1. LPCC MB&UE Meeting CERN June 17, 2011 Rick Field – Florida/CDF/CMSPage 1 Rick Field University of Florida UE&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.

2. LPCC MB&UE Meeting CERN June 17, 2011 Rick Field – Florida/CDF/CMSPage 2 MB 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

3. LPCC MB&UE Meeting CERN June 17, 2011 Rick Field – Florida/CDF/CMSPage 3 MB Common Plots 7 TeV Direct charged particles (including leptons) corrected to the particle level with no corrections for SD or DD. Last UE&MB Meeting

4. LPCC MB&UE Meeting CERN June 17, 2011 Rick Field – Florida/CDF/CMSPage 4 New ALICE Common Plots

5. LPCC MB&UE Meeting CERN June 17, 2011 Rick Field – Florida/CDF/CMSPage 5 MB Common Plots 7 TeV Direct charged particles (including leptons) corrected to the particle level with no corrections for SD or DD. Thanks to Regina for the plots! Thanks to ATLAS for the data!

6. LPCC MB&UE Meeting CERN June 17, 2011 Rick Field – Florida/CDF/CMSPage 6 Other Comparisons Direct charged particles (including leptons) corrected to the particle level with no correction for SD or DD. Thanks to Regina for the plot!

7. LPCC MB&UE Meeting CERN June 17, 2011 Rick Field – Florida/CDF/CMSPage 7 ALICE Common Plots

8. LPCC MB&UE Meeting CERN June 17, 2011 Rick Field – Florida/CDF/CMSPage 8 CMS Common Plots Observable900 GeV7 TeV MB1: dN chg /d  N chg ≥ 1 |  | 0.5 Gev/c & 1.0 GeV/c Done QCD-10-024 Done QCD-10-024 MB2: dN chg /dp T N chg ≥ 1 |  | < 0.8 Stalled MB3: Multiplicity Distribution |  | 0.5 GeV/c & 1.0 GeV/c Stalled MB4: versus Nchg |  | 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 |  | 0.5 GeV/c & 1.0 GeV/c In progress (M. Zakaria) In progress (M. Zakaria) Direct charged particles (including leptons) corrected to the particle level with no corrections for SD or DD.

9. LPCC MB&UE Meeting CERN June 17, 2011 Rick Field – Florida/CDF/CMSPage 9 PYTHIA 6.4.25 --------------------------------------------------------------------- 4th generation: tunes incorporating 7-TeV data --------------------------------------------------------------------- 340 AMBT1 : 1st ATLAS tune incl 7 TeV, w. LO* PDFs (2010) 341 Z1 : Retune of AMBT1 by Field w CTEQ5L PDFs (2010) 342 Z1-LEP : Retune of Z1 by Skands w CTEQ5L PDFs (2010) 343 Z2 : Retune of Z1 by Field w CTEQ6L1 PDFs (2010) 344 Z2-LEP : Retune of Z1 by Skands w CTEQ6L1 PDFs (2010) 350 Perugia 2011 : Retune of Perugia 2010 incl 7-TeV data (Mar 2011) 351 P2011 radHi : Variation with alphaS(pT/2) 352 P2011 radLo : Variation with alphaS(2pT) 353 P2011 mpiHi : Variation with more semi-hard MPI 354 P2011 noCR : Variation without color reconnections 355 P2011 LO** : Perugia 2011 using MSTW LO** PDFs (Mar 2011) 356 P2011 C6 : Perugia 2011 using CTEQ6L1 PDFs (Mar 2011) 357 P2011 T16 : Variation with PARP(90)=0.16 away from 7 TeV 358 P2011 T32 : Variation with PARP(90)=0.32 awat from 7 TeV 359 P2011 TeV : Perugia 2011 optimized for Tevatron (Mar 2011) 360 S Global : Schulz-Skands Global fit (Mar 2011) 361 S 7000 : Schulz-Skands at 7000 GeV (Mar 2011) 362 S 1960 : Schulz-Skands at 1960 GeV (Mar 2011) 363 S 1800 : Schulz-Skands at 1800 GeV (Mar 2011) 364 S 900 : Schulz-Skands at 900 GeV (Mar 2011) 365 S 630 : Schulz-Skands at 630 GeV (Mar 2011) ========================================================= Tune Z1 Tune Z2 Tune S350 Tune S356 PYTUNE CTEQ5L CTEQ6L CTEQ5L CTEQ6L

10. LPCC MB&UE Meeting CERN June 17, 2011 Rick Field – Florida/CDF/CMSPage 10 PYTHIA 8 Tunes CTEQ6L MRST LO** PT0 = PARP(82)  = PARP(90) Tevatron LHC R. Corke and T. Sjöstrand p T0 (W)=p T0 (W/W 0 )   = PARP(90) p T0 = PARP(82) W = E cm

