rick field university of florida

LPCC MB&UE Meeting CERN June 17, 2011

Rick Field – Florida/CDF/CMS

Rick FieldUniversity of Florida

Proton Proton

PT(hard)

Outgoing Parton

Outgoing Parton

Underlying Event Underlying Event

Initial-State Radiation

Final-State Radiation

UE&MB@CMSUE&MB@CMS

MB&UE Working Group Meeting

CMS

ATLAS

Common Plots & UE Comparisons

Outline of Talk

June 17, 2011

CMS-ATLAS-ALICE (corrected) UE data at (900 GeV and 7 TeV) and comparisons with some of the LHC tunes. Update on the UE common plots and new results since the last meeting.

CMS-ATLAS-ALICE MB Common Plots: Update on the “min-bias” common plots. New results since the last meeting.



MB Common Plots 900 GeVMB Common Plots 900 GeV

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

Last UE&MB Meeting



MB Common Plots 7 TeVMB Common Plots 7 TeV


Last UE&MB Meeting



New ALICE Common PlotsNew ALICE Common Plots



MB Common Plots 7 TeVMB Common Plots 7 TeV


Thanks to Regina for the plots!Thanks to ATLAS for the data!



Other ComparisonsOther Comparisons

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

Thanks to Regina for the plot!



ALICE Common PlotsALICE Common Plots



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

Done

QCD-10-024

Done

QCD-10-024

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

MB3: Multiplicity Distribution

|| < 0.8 pT > 0.5 GeV/c & 1.0 GeV/cStalled 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

In progress

(M. Zakaria)

In progress

(M. Zakaria)




PYTHIA 6.4.25PYTHIA 6.4.25 --------------------------------------------------------------------- 4th generation: tunes incorporating 7-TeV data --------------------------------------------------------------------- 340 AMBT1 : 1st ATLAS tune incl 7 TeV, w. LO* PDFs (2010) 341 Z1 : Retune of AMBT1 by Field w CTEQ5L PDFs (2010) 342 Z1-LEP : Retune of Z1 by Skands w CTEQ5L PDFs (2010) 343 Z2 : Retune of Z1 by Field w CTEQ6L1 PDFs (2010) 344 Z2-LEP : Retune of Z1 by Skands w CTEQ6L1 PDFs (2010) 350 Perugia 2011 : Retune of Perugia 2010 incl 7-TeV data (Mar 2011) 351 P2011 radHi : Variation with alphaS(pT/2) 352 P2011 radLo : Variation with alphaS(2pT) 353 P2011 mpiHi : Variation with more semi-hard MPI 354 P2011 noCR : Variation without color reconnections 355 P2011 LO** : Perugia 2011 using MSTW LO** PDFs (Mar 2011) 356 P2011 C6 : Perugia 2011 using CTEQ6L1 PDFs (Mar 2011) 357 P2011 T16 : Variation with PARP(90)=0.16 away from 7 TeV 358 P2011 T32 : Variation with PARP(90)=0.32 awat from 7 TeV 359 P2011 TeV : Perugia 2011 optimized for Tevatron (Mar 2011) 360 S Global : Schulz-Skands Global fit (Mar 2011) 361 S 7000 : Schulz-Skands at 7000 GeV (Mar 2011) 362 S 1960 : Schulz-Skands at 1960 GeV (Mar 2011) 363 S 1800 : Schulz-Skands at 1800 GeV (Mar 2011) 364 S 900 : Schulz-Skands at 900 GeV (Mar 2011) 365 S 630 : Schulz-Skands at 630 GeV (Mar 2011) =========================================================

Tune Z1

Tune Z2

Tune S350

Tune S356

PYTUNE

CTEQ5L

CTEQ6L

CTEQ5L

CTEQ6L



PYTHIA 8 TunesPYTHIA 8 TunesCTEQ6L CTEQ6LMRST LO**

PT0 = PARP(82)

= PARP(90)

Tevatron LHC

R. Corke and T. Sjöstrand

pT0(W)=pT0(W/W0) = PARP(90) pT0 = PARP(82) W = Ecm



CMS UE DataCMS 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 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 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 || < 2.0. The data are corrected and compared with PYTHIA Tune Z1 at the generator level.

CMS

"Transverse" Charged Particle Density: dN/dd

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Very nice agreement!CMS corrected

data!CMS corrected

data!

CMSTune Z1



PYTHIA 6.4 Tune Z2PYTHIA 6.4 Tune Z2

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 || < 2.0. The data are corrected and compared with PYTHIA Tune Z2 at the generator level.

CMS preliminary 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 Z2 at the generator level.

Not good! Bad energy dependence!


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CMS correcteddata!



PYTHIA 8 Tune C4PYTHIA 8 Tune C4

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 || < 2.0. The data are corrected and compared with PYTHIA 8 Tune C4 at the generator level.

CMS preliminary 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 8 Tune C4 at the generator level.

Not good! PTsum too small!


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CMS correcteddata!



Transverse Ratio: PTsum/NchgTransverse Ratio: PTsum/Nchg

CMS preliminary data at 900 GeV and 7 TeV on the “transverse” ratio PTsum/Nchg as defined by the leading charged particle jet (chgjet#1) for charged particles with pT > 0.5 GeV/c and || < 2.0 compared with PYTHIA Tune Z1, Z2, and PY8C4 at the generator level.

Z1 good! PY8C4 and Z2 Bad!

"Transverse" Charged Particle Ratio: PTsum/Nchg

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Energy DependenceEnergy Dependence

CMS data on the energy dependence (7 TeV divided by 900 GeV) of 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 || < 2.0 compared with PYTHIA Tune Z1, Z2, and PY8C4 at the generator level.

