Tevatron Energy Scan. Energy Dependence of the Underlying Event. Rick Field Craig Group & David Wilson University of Florida

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1 Rick Field Craig Group & David Wilson University of Florida Tevatron Energy Scan Energy Dependence of the Underlying Event Outline of Talk Wine & Cheese talk, October 4, Studying the underlying event (UE) at CDF. The PYTHIA UE tunes. LPCC MB&UE working group common plots. CDF MB common plots from the Tevatron Energy Scan. CDF UE common plots from the Tevatron Energy Scan. Mapping out the energy dependence of MB & UE: Tevatron to the LHC! CDF new UE observables from the Tevatron Energy Scan. Summary & Conclusions. Underlying Event Outgoing Parton CDF Run GeV,, 1.96 TeV Final-State Radiation Outgoing Parton PT(hard) Initial-State Radiation Anti Underlying Event 1 mile CMS at the LHC, 7 & 8 TeV Rick Field Florida/CDF/CMS Page 1 CDF Anti

2 2002 Wine & Cheese Talk Rick Field Wine & Cheese Talk October 4, 2002 Studying the underlying event at CDF! Rick Field Florida/CDF/CMS Page 2

3 UE Publications "Underlying Event" Publications Others RDF Number Year Publications with underlying event in the title. Rick Field Florida/CDF/CMS Page 3

4 UE Publications "Underlying Event" Publications 25 Others CDF Collaboration, RDF coming soon (I hope)! 20 Tevatron Energy Scan: Findings & Surprises, Number Year Publications with underlying event in the title. The Underlying Event in Large Transverse Momentum Charged Jet and Z boson Production at CDF, R. Field, published in the proceedings of DPF Charged Jet Evolution and the Underlying Event in -Antiproton Collisions at 1.8 TeV, CDF Collaboration, Phys. Rev. D65 (2002) Rick Field Florida/CDF/CMS Page 4

5 QCD Monte-Carlo Models: High Transverse Momentum Jets Hard Scattering Initial-State Radiation Outgoing Parton PT(hard) Hard Scattering Jet Jet Initial-State Radiation Outgoing Parton PT(hard) Hard Scattering Component Underlying Event Anti Underlying Event Outgoing Parton Final-State Radiation Outgoing Parton Jet Final-State Radiation Underlying Event Anti Underlying Event Underlying Event Start with the perturbative 2-to-2 (or sometimes 2-to-3) parton-parton scattering and add initial and finalstate gluon radiation (in the leading log approximation or modified leading log approximation). The underlying event consists of the beam-beam remnants and from particles arising from soft or semi-soft multiple parton interactions (MPI). The underlying event is an unavoidable Of course the outgoing colored partons fragment into hadron jet and inevitably underlying event background to most collider observables observables receive contributions from initial and final-state radiation. and having good understand of it leads to more precise collider measurements! Rick Field Florida/CDF/CMS Page 5

6 Occasionally one of the parton-parton collisions is hard (p T > 2 GeV/c) The Inelastic Non-Diffractive Cross-Section Majority of minbias events! Semi-hard partonparton collision (p T < 2 GeV/c) Multiple-parton interactions (MPI)! Rick Field Florida/CDF/CMS Page 6

7 The Underlying Event Select inelastic non-diffractive events that contain a hard scattering Hard parton-parton collisions is hard (p T > 2 GeV/c) The underlying-event (UE)! 1/(p T ) 4 1/(p T 2 +p T0 2 ) 2 Semi-hard partonparton collision (p T < 2 GeV/c) + Given that you have one hard scattering it is more probable to have MPI! Hence, the UE has more activity than min-bias. + + Multiple-parton Rick Field Florida/CDF/CMS interactions (MPI)! Page 7

8 Allow leading hard scattering to go to zero p T with same cut-off as the MPI! Model of σnd Model of the inelastic nondiffractive cross section! 1/(p T ) 4 1/(p T 2 +p T0 2 ) 2 Semi-hard partonparton collision (p T < 2 GeV/c) Multiple-parton interactions (MPI)! Rick Field Florida/CDF/CMS Page 8

9 UE Tunes Underlying Event Allow primary hard-scattering to go to p T = 0 with same cut-off! Fit the underlying event in a hard scattering process. 1/(p T ) 4 1/(p T 2 +p T0 2 ) 2 Min-Bias (add (ND) single & double diffraction) + Predict MB (ND)! Rick Field Florida/CDF/CMS Page 9

10 UE Tunes Underlying Event Allow primary hard-scattering to go to p T = 0 with same cut-off! Fit the underlying event in a hard scattering process. 1/(p T ) 4 1/(p T 2 +p T0 2 ) 2 Min-Bias (add (ND) single & double diffraction) + Predict MB (ND)! Predict MB (IN)! + + Single Diffraction M + Double Diffraction M 2 M 1 Rick Field Florida/CDF/CMS Page 10

