1. University of Virginia April 10, 2012 Rick Field – Florida/CDF/CMSPage 1 a Rick Field University of Florida Outline  How Universal are the QCD MC Model Tunes? Do we need a separate tune for each center-of-mass energy? 900 GeV, 1.96 TeV, 7 TeV, etc. Do we need a separate tune for each hard QCD subprocess? Jet Production, Drell-Yan Production, etc. The Energy Dependence of the Underlying Event  A close look at two PYTHIA tunes: PYTHIA 6.2 Tune DW (CDF UE tune). PYTHIA 6.4 Tune Z1 (CMS UE tune). CMS CDF Run 2  Review: The CDF Tevatron “underlying event” tunes (Tune A, B, D, AW, DW, D6, DWT, D6T).  New CDF UE Data: The Tevatron Energy Scan (300 GeV, 900 GeV, 1.96 TeV) 300 GeV, 900 GeV, 1.96 TeV 900 GeV, 7 TeV & 8 TeV Me My Thesis Advisor Dave Jackson Craig Group Craig’s Thesis Advisor

2. University of Virginia April 10, 2012 Rick Field – Florida/CDF/CMSPage 2 QCD Monte-Carlo Models: High Transverse Momentum Jets  Start with the perturbative 2-to-2 (or sometimes 2-to-3) parton-parton scattering and add initial and final- state gluon radiation (in the leading log approximation or modified leading log approximation). “Hard Scattering” Component “Underlying Event”  The “underlying event” consists of the “beam-beam remnants” and from particles arising from soft or semi-soft multiple parton interactions (MPI).  Of course the outgoing colored partons fragment into hadron “jet” and inevitably “underlying event” observables receive contributions from initial and final-state radiation. The “underlying event” is an unavoidable background to most collider observables and having good understand of it leads to more precise collider measurements!

3. University of Virginia April 10, 2012 Rick Field – Florida/CDF/CMSPage 3 QCD Monte-Carlo Models: Lepton-Pair Production  Start with the perturbative Drell-Yan muon pair production and add initial-state gluon radiation (in the leading log approximation or modified leading log approximation). “Underlying Event”  The “underlying event” consists of the “beam-beam remnants” and from particles arising from soft or semi-soft multiple parton interactions (MPI).  Of course the outgoing colored partons fragment into hadron “jet” and inevitably “underlying event” observables receive contributions from initial-state radiation. “Hard Scattering” Component

4. University of Virginia April 10, 2012 Rick Field – Florida/CDF/CMSPage 4 MPI, Pile-Up, and Overlap  MPI: Additional 2-to-2 parton-parton scatterings within a single hadron-hadron collision. MPI: Multiple Parton Interactions Pile-Up Proton Interaction Region  z Proton  Pile-Up: More than one hadron-hadron collision in the beam crossing. Overlap  Overlap: An experimental timing issue where a hadron-hadron collision from the next beam crossing gets included in the hadron- hadron collision from the current beam crossing because the next crossing happened before the event could be read out.

5. University of Virginia April 10, 2012 Rick Field – Florida/CDF/CMSPage 5 Traditional 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 P T > PT min |  | <  cut  Define |  | 120 o as “Away”. Leading Calorimeter Jet or Leading Charged Particle Jet or Leading Charged Particle or Z-Boson  All three regions have the same area in  -  space,  ×  = 2  cut ×120 o = 2  cut ×2  /3. Construct densities by dividing by the area in  -  space. “Transverse” region very sensitive to the “underlying event”! CDF Run 1 Analysis

6. University of Virginia April 10, 2012 Rick Field – Florida/CDF/CMSPage 6 Default parameters give very poor description of the “underlying event”! Note Change PARP(67) = 4.0 (< 6.138) PARP(67) = 1.0 (> 6.138) Parameter6.1156.1256.1586.206 MSTP(81)1111 MSTP(82)1111 PARP(81)1.41.9 PARP(82)1.552.1 1.9 PARP(89)1,000 PARP(90)0.16 PARP(67)4.0 1.0  Plot shows the “Transverse” charged particle density versus P T (chgjet#1) compared to the QCD hard scattering predictions of PYTHIA 6.206 (P T (hard) > 0) using the default parameters for multiple parton interactions and CTEQ3L, CTEQ4L, and CTEQ5L. PYTHIA default parameters PYTHIA 6.206 Defaults MPI constant probability scattering