11. LPCC MB&UE Meeting CERN June 17, 2011 Rick Field – Florida/CDF/CMSPage 11 CMS UE Data  CMS preliminary data at 900 GeV and 7 TeV on the “transverse” charged PTsum density, dPT/d  d , as defined by the leading charged particle jet (chgjet#1) for charged particles with p T > 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/d  d , as defined by the leading charged particle jet (chgjet#1) for charged particles with p T > 0.5 GeV/c and |  | < 2.0. The data are corrected and compared with PYTHIA Tune Z1 at the generator level. CMS Tune Z1 Very nice agreement! CMS corrected data! CMS corrected data! CMS Tune Z1

12. LPCC MB&UE Meeting CERN June 17, 2011 Rick Field – Florida/CDF/CMSPage 12 PYTHIA 6.4 Tune Z2  CMS preliminary data at 900 GeV and 7 TeV on the “transverse” charged particle density, dN/d  d , as defined by the leading charged particle jet (chgjet#1) for charged particles with p T > 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/d  d , as defined by the leading charged particle jet (chgjet#1) for charged particles with p T > 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! Tune Z2 CMS corrected data! CMS corrected data!

13. LPCC MB&UE Meeting CERN June 17, 2011 Rick Field – Florida/CDF/CMSPage 13 PYTHIA 8 Tune C4  CMS preliminary data at 900 GeV and 7 TeV on the “transverse” charged particle density, dN/d  d , as defined by the leading charged particle jet (chgjet#1) for charged particles with p T > 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/d  d , as defined by the leading charged particle jet (chgjet#1) for charged particles with p T > 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! PY8 Tune C4 CMS corrected data! CMS corrected data!

14. LPCC MB&UE Meeting CERN June 17, 2011 Rick Field – Florida/CDF/CMSPage 14 Transverse 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 p T > 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! Tune Z1 Tune Z2 PY8 Tune C4

15. LPCC MB&UE Meeting CERN June 17, 2011 Rick Field – Florida/CDF/CMSPage 15 Energy 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 p T > 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 p T > 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! CMS corrected data! CMS corrected data! CTEQ5L: PARP(90) =0.275 CTEQ6L: PARP(90) =0.275 CTEQ6L: PARP(90) = 0.19 Duh! The energy dependence depends on both PARP(90) and the structure function!

16. LPCC MB&UE Meeting CERN June 17, 2011 Rick Field – Florida/CDF/CMSPage 16 ATLAS UE Data  ATLAS published data at 900 GeV and 7 TeV on the “transverse” charged PTsum density, dPT/d  d , as defined by the leading charged particle (PTmax) for charged particles with p T > 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/d  d , as defined by the leading charged particle (PTmax) for charged particles with p T > 0.5 GeV/c and |  | < 2.5. The data are corrected and compared with PYTHIA Tune Z1 at the generator level. ATLAS Tune Z1 ATLAS publication – arXiv:1012.0791 December 3, 2010

17. LPCC MB&UE Meeting CERN June 17, 2011 Rick Field – Florida/CDF/CMSPage 17 ATLAS UE Data  ATLAS published data at 900 GeV and 7 TeV on the “transverse” charged PTsum density, dPT/d  d , as defined by the leading charged particle (PTmax) for charged particles with p T > 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/d  d , as defined by the leading charged particle (PTmax) for charged particles with p T > 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. ATLAS Tune S350 & S356 (Perugia 2011) fit the UE data at 900 GeV & 7 TeV very well! Very similar to Tune Z1!

18. LPCC MB&UE Meeting CERN June 17, 2011 Rick Field – Florida/CDF/CMSPage 18 CMS-ATLAS UE Data  CMS preliminary data at 7 TeV on the “transverse” charged particle density, dN/d  d , as defined by the leading charged particle jet (chgjet#1) for charged particles with p T > 0.5 GeV/c and |  | 0.5 GeV/c and |  | < 2.5 The data are corrected and compared with PYTHIA Tune Z1 at the generator level. Amazing agreement! Tune Z1 CMS: Chgjet#1 ATLAS: PTmax Tune Z1

19. LPCC MB&UE Meeting CERN June 17, 2011 Rick Field – Florida/CDF/CMSPage 19 ATLAS UE Data  ATLAS published data at 7 TeV on the “transverse” charged PTsum density, dPT/d  d , as defined by the leading charged particle (PTmax) for charged particles with p T > 0.5 GeV/c and p T > 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/d  d , as defined by the leading charged particle (PTmax) for charged particles with p T > 0.5 GeV/c and p T > 0.1 GeV/c (|  | < 2.5). The data are corrected and compared with PYTHIA Tune Z1 at the generator level. Tune Z1 ATLAS publication – arXiv:1012.0791 December 3, 2010 ATLAS Tune Z1 Here Tune S350 & S356 (Perugia 2011) are identical with Tune Z1!