11 Parameter Default Tuning PYTHIA 6.2: Multiple Parton Interaction Parameters Description PARP(83) PARP(84) PARP(85) Double-Gaussian: Fraction of total hadronic matter within PARP(84) Double-Gaussian: Fraction of the overall hadron radius containing the fraction PARP(83) of the total hadronic matter. Probability that the MPI produces two gluons with color connections to the nearest neighbors. Hard Core Color String Multiple Parton Interaction Color String PARP(86) 0.66 Probability 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. Multiple Parton Interaction Color String PARP(89) PARP(82) PARP(90) 1 TeV 1.9 GeV/c 0.16 Determines the reference energy E 0. The cut-off P T0 that regulates the 2-to-2 scattering divergence 1/PT 4 1/(PT 2 +P T0 2 ) 2 Determines the energy dependence of the cut-off P T0 as follows P T0 (E cm ) = P T0 (E cm /E 0 ) ε with ε = PARP(90) PT0 (GeV/c) PYTHIA Hard-Scattering Cut-Off PT0 Take E 0 = 1.8 TeV ε = 0.25 (Set A)) PARP(67) A scale factor that determines the maximum parton virtuality for space-like showers. The larger the value of PARP(67) the more initialstate radiation. ε = 0.16 (default) ,000 10, ,000 Reference point at 1.8 TeV CM Energy W (GeV) Rick Field Florida/CDF/CMS Page 11

12 Parameter Default Tuning PYTHIA 6.2: Multiple Parton Interaction Parameters Description PARP(83) PARP(84) PARP(85) Double-Gaussian: Fraction of total hadronic matter within PARP(84) Double-Gaussian: Fraction of the overall hadron radius containing the fraction PARP(83) of the total hadronic matter. Determines the energy Probability that the MPI produces two gluons dependence of the MPI! with color connections to the nearest neighbors. Hard Core Color String Multiple Parton Interaction Color String PARP(86) 0.66 Probability that Affects the MPI the produces amount two of gluons either as described initial-state by PARP(85) radiation! or as a closed gluon loop. The remaining fraction consists of quark-antiquark pairs. Multiple Parton Determine Interaction by comparing with 630 GeV data! Color String PARP(89) PARP(82) PARP(90) 1 TeV 1.9 GeV/c 0.16 Determines the reference energy E 0. The cut-off P T0 that regulates the 2-to-2 scattering divergence 1/PT 4 1/(PT 2 +P T0 2 ) 2 Determines the energy dependence of the cut-off P T0 as follows P T0 (E cm ) = P T0 (E cm /E 0 ) ε with ε = PARP(90) PT0 (GeV/c) PYTHIA Hard-Scattering Cut-Off PT0 Take E 0 = 1.8 TeV ε = 0.25 (Set A)) PARP(67) A scale factor that determines the maximum parton virtuality for space-like showers. The larger the value of PARP(67) the more initialstate radiation. ε = 0.16 (default) ,000 10, ,000 Reference point at 1.8 TeV CM Energy W (GeV) Rick Field Florida/CDF/CMS Page 12

13 Parameter PARP(83) PARP(84) PARP(85) PARP(86) PARP(89) PARP(82) PARP(90) PARP(67) Default TeV 1.9 GeV/c 0.16 Tuning PYTHIA 6.2: Multiple Parton Interaction Parameters Description Double-Gaussian: Fraction of total hadronic matter within PARP(84) Double-Gaussian: Fraction of the overall hadron radius containing the fraction PARP(83) of the total hadronic matter. Determines the energy Probability that the MPI produces two gluons dependence of the MPI! with color connections to the nearest neighbors. Probability that Affects the MPI the produces amount two of gluons either as described initial-state by PARP(85) radiation! or as a closed gluon loop. The remaining fraction consists of quark-antiquark pairs. Determines the reference energy E 0. The cut-off P T0 that regulates the 2-to-2 scattering divergence 1/PT 4 1/(PT 2 +P T0 2 ) 2 Determines the energy dependence of the cut-off P T0 as follows P T0 (E cm ) = P T0 (E cm /E 0 ) ε with ε = PARP(90) A scale factor that determines the maximum parton virtuality for space-like showers. The larger the value of PARP(67) the more initialstate radiation. Hard Core Color String Remember the energy dependence of the underlying event activity depends on both the ε = PARP(90) and the PDF! 5 PT0 (GeV/c) Multiple Parton Interaction Color String Multiple Parton Determine Interaction by comparing with 630 GeV data! PYTHIA Color String Hard-Scattering Cut-Off PT0 Take E 0 = 1.8 TeV ε = 0.25 (Set A)) ε = 0.16 (default) ,000 10, ,000 Reference point at 1.8 TeV CM Energy W (GeV) Rick Field Florida/CDF/CMS Page 13