7. University of Virginia April 10, 2012 Rick Field – Florida/CDF/CMSPage 7 ParameterDefaultDescription PARP(83)0.5Double-Gaussian: Fraction of total hadronic matter within PARP(84) PARP(84)0.2Double-Gaussian: Fraction of the overall hadron radius containing the fraction PARP(83) of the total hadronic matter. PARP(85)0.33Probability that the MPI produces two gluons with color connections to the “nearest neighbors. PARP(86)0.66Probability 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. PARP(89)1 TeVDetermines the reference energy E 0. PARP(82)1.9 GeV/c The cut-off P T0 that regulates the 2-to-2 scattering divergence 1/PT 4 →1/(PT 2 +P T0 2 ) 2 PARP(90)0.16Determines the energy dependence of the cut-off P T0 as follows P T0 (E cm ) = P T0 (E cm /E 0 )  with  = PARP(90) PARP(67)1.0A scale factor that determines the maximum parton virtuality for space-like showers. The larger the value of PARP(67) the more initial- state radiation. Hard Core Take E 0 = 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: Multiple Parton Interaction Parameters Determines the energy dependence of the MPI!

8. University of Virginia April 10, 2012 Rick Field – Florida/CDF/CMSPage 8 “Transverse” Charged Densities Energy Dependence  Shows the “transverse” charged PT sum density (|  | 0.4 GeV) versus P T (charged jet#1) at 630 GeV predicted by HERWIG 6.4 (P T (hard) > 3 GeV/c, CTEQ5L) and a tuned version of PYTHIA 6.206 (P T (hard) > 0, CTEQ5L, Set A,  = 0,  = 0.16 (default) and  = 0.25 (preferred)).  Also shown are the PT sum densities (0.16 GeV/c and 0.54 GeV/c) determined from the Tano, Kovacs, Huston, and Bhatti “transverse” cone analysis at 630 GeV. Lowering P T0 at 630 GeV (i.e. increasing  ) increases UE activity resulting in less energy dependence. Increasing  produces less energy dependence for the UE resulting in less UE activity at the LHC! Reference point E 0 = 1.8 TeV Rick Field Fermilab MC Workshop October 4, 2002!

9. University of Virginia April 10, 2012 Rick Field – Florida/CDF/CMSPage 9 CDF Run 1 P T (Z)  Shows the Run 1 Z-boson p T distribution ( ≈ 11.5 GeV/c) compared with PYTHIA Tune A ( = 9.7 GeV/c), Tune A25 ( = 10.1 GeV/c), and Tune A50 ( = 11.2 GeV/c). ParameterTune ATune A25Tune A50 MSTP(81)111 MSTP(82)444 PARP(82)2.0 GeV PARP(83)0.5 PARP(84)0.4 PARP(85)0.9 PARP(86)0.95 PARP(89)1.8 TeV PARP(90)0.25 PARP(67)4.0 MSTP(91)111 PARP(91)1.02.55.0 PARP(93)5.015.025.0 UE Parameters ISR Parameter Intrensic KT PYTHIA 6.2 CTEQ5L Vary the intrensic KT!

10. University of Virginia April 10, 2012 Rick Field – Florida/CDF/CMSPage 10 CDF Run 1 P T (Z)  Shows the Run 1 Z-boson p T distribution ( ≈ 11.5 GeV/c) compared with PYTHIA Tune A ( = 9.7 GeV/c), and PYTHIA Tune AW ( = 11.7 GeV/c). ParameterTune ATune AW MSTP(81)11 MSTP(82)44 PARP(82)2.0 GeV PARP(83)0.5 PARP(84)0.4 PARP(85)0.9 PARP(86)0.95 PARP(89)1.8 TeV PARP(90)0.25 PARP(62)1.01.25 PARP(64)1.00.2 PARP(67)4.0 MSTP(91)11 PARP(91)1.02.1 PARP(93)5.015.0 The Q 2 = k T 2 in  s for space-like showers is scaled by PARP(64)! Effective Q cut-off, below which space-like showers are not evolved. UE Parameters ISR Parameters Intrensic KT PYTHIA 6.2 CTEQ5L Tune used by the CDF-EWK group!

