmax < 6.0 GeV/c.


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PYTHIA Tune Z1





Energy Ratio: 1960/300Energy Ratio: 1960/300


Ratio of the CDF data at 300 GeV and 1.96 TeV on the “transverse” charged particle density, dN/dd, as defined by the leading charged particle (PTmax) for charged particles with pT > 0.5 GeV/c and || < 1.0. Shows 1.96 TeV divided by 300 GeV.


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CDF Preliminary Corrected Data Ratio


1.96 TeV divided by 300 GeV


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PYTHIA Tune Z1


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Tune Z1





Ratio of the CDF data at 300 GeV and 900 GeV on the “transverse” charged particle density, dN/dd, as defined by the leading charged particle (PTmax) for charged particles with pT > 0.5 GeV/c and || < 1.0. Shows 900 GeV divided by 300 GeV.


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900 GeV divided by 300 GeV


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PYTHIA Tune Z1


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Tune Z1 Generator LevelTune Z1





Ratio of the CDF data at 900 GeV and 1.96 TeV on the “transverse” charged particle density, dN/dd, as defined by the leading charged particle (PTmax) for charged particles with pT > 0.5 GeV/c and || < 1.0. Shows 1.96 TeV divided by 900 GeV.


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PYTHIA Tune Z1


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PYTHIA 6.4 Tune Z1PYTHIA 6.4 Tune Z1"Transverse" Charged Particle Density: dN/dd

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Corrected DataTune Z1 Generator Level


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PYTHIA Tune Z1


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PYTHIA Tune Z1


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Tune Z1


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RDF Preliminary Corrected Data

Charged Particles (PT>0.5 GeV/c)

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PYTHIA Tune Z1

7 TeV

CDF

CDFCDF

ALICE

ATLAS CMS



PYTHIA 6.4 Tune Z1PYTHIA 6.4 Tune Z1"Transverse" Charged PTsum Density: dPT/dd

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PYTHIA Tune Z1




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Tune Z1 Generator Level 7 TeV

CDF

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PYTHIA 6.4 Tune Z1PYTHIA 6.4 Tune Z1"Transverse" Charged Particle AvePT

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New CDF MB DataNew CDF MB DataPseudo-Rapidity Distribution: dN/d

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At least 1 charged particle

New Corrected CDF data at 300 GeV, 900 GeV, and 1.96 TeV on on pseudo-rapidity distribution of charged particles, dN/d, with pT > 0.5 GeV/c. Events are required to have at least one charged particle with || < 0.8 and pT > 0.5 GeV/c. The data are corrected to the particle level with errors that include both the statistical error and the systematic uncertainty.

Pseudo-Rapidity Distribution: dN/d

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New CDF MB DataNew CDF MB Data

New Corrected CDF data at 300 GeV, 900 GeV, and 1.96 TeV on on pseudo-rapidity distribution of charged particles, dN/d, with pT > 1.0 GeV/c. Events are required to have at least one charged particle with || < 0.8 and pT > 1.0 GeV/c. The data are corrected to the particle level with errors that include both the statistical error and the systematic uncertainty.


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Energy Dependence dN/dEnergy Dependence dN/d

CMS data at 7 TeV and 900 GeV and CDF data at 1.96 TeV, 900 GeV, and 300 GeV on dN/d at = 0 with pT > 0.5 GeV/c as a function of the center-of-mass energy. Events are required to have at least one charged particle with || < 0.8 and pT > 0.5 GeV/c. The data are corrected to the particle level with errors that include both the statistical error and the systematic uncertainty.

Pseudo-Rapidity Distribution: dN/d(=0)

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Energy Dependence dN/dEnergy Dependence dN/d

CMS data at 7 TeV and 900 GeV and CDF data at 1.96 TeV, 900 GeV, and 300 GeV on dN/d at = 0 with pT > 1.0 GeV/c as a function of the center-of-mass energy. Events are required to have at least one charged particle with || < 0.8 and pT > 1.0 GeV/c. The data are corrected to the particle level with errors that include both the statistical error and the systematic uncertainty.


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MB Common Plots 900 GeVMB Common Plots 900 GeV



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PTmax versus Leading JetPTmax versus Leading Jet"Transverse" Charged Particle Density: dN/dd

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Published CDF Run 2 data at 1.96 TeV on the “transverse” charged particle density, dN/dd, as defined by the leading calorimeter jet (jet#1) for charged particles with pT > 0.5 GeV/c and || < 1.0 compared with PYTHIA Tune Z1.


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CDF PreliminaryCorrected Data


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PYTHIA Tune Z1

New CDF data 1.96 TeV on the “transverse” charged particle density, dN/dd, as defined by the leading charged particle (PTmax) for charged particles with pT > 0.5 GeV/c and || < 1.0 compared with PYTHIA Tune Z1.

Yikes!???


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OkayNo inconsistency

But need to understand!



More Coming Soon!More Coming Soon!CDF - Many More UE Observables: Nchg density, PTsum

density, average pT, “toward”, “away”, “transverse”, “transMAX”, “transMIN”, distributions, etc..

CDF - Two Ranges: Must do (pT > 0.5 GeV/c, || < 0.8) as well as (pT > 0.5 GeV, || < 1).

CDF - Min-Bias: Many MB observables: Multiplicity, dN/d, pT distribution, <pT> versus Nchg, etc.

Soon we will have MB & UE data at300 GeV, 900 GeV, 1.96 TeV, 7 TeV, and 8 TeV!

We can study the energy dependence more precisely than ever before!

What we are learning shouldallow for a deeper understanding of MPI

which will result in more precisepredictions at the future LHC energy of 13 TeV!

mpi@tau 2012

Documents

charged particle density

charged particles

leading charged particle

particle level

particle correlations

particle jets

pythia tune z1

tevatron tune