14 Traditional Approach Transverse region very sensitive to the underlying event! CDF Run 1 Analysis Charged Jet #1 Direction Toward-Side Jet φ Charged Particle φ Correlations P T > PT min η < η cut Leading Object Direction φ 2π Leading Calorimeter Jet or Leading Charged Particle Jet or Leading Charged Particle or Z-Boson Away Region Transverse Region Toward Toward φ Leading Object Transverse Transverse Transverse Transverse Toward Region Away Away Transverse Region Away-Side Jet Away Region 0 -η cut η +η cut Look at charged particle correlations in the azimuthal angle φ relative to a leading object (i.e. CaloJet#1, ChgJet#1, PTmax, Z-boson). For CDF PTmin = 0.5 GeV/c η cut = 1. Define φ φ < 60 o as Toward, 60 o < φ φ < 120 o as Transverse, and φ φ > 120 o as Away. All three regions have the same area in η-φ space, η φ φ = 2η cut 120 o = 2η cut 2π/3. Construct densities by dividing by the area in η-φ space. Rick Field Florida/CDF/CMS Page 14

15 UE Observables Transverse Charged Particle Density: Number of charged particles (p T > 0.5 GeV/c, η < η cut ) in the transverse region as defined by the leading charged particle, PTmax, divided by the area in η-φ space, 2η cut 2π/3, averaged over all events with at least one particle with p T > 0.5 GeV/c, η < η cut. Transverse Charged PTsum Density: Scalar p T sum of the charged particles (p T > 0.5 GeV/c, η < η cut ) in the transverse region as defined by the leading charged particle, PTmax, divided by the area in η-φ space, 2η cut 2π/3, averaged over all events with at least one particle with p T > 0.5 GeV/c, η < η cut. PTmax Direction Transverse Toward Away φ Transverse Transverse Charged Particle Average P T : Event-by-event <p T > = PTsum/Nchg for charged particles (p T > 0.5 GeV/c, η < η cut ) in the transverse region as defined by the leading charged particle, PTmax, averaged over all events with at least one particle in the transverse region with p T > 0.5 GeV/c, η < η cut. Zero Transverse Charged Particles: If there are no charged particles in the transverse region then Nchg and PTsum are zero and one includes these zeros in the average over all events with at least one particle with p T > 0.5 GeV/c, η < η cut. However, if there are no charged particles in the transverse region then the event is not used in constructing the transverse average p T. Rick Field Florida/CDF/CMS Page 15

16 PYTHIA Defaults MPI constant probability PYTHIA default parameters Parameter MSTP(81) 1 MSTP(82) 1 PARP(81) 1.4 PARP(82) PARP(89) 1,000 1,000 1,000 PARP(90) PARP(67) "Transverse" Charged Density scattering "Transverse" Charged Particle Density: dn/dηdφ CDF Data data uncorrected theory corrected Pythia (default) MSTP(82)=1 PARP(81) = 1.9 GeV/c PT(charged jet#1) (GeV/c) 1.8 TeV η < PT>0.5 GeV CTEQ3L CTEQ4L CTEQ5L CDF Min-Bias CDF JET20 Plot shows the Transverse charged particle density versus P T (chgjet#1) compared to the QCD hard scattering predictions of PYTHIA (P T (hard) > 0) using the default parameters for multiple parton interactions and CTEQ3L, CTEQ4L, and CTEQ5L. Note Change PARP(67) = 4.0 (< 6.138) PARP(67) = (> 6.138) Default parameters give very poor description of the underlying event! Rick Field Florida/CDF/CMS Page 16

17 Parameter MSTP(81) MSTP(82) PARP(81) PARP(82) PARP(89) PARP(90) PARP(67) PYTHIA Defaults MPI constant probability PYTHIA default parameters "Transverse" Charged Density "Transverse" Charged Particle Density: dn/dηdφ CDF Data data uncorrected theory corrected Pythia (default) MSTP(82)=1 PARP(81) = 1.9 GeV/c Remember the underlying event activity depends on both the 1,000 1, TeV η < PT>0.5 GeV 1,000 0 cut-off p T0 and the PDF! PT(charged jet#1) (GeV/c) scattering CTEQ3L CTEQ4L CTEQ5L CDF Min-Bias CDF JET20 Plot shows the Transverse charged particle density versus P T (chgjet#1) compared to the QCD hard scattering predictions of PYTHIA (P T (hard) > 0) using the default parameters for multiple parton interactions and CTEQ3L, CTEQ4L, and CTEQ5L. Note Change PARP(67) = 4.0 (< 6.138) PARP(67) = (> 6.138) Default parameters give very poor description of the underlying event! Rick Field Florida/CDF/CMS Page 17