11. University of Virginia April 10, 2012 Rick Field – Florida/CDF/CMSPage 11 Jet-Jet Correlations (DØ) Jet#1-Jet#2  Distribution  Jet#1-Jet#2  MidPoint Cone Algorithm (R = 0.7, f merge = 0.5)  L = 150 pb -1 (Phys. Rev. Lett. 94 221801 (2005))  Data/NLO agreement good. Data/HERWIG agreement good.  Data/PYTHIA agreement good provided PARP(67) = 1.0→4.0 (i.e. like Tune A, best fit 2.5).

12. University of Virginia April 10, 2012 Rick Field – Florida/CDF/CMSPage 12 CDF Run 1 P T (Z)  Shows the Run 1 Z-boson p T distribution ( ≈ 11.5 GeV/c) compared with PYTHIA Tune DW, and HERWIG. ParameterTune DWTune AW MSTP(81)11 MSTP(82)44 PARP(82)1.9 GeV2.0 GeV PARP(83)0.5 PARP(84)0.4 PARP(85)1.00.9 PARP(86)1.00.95 PARP(89)1.8 TeV PARP(90)0.25 PARP(62)1.25 PARP(64)0.2 PARP(67)2.54.0 MSTP(91)11 PARP(91)2.1 PARP(93)15.0 UE Parameters ISR Parameters Intrensic KT PYTHIA 6.2 CTEQ5L Tune DW has a lower value of PARP(67) and slightly more MPI! Tune DW uses D0’s perfered value of PARP(67)!

13. University of Virginia April 10, 2012 Rick Field – Florida/CDF/CMSPage 13 PYTHIA 6.2 Tunes ParameterTune AWTune DWTune D6 PDFCTEQ5L CTEQ6L MSTP(81)111 MSTP(82)444 PARP(82)2.0 GeV1.9 GeV1.8 GeV PARP(83)0.5 PARP(84)0.4 PARP(85)0.91.0 PARP(86)0.951.0 PARP(89)1.8 TeV PARP(90)0.25 PARP(62)1.25 PARP(64)0.2 PARP(67)4.02.5 MSTP(91)111 PARP(91)2.1 PARP(93)15.0 Intrinsic KT ISR Parameter UE Parameters Uses CTEQ6L All use LO  s with  = 192 MeV! Tune A energy dependence!

14. University of Virginia April 10, 2012 Rick Field – Florida/CDF/CMSPage 14 PYTHIA 6.2 Tunes ParameterTune DWTTune D6TATLAS PDFCTEQ5LCTEQ6LCTEQ5L MSTP(81)111 MSTP(82)444 PARP(82)1.9409 GeV1.8387 GeV1.8 GeV PARP(83)0.5 PARP(84)0.4 0.5 PARP(85)1.0 0.33 PARP(86)1.0 0.66 PARP(89)1.96 TeV 1.0 TeV PARP(90)0.16 PARP(62)1.25 1.0 PARP(64)0.2 1.0 PARP(67)2.5 1.0 MSTP(91)111 PARP(91)2.1 1.0 PARP(93)15.0 5.0 Intrinsic KT ISR Parameter UE Parameters All use LO  s with  = 192 MeV! ATLAS energy dependence! Tune A Tune AW Tune B Tune BW Tune D Tune DW Tune D6 Tune D6T

15. University of Virginia April 10, 2012 Rick Field – Florida/CDF/CMSPage 15 “Transverse” Charged Density  Shows the charged particle density in the “transverse” region for charged particles (p T > 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.

16. University of Virginia April 10, 2012 Rick Field – Florida/CDF/CMSPage 16 Min-Bias “Associated” Charged Particle Density  Shows the “associated” charged particle density in the “transverse” region as a function of PTmax for charged particles (p T > 0.5 GeV/c, |  | < 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). RHIC Tevatron 0.2 TeV → 1.96 TeV (UE increase ~2.7 times) LHC 1.96 TeV → 14 TeV (UE increase ~1.9 times) Linear scale! RHIC Tevatron 900 GeV LHC7 LHC14 LHC10

17. University of Virginia April 10, 2012 Rick Field – Florida/CDF/CMSPage 17 Min-Bias “Associated” Charged Particle Density  Shows the “associated” charged particle density in the “transverse” region as a function of PTmax for charged particles (p T > 0.5 GeV/c, |  | < 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! RHIC Tevatron 900 GeV LHC7 LHC14 LHC10 LHC7 LHC14 7 TeV → 14 TeV (UE increase ~20%) Linear on a log plot!