20. LPCC MB&UE Meeting CERN June 17, 2011 Rick Field – Florida/CDF/CMSPage 20 ALICE UE Data  ALICE preliminary data at 900 GeV and 7 TeV on the “transverse” charged PTsum density, dPT/d  d , as defined by the leading charged particle (PTmax) for charged particles with p T > 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/d  d , as defined by the leading charged particle (PTmax) for charged particles with p T > 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. Vallero MPI@LHC 2010 Glasgow, Scotland November 30, 2010 ALICE Tune Z1 ALICE Tune Z1 I read the points off with a ruler!

21. LPCC MB&UE Meeting CERN June 17, 2011 Rick Field – Florida/CDF/CMSPage 21 ATLAS UE Data  ATLAS preliminary data at 900 GeV and 7 TeV on the “transverse” charged PTsum density, dPT/d  d , as defined by the leading charged particle (PTmax) for charged particles with p T > 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/d  d , as defined by the leading charged particle (PTmax) for charged particles with p T > 0.5 GeV/c and |  | < 0.8. The data are corrected and compared with PYTHIA Tune Z1 at the generator level. ATLAS-CONF-2011-009 February 21, 2011 ATLAS Tune Z1 ATLAS Tune Z1

22. LPCC MB&UE Meeting CERN June 17, 2011 Rick Field – Florida/CDF/CMSPage 22 ALICE-ATLAS UE  ATLAS preliminary data at 900 GeV and 7 TeV on the “transverse” charged particle density, dN/d  d , as defined by the leading charged particle (PTmax) for charged particles with p T > 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/d  d , as defined by the leading charged particle (PTmax) for charged particles with p T > 0.5 GeV/c and |  | < 0.8. The data are corrected and compared with PYTHIA Tune Z1 at the generator level. ALICE Tune Z1 ATLAS Tune Z1

23. LPCC MB&UE Meeting CERN June 17, 2011 Rick Field – Florida/CDF/CMSPage 23 ALICE-ATLAS UE  ATLAS preliminary data at 900 GeV and 7 TeV on the “transverse” charged particle density, dN/d  d , as defined by the leading charged particle (PTmax) for charged particles with p T > 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/d  d , as defined by the leading charged particle (PTmax) for charged particles with p T > 0.5 GeV/c and |  | < 0.8. The data are corrected and compared with PYTHIA Tune Z1 at the generator level. ALICE Tune Z1 ATLAS Tune Z1

24. LPCC MB&UE Meeting CERN June 17, 2011 Rick Field – Florida/CDF/CMSPage 24 ALICE-ATLAS UE

25. LPCC MB&UE Meeting CERN June 17, 2011 Rick Field – Florida/CDF/CMSPage 25 PYTHIA Tune Z1  CMS preliminary data at 900 GeV and 7 TeV on the “transverse” charged particle density, dN/d  d , as defined by the leading charged particle jet (chgjet#1) for charged particles with p T > 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/d  d , as defined by the leading calorimeter jet (jet#1) for charged particles with p T > 0.5 GeV/c and |  | < 1.0. The data are corrected and compared with PYTHIA Tune Z1 at the generator level. CMS CDF Oops Tune Z1 is slightly high at CDF! Tune Z1

26. LPCC MB&UE Meeting CERN June 17, 2011 Rick Field – Florida/CDF/CMSPage 26 PYTHIA Tune Z1  MPI Cut-Off versus the Center-of Mass Energy W cm : PYTHIA Tune Z1 was determined by fitting p T0 independently at 900 GeV and 7 TeV and calculating  = PARP(90). The best fit to p T0 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?? p T0 (W)=p T0 (W/W 0 )   = PARP(90) p T0 = PARP(82) W = E cm p T0 (W)=p T0 (W/W0) e

27. LPCC MB&UE Meeting CERN June 17, 2011 Rick Field – Florida/CDF/CMSPage 27 PYTHIA 8 Tunes CTEQ6L MRST LO** PT0 = PARP(82)  = PARP(90) Tevatron LHC R. Corke and T. Sjöstrand p T0 (W)=p T0 (W/W 0 )   = PARP(90) p T0 = PARP(82) W = E cm

28. LPCC MB&UE Meeting CERN June 17, 2011 Rick Field – Florida/CDF/CMSPage 28 UE 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).  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!