18 Parameter MSTP(81) MSTP(82) PARP(82) PARP(83) PARP(84) PARP(85) PARP(86) PARP(89) PARP(90) PARP(67) TeV 0.25 New PYTHIA default (less initial-state radiation) Run 1 PYTHIA Tune A PYTHIA CTEQ5L Tune B GeV Tune A GeV TeV CDF Default Feburary 25, 2000! "Transverse" Charged Particle Density: dn/dηdφ "Transverse" Charged Density data uncorrected theory corrected CTEQ5L Plot shows the transverse charged particle density versus P T (chgjet#1) compared to the QCD hard scattering predictions of two tuned versions of PYTHIA (CTEQ5L, Set B (PARP(67)=1) and Set A (PARP(67)=4)). Old PYTHIA default (more initial-state radiation) PYTHIA (Set B) PARP(67)=1 PYTHIA (Set A) PARP(67)= PT(charged jet#1) (GeV/c) Run 1 Analysis 1.8 TeV η < PT>0.5 GeV Rick Field Florida/CDF/CMS Page 18

19 All use LO α s with Λ = 192 MeV! UE Parameters ISR Parameter PYTHIA 6.2 Tunes Parameter PDF MSTP(81) MSTP(82) PARP(82) PARP(83) PARP(84) PARP(85) PARP(86) PARP(89) PARP(90) PARP(62) PARP(64) PARP(67) MSTP(91) PARP(91) Tune AW CTEQ5L GeV TeV Tune DW CTEQ5L GeV TeV Tune D6 CTEQ6L GeV TeV Uses CTEQ6L Tune A energy dependence! PARP(93) Intrinsic KT Rick Field Florida/CDF/CMS Page 19

20 All use LO α s with Λ = 192 MeV! UE Parameters ISR Parameter Intrinsic KT PYTHIA 6.2 Tunes Parameter PDF MSTP(81) MSTP(82) PARP(82) PARP(83) PARP(84) PARP(85) PARP(86) PARP(89) PARP(90) PARP(62) PARP(64) PARP(67) MSTP(91) PARP(91) PARP(93) Tune DWT CTEQ5L GeV TeV Tune D6T CTEQ6L GeV TeV ATLAS CTEQ5L GeV TeV ATLAS energy dependence! Rick Field Florida/CDF/CMS Page 20

21 All use LO α s with Λ = 192 MeV! Tune A UE Parameters ISR Parameter Tune D Intrinsic KT PYTHIA 6.2 Tunes Parameter PDF MSTP(81) MSTP(82) PARP(82) PARP(83) Tune D6T CTEQ6L GeV 0.5 PARP(84) 0.5 Tune AW Tune B Tune BW PARP(85) 0.33 PARP(86) PARP(89) PARP(90) PARP(62) PARP(64) PARP(67) PARP(93) Tune DWT CTEQ5L MSTP(91) 1 PARP(91) Tune 2.1 DW GeV TeV TeV ATLAS CTEQ5L GeV TeV Tune D6 5.0 ATLAS energy dependence! Tune D6T Rick Field Florida/CDF/CMS Page 21

22 Transverse Charged Particle Density "Transverse" Charged Density RDF LHC Prediction! "Transverse" Charged Particle Density: dn/dηdφ RDF Preliminary generator level Min-Bias 1.96 TeV PY64 Tune S320 PY64 Tune P329 PY64 Tune N PY Tune A Charged Particles ( η <, PT>0.5 GeV/c) "Transverse" Charged Density "Transverse" Charged Particle Density: dn/dηdφ RDF Preliminary generator level PY ATLAS PY Tune A PY64 Tune S320 PY Tune DW Min-Bias 14 TeV Charged Particles ( η <, PT>0.5 GeV/c) PY64 Tune P329 PY Tune DWT PTmax Direction PTmax Direction φ φ Toward Toward Transverse Transverse Tevatron LHC Transverse Transverse Away Away Shows the associated charged particle density in the transverse region as a function of PTmax for charged particles (p T > 0.5 GeV/c, η < 1, not including PTmax) for min-bias events at 1.96 TeV from PYTHIA Tune A, Tune S320, Tune N324, and Tune P329 at the particle level (i.e. generator level). Extrapolations of PYTHIA Tune A, Tune DW, Tune DWT, Tune S320, Tune P329, and pyatlas to the LHC. Rick Field Florida/CDF/CMS Page 22