18. University of Virginia April 10, 2012 Rick Field – Florida/CDF/CMSPage 18 Conclusions November 2009  We are making good progress in understanding and modeling the “underlying event”. RHIC data at 200 GeV are very important!  It is clear now that the default value PARP(90) = 0.16 is not correct and the value should be closer to the Tune A value of 0.25.  The new Pythia p T ordered tunes (py64 S320 and py64 P329) are very similar to Tune A, Tune AW, and Tune DW. At present the new tunes do not fit the data better than Tune AW and Tune DW. However, the new tune are theoretically preferred!  Need to measure “Min-Bias” and the “underlying event” at the LHC as soon as possible to see if there is new QCD physics to be learned!  All tunes with the default value PARP(90) = 0.16 are wrong and are overestimating the activity of min-bias and the underlying event at the LHC! This includes all my “T” tunes and the (old) ATLAS tunes! UE&MB@CMS  The new and old PYTHIA tunes are beginning to converge and I believe we are finally in a position to make some legitimate predictions at the LHC!

19. University of Virginia April 10, 2012 Rick Field – Florida/CDF/CMSPage 19 “Transverse” Charged Particle Density  Fake data (from MC) at 900 GeV on the “transverse” charged particle density, dN/d  d , as defined by the leading charged particle (PTmax) and the leading charged particle jet (chgjet#1) for charged particles with p T > 0.5 GeV/c and |  | < 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). Rick Field MB&UE@CMS Workshop CERN, November 6, 2009 Leading Charged Particle Jet, chgjet#1. Leading Charged Particle, PTmax. Prediction!

20. University of Virginia April 10, 2012 Rick Field – Florida/CDF/CMSPage 20 “Transverse” Charge Density LHC 900 GeV LHC 7 TeV 900 GeV → 7 TeV (UE increase ~ factor of 2)  Shows the charged particle density in the “transverse” region for charged particles (p T > 0.5 GeV/c, |  | < 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 Prediction!

21. University of Virginia April 10, 2012 Rick Field – Florida/CDF/CMSPage 21 “Transverse” Charged Particle Density  Fake data (from MC) at 900 GeV on the “transverse” charged particle density, dN/d  d , as defined by the leading charged particle (PTmax) and the leading charged particle jet (chgjet#1) for charged particles with p T > 0.5 GeV/c and |  | < 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).  CMS preliminary data at 900 GeV on the “transverse” charged particle density, dN/d  d , as defined by the leading charged particle (PTmax) and 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 DW after detector simulation (216,215 events in the plot). Real Data! Monte-Carlo!

22. University of Virginia April 10, 2012 Rick Field – Florida/CDF/CMSPage 22 “Transverse” Charged PTsum Density  Fake data (from MC) at 900 GeV on the “transverse” charged PTsum density, dPT/d  d , as defined by the leading charged particle (PTmax) and the leading charged particle jet (chgjet#1) for charged particles with p T > 0.5 GeV/c and |  | < 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).  CMS preliminary data at 900 GeV on the “transverse” charged PTsum density, dPT/d  d , as defined by the leading charged particle (PTmax) and 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 DW after detector simulation (216,215 events in the plot). Real Data! Monte-Carlo!

23. University of Virginia April 10, 2012 Rick Field – Florida/CDF/CMSPage 23 PYTHIA Tune DW  Ratio of 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 DW after detector simulation. CMS  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 DW after detector simulation. CMS Ratio

24. University of Virginia April 10, 2012 Rick Field – Florida/CDF/CMSPage 24 PYTHIA Tune DW  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 |  | < 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/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 DW after detector simulation. CMS ATLAS

25. University of Virginia April 10, 2012 Rick Field – Florida/CDF/CMSPage 25 PYTHIA Tune DW  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. 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/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 DW at the generator level. CMS ATLAS