CMS data on the energy dependence (7 TeV divided by 900 GeV) of 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 || < 2.0 compared with PYTHIA Tune Z1, Z2, and PY8C4 at the generator level.

Z1 and PY8C4 good! Z2 Bad!

"Transverse" Charged Particle Density: Ratio

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Z1Z2

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"Transverse" Charged PTsum Density: Ratio

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CMS correcteddata!

CMS correcteddata!

CTEQ5L: PARP(90) =0.275CTEQ6L: PARP(90) =0.275

CTEQ6L: PARP(90) = 0.19

Duh! The energy dependence depends on both PARP(90) and the structure function!



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.

ATLASATLAS

Tune Z1Tune Z1

ATLAS publication – arXiv:1012.0791December 3, 2010


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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, Tune S350, and Tune S356 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, Tune S350, and Tune S356 at the generator level.

ATLASATLAS

Tune S350 & S356 (Perugia 2011) fit theUE data at 900 GeV & 7 TeV very well!

Very similar to Tune Z1!



CMS-ATLAS UE DataCMS-ATLAS UE Data

CMS preliminary data at 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 together with the ATLAS published data at 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.


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CMS (red)ATLAS (blue)

RDF Preliminarydata corrected



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CMS (red)ATLAS (blue)

Amazing agreement!

Tune Z1

CMS: Chgjet#1

ATLAS: PTmax Tune Z1




ATLAS published data at 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 pT > 0.1 GeV/c (|| < 2.5). The data are corrected and compared with PYTHIA Tune Z1 at the generator level.

ATLAS published data at 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 pT > 0.1 GeV/c (|| < 2.5). The data are corrected and compared with PYTHIA Tune Z1 at the generator level.


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Tune Z1


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ATLAS publication – arXiv:1012.0791December 3, 2010

ATLAS ATLAS

Tune Z1

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

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

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Charge Particle Density

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pyS356 = dashed red

Here Tune S350 & S356 (Perugia 2011)are identical with Tune Z1!



ALICE UE DataALICE UE Data

ALICE 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 generrator level.

ALICE 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.

ALICE UE Data: Talk by S. ValleroMPI@LHC 2010 Glasgow, Scotland

November 30, 2010


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ALICETune Z1

ALICETune Z1

I read the points off with a ruler!




ATLAS 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 generrator level.

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 || < 0.8. The data are corrected and compared with PYTHIA Tune Z1 at the generator level.

ATLAS-CONF-2011-009February 21, 2011


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ALICE-ATLAS UEALICE-ATLAS UE

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 || < 0.8. The data are corrected and compared with PYTHIA Tune Z1 at the generrator level.



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ALICE-ATLAS UEALICE-ATLAS UE

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 || < 0.8. The data are corrected and compared with PYTHIA Tune Z1 at the generrator level.


ALICETune Z1


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ALICE-ATLAS UEALICE-ATLAS UE"Transverse" Charged Particle Density: dN/dd

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PYTHIA Tune Z1PYTHIA Tune Z1

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 Z1 after detector simulation.

CDF published 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. The data are corrected and compared with PYTHIA Tune Z1 at the generator level.


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Oops Tune Z1 is slightly high at CDF!

Tune Z1

Tune Z1



PYTHIA Tune Z1PYTHIA Tune Z1

MPI Cut-Off versus the Center-of Mass Energy Wcm: PYTHIA Tune Z1 was determined by fitting pT0 independently at 900 GeV and 7 TeV and calculating = PARP(90). The best fit to pT0 at CDF is slightly higher than the Tune Z1 curve. This is very preliminary! Perhaps with a global fit to all three energies (i.e. “Professor” tune) one can get a simultaneous fit to all three??

MPI Cut-Off PT0(Wcm)

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pT0(W)=pT0(W/W0)e



PYTHIA 8 TunesPYTHIA 8 TunesCTEQ6L CTEQ6LMRST LO**

PT0 = PARP(82)

= PARP(90)

Tevatron LHC

R. Corke and T. Sjöstrand




UE Summary & ConclusionsUE Summary & Conclusions We now have lots of corrected UE data from the LHC! Tune Z1 (CTEQ5L)

does nice job of fitting the CMS, ATLAS, and ALICE UE data at 900 GeV and 7 TeV! But Tune Z1 is a little high at CDF (1.96 TeV)! Tune S350 (Perugia 2011) is very similar to Tune Z1 (i.e. just as good on the UE).

Proton Proton

PT(hard)

Outgoing Parton

Outgoing Parton

Underlying Event Underlying Event

Initial-State Radiation

Final-State Radiation

CTEQ6L Tune: PYTHIA 6.4 Tune Z2 and PYTHIA 8 Tune C4 both use CTEQ6L, but do not fit the LHC UE data as well as Tune Z1. Tune S356 (Perugia 2011) is the best CTEQ6L tune so far!

Next Step: More PYTHIA 6.4 and PYTHIA 8 tunes. Time to look more closely at Sherpa and HERWIG++!

ATLAS Tuning Effort (A. Buckley, J. Katzy et al.): AMBT1, AUET1 (Herwig+Jimmy). Coming soon AUET2 (Herwig + Jimmy), AMBT2! Four stage approach: Flavor, FS fragmentation, ISR, MPI.

CMS GEN Group: Working on an improved Z2 tune (Tune Z2*) and an

improved PY8C4 tune (Tune C4*) using the Professor (A. Knutsson & M. Zakaria).

Sorry not enough time to show all the LHC tunes!

rick field university of florida

Documents

p2011 tev

ue common plots

tev data

bias common plots

particle level

skands w cteq6l1 pdfs

alice mb common plots

skands w cteq5l pdfs