23 Transverse Charged Particle Density "Transverse" Charged Density RDF LHC Prediction! "Transverse" Charged Particle Density: dn/dηdφ RDF Preliminary generator level "Transverse" Charged Density "Transverse" Charged Particle Density: dn/dηdφ PY Tune A 0.8 PY64 Tune P329 PY64 Tune N324 PY Tune A PY64 Tune S320 PY64 Tune S320 PY Tune DW Min-Bias Min-Bias Charged Particles If the ( η <, LHC PT>0.5 GeV/c) data are 14 not TeV in 1.96 TeV Charged Particles ( η <, PT>0.5 GeV/c) the 14range shown 20 0here then PTmax Direction Transverse Toward Away PY64 Tune P329 φ Transverse Tevatron RDF Preliminary generator level we learn new (QCD) physics! Rick Field October 13, 2009 LHC PTmax Direction Transverse Toward Away PY ATLAS φ Transverse PY Tune DWT Shows the associated charged particle density in the transverse region as a function of PTmax for charged particles (p T > 0.5 GeV/c, η < 1, not including PTmax) for min-bias events at 1.96 TeV from PYTHIA Tune A, Tune S320, Tune N324, and Tune P329 at the particle level (i.e. generator level). Extrapolations of PYTHIA Tune A, Tune DW, Tune DWT, Tune S320, Tune P329, and pyatlas to the LHC. Rick Field Florida/CDF/CMS Page 23

24 Transverse Charged Particle Density "Transverse" Charged Density "Transverse" Charged Particle Density: dn/dηdφ RDF Preliminary py Tune DW generator level Min-Bias TeV 1.96 TeV 0.9 TeV 0.2 TeV 10 TeV 7 TeV Charged Particles ( η <, PT>0.5 GeV/c) "Transverse" Charged Density "Transverse" Charged Particle Density: dn/dηdφ RDF Preliminary py Tune DW generator level Tevatron RHIC LHC Center-of-Mass Energy (TeV) LHC10 PTmax = 5.25 GeV/c LHC14 Charged Particles ( η <, PT>0.5 GeV/c) RHIC PTmax Direction φ Toward Transverse Transverse 0.2 TeV 1.96 TeV (UE increase ~2.7 times) Tevatron PTmax Direction φ Toward Transverse Transverse 1.96 TeV 14 TeV (UE increase ~1.9 times) LHC PTmax Direction φ Toward Transverse Transverse Away Away Away Shows the associated charged particle density in the transverse region as a function of PTmax for charged particles (p T > 0.5 GeV/c, η < 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 Linear scale! particle level (i.e. generator level). Rick Field Florida/CDF/CMS Page 24

25 Transverse Charged Particle Density "Transverse" Charged Density "Transverse" Charged Particle Density: dn/dηdφ RDF Preliminary py Tune DW generator level Min-Bias Charged Particles ( η <, PT>0.5 GeV/c) TeV 1.96 TeV 0.9 TeV 0.2 TeV 10 TeV 7 TeV "Transverse" Charged Density "Transverse" Charged Particle Density: dn/dηdφ RDF Preliminary py Tune DW generator level RHIC Tevatron Charged Particles ( η <, PT>0.5 GeV/c) Center-of-Mass Energy (TeV) LHC14 LHC10 LHC7 PTmax = 5.25 GeV/c LHC7 PTmax Direction φ Toward Transverse Transverse Away 7 TeV 14 TeV (UE increase ~20%) Linear on a log plot! LHC14 PTmax Direction φ Toward Transverse Transverse Away Shows the associated charged particle density in the transverse region as a function of PTmax for charged particles (p T > 0.5 GeV/c, η < 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 Log scale! particle level (i.e. generator level). Rick Field Florida/CDF/CMS Page 25

26 Transverse Charge Density "Transverse" Charged Density "Transverse" Charged Particle Density: dn/dηdφ RDF Preliminary py Tune DW generator level Prediction! factor of 2! TeV Charged Particles ( η <2.0, PT>0.5 GeV/c) Rick Field MB&UE@CMS Workshop CERN, November 6, 2009 LHC PTmax Direction φ Toward Transverse Transverse Away 7 TeV (UE increase ~ factor of 2) ~ ~0.8 LHC 7 TeV PTmax Direction φ Toward Transverse Transverse Away Shows the charged particle density in the transverse region for charged particles (p T > 0.5 GeV/c, η < 2) at and 7 TeV as defined by PTmax from PYTHIA Tune DW and at the particle level (i.e. generator level). Rick Field Florida/CDF/CMS Page 26