26. University of Virginia April 10, 2012 Rick Field – Florida/CDF/CMSPage 26 Charged Particle Density  CDF data at 1.96 TeV on the density of charged particles, dN/d  d , with p T > 0.5 GeV/c and |  | < 1 for Drell-Yan production as a function of P T (Z) for the “toward”, “away”, and “transverse” regions compared with PYTHIA Tune DW.  CMS data at 7 TeV on the density of charged particles, dN/d  d , with p T > 0.5 GeV/c and |  | < 2 for Drell- Yan production as a function of P T (Z) for the “toward”, “away”, and “transverse” regions compared with PYTHIA Tune DW. CDF: Proton-Antiproton Collisions at 1.96 GeV Lepton Cuts: p T > 20 GeV |  | < 1.0 Mass Cut: 70 < M(lepton-pair) < 110 GeV Charged Particles: p T > 0.5 GeV/c |  | < 1.0 CMS: Proton-Proton Collisions at 7 GeV Lepton Cuts: p T > 20 GeV |  | < 2.4 Mass Cut: 60 < M(lepton-pair) < 120 GeV Charged Particles: p T > 0.5 GeV/c |  | < 2.0 CMS Large increase in the UE in going from 1.96 TeV to 7 TeV as predicted by PYTHIA Tune DW!

27. University of Virginia April 10, 2012 Rick Field – Florida/CDF/CMSPage 27 Charged PTsum Density  CDF data at 1.96 TeV on the charged PTsum density, dPT/d  d , with p T > 0.5 GeV/c and |  | < 1 for Drell- Yan production as a function of PT(Z) for the “toward”, “away”, and “transverse” regions compared with PYTHIA Tune DW.  CMS data at 7 TeV on the charged PTsum density, dPT/d  d , with p T > 0.5 GeV/c and |  | < 1 for Drell-Yan production as a function of PT(Z) for the “toward”, “away”, and “transverse” regions compared with PYTHIA Tune DW. CMS Large increase in the UE in going from 1.96 TeV to 7 TeV as predicted by PYTHIA Tune DW!

28. University of Virginia April 10, 2012 Rick Field – Florida/CDF/CMSPage 28 PYTHIA Tune DW CMS Overall PYTHIA Tune DW is in amazingly good agreement with the Tevatron Jet production and Drell-Yan data and did a very good job in predicting the LHC Jet production and Drell-Yan data! (although not perfect)

29. University of Virginia April 10, 2012 Rick Field – Florida/CDF/CMSPage 29 PYTHIA Tune Z1  I believe that it is time to move to PYTHIA 6.4 (p T -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@CMS  All my previous tunes (A, DW, DWT, D6, D6T, CW, X1, and X2) were PYTHIA 6.4 tunes using the old Q 2 -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!

30. University of Virginia April 10, 2012 Rick Field – Florida/CDF/CMSPage 30 PYTHIA Tune Z1 Parameter Tune Z1 (R. Field CMS) Tune AMBT1 (ATLAS) Parton Distribution FunctionCTEQ5LLO* PARP(82) – MPI Cut-off1.9322.292 PARP(89) – Reference energy, E01800.0 PARP(90) – MPI Energy Extrapolation0.2750.25 PARP(77) – CR Suppression1.016 PARP(78) – CR Strength0.538 PARP(80) – Probability colored parton from BBR0.1 PARP(83) – Matter fraction in core0.356 PARP(84) – Core of matter overlap0.651 PARP(62) – ISR Cut-off1.025 PARP(93) – primordial kT-max10.0 MSTP(81) – MPI, ISR, FSR, BBR model21 MSTP(82) – Double gaussion matter distribution44 MSTP(91) – Gaussian primordial kT11 MSTP(95) – strategy for color reconnection66 Parameters not shown are the PYTHIA 6.4 defaults!

31. University of Virginia April 10, 2012 Rick Field – Florida/CDF/CMSPage 31 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

32. University of Virginia April 10, 2012 Rick Field – Florida/CDF/CMSPage 32 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

33. University of Virginia April 10, 2012 Rick Field – Florida/CDF/CMSPage 33 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

34. University of Virginia April 10, 2012 Rick Field – Florida/CDF/CMSPage 34 Jet 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 p T > 0.5 GeV/c and |  | 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 higher for large jet radius! Tune Z1 It seems that large jet radius “biases” the UE to be more active!

35. University of Virginia April 10, 2012 Rick Field – Florida/CDF/CMSPage 35 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!