27 PYTHIA Tune DW Charged Particle Density "Transverse" Charged Particle Density: dn/dηdφ CMS Preliminary data uncorrected pydw + SIM PT(chgjet#1) GeV/c "Transverse" Charged Density "Transverse" Charged Particle Density: dn/dηdφ RDF Preliminary ATLAS corrected data Tune DW generator level PTmax Direction φ 7 TeV Charged Particles ( η <2.5, PT>0.5 GeV/c) CMS preliminary data at and 7 TeV ATLAS preliminary data at and 7 on the transverse charged particle density, TeV on the transverse charged particle dn/dηdφ, as defined by the leading charged density, dn/dηdφ, as defined by the leading particle jet (chgjet#1) for charged particles charged particle (PTmax) for charged particles with p T > 0.5 GeV/c and η < 2. The data are with p T > 0.5 GeV/c and η < 2.5. The data are uncorrected and compared with PYTHIA corrected and compared with PYTHIA Tune Tune DW after detector simulation. DW at the generator level. PT(chgjet#1) Direction Charged Particles ( η <2.0, PT>0.5 GeV/c) φ 7 TeV CMS ATLAS Toward Toward Transverse Transverse Transverse Transverse Away Away Rick Field Florida/CDF/CMS Page 27

28 PYTHIA Tune DW Charged Particle Density "Transverse" Charged Particle Density: dn/dηdφ CMS Preliminary data uncorrected pydw + SIM Ratio PT(chgjet#1) GeV/c CMS preliminary data at and 7 TeV on the transverse charged particle density, dn/dηdφ, as defined by the leading charged particle jet (chgjet#1) for charged particles with p T > 0.5 GeV/c and η < 2. The data are uncorrected and compared with PYTHIA Tune DW after detector simulation. PT(chgjet#1) Direction Toward Charged Particles ( η <2.0, PT>0.5 GeV/c) φ 7 TeV CMS Ratio: 7 TeV/ "Transverse" Charged Particle Density: dn/dηdφ CMS Preliminary data uncorrected pydw + SIM 7 TeV / Charged Particles ( η <2.0, PT>0.5 GeV/c) PT(chgjet#1) (GeV/c) CMS Ratio of CMS preliminary data at and 7 TeV on the transverse charged particle density, dn/dηdφ, as defined by the leading charged particle jet (chgjet#1) for charged particles with p T > 0.5 GeV/c and η < 2. The data are uncorrected and compared with PYTHIA Tune DW after PT(chgjet#1) Direction detector simulation. Toward φ Transverse Transverse Transverse Transverse Away Away Rick Field Florida/CDF/CMS Page 28

29 PYTHIA Tune Z1 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)! 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. 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! PARP(90) Color Connections Underlying Event Outgoing Parton Final-State Radiation PARP(82) Diffraction Outgoing Parton PT(hard) UE&MB@CMS Initial-State Radiation Underlying Event Rick Field Florida/CDF/CMS Page 29

30 PYTHIA Tune Z1 Parameter Tune Z1 (R. Field CMS) Tune AMBT1 (ATLAS) Parameters not shown are the PYTHIA 6.4 defaults! Parton Distribution Function PARP(82) MPI Cut-off PARP(89) Reference energy, E0 CTEQ5L LO* PARP(90) MPI Energy Extrapolation PARP(77) CR Suppression PARP(78) CR Strength PARP(80) Probability colored parton from BBR PARP(83) Matter fraction in core PARP(84) Core of matter overlap PARP(62) ISR Cut-off PARP(93) primordial kt-max 1 1 MSTP(81) MPI, ISR, FSR, BBR model MSTP(82) Double gaussion matter distribution 4 4 MSTP(91) Gaussian primordial kt 1 1 MSTP(95) strategy for color reconnection 6 6 Rick Field Florida/CDF/CMS Page 30

31 CMS UE Data Charged Particle Density "Transverse" Charged Particle Density: dn/dηdφ CMS Preliminary data uncorrected Theory + SIM D6T PT(chgjet#1) GeV/c CMS preliminary data at and 7 TeV on the transverse charged particle density, dn/dηdφ, as defined by the leading charged particle jet (chgjet#1) for charged particles with p T > 0.5 GeV/c and η < 2.0. The data are uncorrected and compared with PYTHIA Tune DW and D6T after detector simulation (SIM). Color reconnection suppression. Color reconnection strength. DW 7 TeV CMS Tune Z1 (CTEQ5L) PARP(82) = PARP(90) = PARP(77) = 16 PARP(78) = Charged Particle Density "Transverse" Charged Particle Density: dn/dηdφ CMS Preliminary data uncorrected pyz1 + SIM Tune Z1 Charged Particles ( η <2.0, PT>0.5 GeV/c) PT(chgjet#1) GeV/c 7 TeV CMS CMS preliminary data at and 7 TeV on the transverse charged particle density, dn/dηdφ, as defined by the leading charged particle jet (chgjet#1) for charged particles with p T > 0.5 GeV/c and η < 2.0. The data are uncorrected and compared with PYTHIA Tune Z1 after detector simulation (SIM). Tune Z1 is a PYTHIA 6.4 using p T -ordered parton showers and the new MPI model! Rick Field Florida/CDF/CMS Page 31

32 PYTHIA 6.2 Tunes Parameter Tune AW Tune DW Tune D6 PDF CTEQ5L CTEQ5L CTEQ6L UE Parameters MSTP(81) MSTP(82) PARP(82) GeV GeV GeV Uses CTEQ6L PARP(83) PARP(84) PARP(85) 0.9 ISR Parameter PARP(86) PARP(89) PARP(90) PARP(62) TeV TeV TeV Reduce PARP(82) by factor of 1.8/1.9 = 0.95 Everything else the same! PARP(64) PARP(67) MSTP(91) PARP(91) Tune A energy dependence! (not the default) PARP(93) Intrinsic KT CMS: We wanted a CTEQ6L version of Tune Z1 in a hurry! Rick Field Florida/CDF/CMS Page 32

33 PYTHIA Tune Z2 My guess! Parameter Tune Z1 (R. Field CMS) Tune Z2 (R. Field CMS) Parton Distribution Function CTEQ5L CTEQ6L PARP(82) MPI Cut-off PARP(89) Reference energy, E PARP(90) MPI Energy Extrapolation PARP(77) CR Suppression PARP(78) CR Strength PARP(80) Probability colored parton from BBR Reduce PARP(82) by factor of 1.83/1.93 = 0.95 Everything else the same! PARP(83) Matter fraction in core PARP(84) Core of matter overlap PARP(62) ISR Cut-off PARP(93) primordial kt-max 1 1 MSTP(81) MPI, ISR, FSR, BBR model MSTP(82) Double gaussion matter distribution 4 4 MSTP(91) Gaussian primordial kt 1 1 MSTP(95) strategy for color reconnection 6 6 Rick Field Florida/CDF/CMS Page 33

34 PYTHIA Tune Z2 My guess! Parameter Tune Z1 (R. Field CMS) Tune Z2 (R. Field CMS) Parton Distribution Function CTEQ5L CTEQ6L PARP(82) MPI Cut-off PARP(89) Reference energy, E PARP(90) MPI Energy Extrapolation PARP(77) CR Suppression PARP(78) CR Strength PARP(80) Probability colored parton from BBR Reduce PARP(82) by factor of 1.83/1.93 = 0.95 Everything else the same! PARP(83) Matter fraction in core PARP(84) Core of matter overlap PARP(62) ISR Cut-off PARP(93) primordial kt-max PARP(90) same For Z1 and Z2! MSTP(81) MPI, ISR, FSR, BBR model MSTP(82) Double gaussion matter distribution 4 4 MSTP(91) Gaussian primordial kt 1 1 MSTP(95) strategy for color reconnection 6 6 Rick Field Florida/CDF/CMS Page 34

35 PYTHIA 6.4 Tune Z2 Charged Particle Density "Transverse" Charged Particle Density: dn/dηdφ CMS Preliminary data corrected Tune Z1 generator level PT(chgjet#1) GeV/c 7 TeV CMS Tune Z1 Charged Particles ( η <2.0, PT>0.5 GeV/c) CMS preliminary data at and 7 TeV on the transverse charged particle density, dn/dηdφ, as defined by the leading charged particle jet (chgjet#1) for charged particles with p T > 0.5 GeV/c and η < 2.0. The data are corrected and compared with PYTHIA Tune Z1 at the generator level. PTsum Density (GeV/c) "Transverse" Charged PTsum Density: dpt/dηdφ CMS Preliminary data corrected Tune Z1 generator level 7 TeV CMS Charged Particles ( η <2.0, PT>0.5 GeV/c) PT(chgjet#1) GeV/c Tune Z1 CMS preliminary data at and 7 TeV on the transverse charged PTsum density, dpt/dηdφ, as defined by the leading charged particle jet (chgjet#1) for charged particles with p T > 0.5 GeV/c and η < 2.0. The data are corrected and compared with PYTHIA Tune Z1 at the generator level. CMS corrected data! Very nice agreement! CMS corrected data! Rick Field Florida/CDF/CMS Page 35