36. University of Virginia April 10, 2012 Rick Field – Florida/CDF/CMSPage 36 PYTHIA Tune Z1  CDF data at 1.96 TeV on the density of charged particles, dN/d  d , with p T > 0.5 GeV/c and |  | < 1 for Drell-Yan production as a function of P T (Z) for the “toward”, “away”, and “transverse” regions compared with PYTHIA Tune Z1.  CMS data at 7 TeV on the density of charged particles, dN/d  d , with p T > 0.5 GeV/c and |  | < 2 for Drell- Yan production as a function of P T (Z) for the “toward”, “away”, and “transverse” regions compared with PYTHIA Tune Z1. Tune Z1 describes the energy dependence fairly well! CMS

37. University of Virginia April 10, 2012 Rick Field – Florida/CDF/CMSPage 37 PYTHIA Tune Z1  CDF data at 1.96 TeV on the charged PTsum density, dPT/d  d , with p T > 0.5 GeV/c and |  | < 1 for Drell- Yan production as a function of P T (Z) for the “toward”, “away”, and “transverse” regions compared with PYTHIA Tune Z1.  CMS data at 7 TeV on the charged PTsum density, dPT/d  d , with p T > 0.5 GeV/c and |  | < 2 for Drell-Yan production as a function of P T (Z) for the “toward”, “away”, and “transverse” regions compared with PYTHIA Tune Z1. CMS

38. University of Virginia April 10, 2012 Rick Field – Florida/CDF/CMSPage 38 PYTHIA Tune Z1  CMS data at 900 GeV 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. Tune Z1  CDF 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. Tune Z1

39. University of Virginia April 10, 2012 Rick Field – Florida/CDF/CMSPage 39 PYTHIA Tune Z1  CDF data at 1.96 TeV on the “transverse” charged PTsum density, dPT/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 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. Tune Z1

40. University of Virginia April 10, 2012 Rick Field – Florida/CDF/CMSPage 40 PYTHIA Tune Z1 Tune Z1

41. University of Virginia April 10, 2012 Rick Field – Florida/CDF/CMSPage 41 PYTHIA Tune Z1 Tune Z1 Overall amazingly good agreement with the LHC and Tevatron Jet production and Drell-Yan! (although not perfect yet)

42. University of Virginia April 10, 2012 Rick Field – Florida/CDF/CMSPage 42 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.

43. University of Virginia April 10, 2012 Rick Field – Florida/CDF/CMSPage 43 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.

44. University of Virginia April 10, 2012 Rick Field – Florida/CDF/CMSPage 44 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

45. University of Virginia April 10, 2012 Rick Field – Florida/CDF/CMSPage 45 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

46. University of Virginia April 10, 2012 Rick Field – Florida/CDF/CMSPage 46 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

47. University of Virginia April 10, 2012 Rick Field – Florida/CDF/CMSPage 47 Tevatron Energy Scan  Just before the shutdown of the Tevatron CDF has collected more than 10M “min-bias” events at several center-of-mass energies! 1.96 TeV 300 GeV 300 GeV 12.1M MB Events 900 GeV 54.3M MB Events 900 GeV

48. University of Virginia April 10, 2012 Rick Field – Florida/CDF/CMSPage 48 New CDF Energies  Predictions for CDF 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 from PYTHIA Tune Z1 at the generator 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. Tune Z1  Very very preliminary CDF data at 900 GeV and 1.96 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 |  | < 1.0.

49. University of Virginia April 10, 2012 Rick Field – Florida/CDF/CMSPage 49 My CDF UE Plan  Produce the CDF PTmax UE “common plots” at 900 GeV to compare with ALICE-ATLAS-CMS.  Study the energy dependence of the PTmax UE (300 GeV, 900 GeV, 1.96 TeV) at CDF. Must correct the data to the particle level!

50. University of Virginia April 10, 2012 Rick Field – Florida/CDF/CMSPage 50 My CDF MB Plan  Produce the CDF MB “common plots” at 900 GeV to compare with ALICE-ATLAS-CMS.  Study the energy dependence of MB (300 GeV, 900 GeV, 1.96 TeV) at CDF. I would be very happy if someone would help with the MB. It comes along with the UE analysis without much extra work!