36 PYTHIA 6.4 Tune Z2 Charged Particle Density "Transverse" Charged Particle Density: dn/dηdφ CMS Preliminary data corrected Tune Z2 generator level 7 TeV Tune Z2 Charged Particles ( η <2.0, PT>0.5 GeV/c) PTsum Density (GeV/c) "Transverse" Charged PTsum Density: dpt/dηdφ CMS Preliminary data corrected Tune Z2 generator level 7 TeV Tune Z2 Charged Particles ( η <2.0, PT>0.5 GeV/c) PT(chgjet#1) GeV/c PT(chgjet#1) GeV/c CMS preliminary data at and 7 TeV on the transverse charged particle density, dn/dηdφ, as defined by the leading charged particle jet (chgjet#1) for charged particles with p T > 0.5 GeV/c and η < 2.0. The data are corrected and compared with PYTHIA Tune Z2 at the generator level. CMS preliminary data at and 7 TeV on the transverse charged PTsum density, dpt/dηdφ, as defined by the leading charged particle jet (chgjet#1) for charged particles with p T > 0.5 GeV/c and η < 2.0. The data are corrected and compared with PYTHIA Tune Z2 at the generator level. CMS corrected data! Not good! Bad energy dependence! CMS corrected data! Rick Field Florida/CDF/CMS Page 36

37 PYTHIA Tune Z2* PARP(82) MPI Cut-off Parameter Parton Distribution Function PARP(89) Reference energy, E0 PARP(90) MPI Energy Extrapolation PARP(77) CR Suppression PARP(78) CR Strength A. Knutsson & M. Zakaria PARP(80) Probability colored parton from using BBR Rivet & the Professor 0.1 PARP(83) Matter fraction in core Tune Z1 (R. Field CMS) CTEQ5L Tune Z2 (R. Field CMS) CTEQ6L Tune Z2* (CMS) CTEQ6L PARP(84) Core of matter overlap PARP(62) ISR Cut-off PARP(93) primordial kt-max MSTP(81) MPI, ISR, FSR, BBR model MSTP(82) Double gaussion matter distribution MSTP(91) Gaussian primordial kt MSTP(95) strategy for color reconnection Rick Field Florida/CDF/CMS Page 37

38 MB&UE Working Group MB & UE Common Plots CMS 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. ATLAS Outgoing Parton PT(hard) Minimum Bias Collisions Initial-State Radiation Underlying Event Underlying Event Outgoing Parton Final-State Radiation Rick Field Florida/CDF/CMS Page 38

39 MB Common Plots 7 TeV Direct charged particles (including leptons) corrected to the particle level with no corrections for SD or DD. Rick Field Florida/CDF/CMS Page 39

40 CMS Common Plots Observable MB1: dn chg /dη N chg 1 η < 0.8 p T > 0.5 Gev/c & GeV/c MB2: dn chg /dp T N chg 1 η < 0.8 MB3: Multiplicity Distribution η < 0.8 p T > 0.5 GeV/c & GeV/c MB4: <p T > versus Nchg η < 0.8 p T > 0.5 GeV/c & GeV/c UE1: Transverse Nchg & PTsum as defined by the leading charged particle, PTmax η < 0.8 p T > 0.5 GeV/c & GeV/c Done QCD Stalled Stalled In progress (Antwerp) Done FSQ TeV Done QCD Stalled Stalled In progress (Antwerp) Done FSQ Direct charged particles (including leptons) corrected to the particle level with no corrections for SD or DD. Rick Field Florida/CDF/CMS Page 40

41 CMS Common Plots Observable MB1: dn chg /dη N chg 1 η < 0.8 p T > 0.5 Gev/c & GeV/c Done QCD TeV Done QCD MB2: dn chg /dp T N chg 1 η < 0.8 MB3: Multiplicity Distribution η < 0.8 p T > 0.5 GeV/c & GeV/c MB4: <p T > versus Nchg η < 0.8 p T > 0.5 GeV/c & GeV/c UE1: Transverse Nchg & PTsum as defined by the leading charged particle, PTmax η < 0.8 p T > 0.5 GeV/c & GeV/c Stalled Note that all the common plots require at least one charged Stalled particle with p T > 0.5 GeV/c and η < 0.8! In progress This done so that the plots are (Antwerp) less sensitive to SD and DD. Done FSQ Direct charged particles (including leptons) corrected to the particle level with no corrections for SD or DD. Stalled Stalled In progress (Antwerp) Done FSQ Rick Field Florida/CDF/CMS Page 41

42 Tevatron Energy Scan 1 mile CDF Anti 1.96 TeV Anti Just before the shutdown of the Tevatron CDF has collected more than 10M min-bias events at several center-of-mass energies! 300 GeV 12.1M MB Events 54.3M MB Events Rick Field Florida/CDF/CMS Page 42

43 Tevatron Energy Scan 1 mile CDF Anti Special thanks to Mike Albrow, Michelangelo Mangano, Rob Roser, TeV and everyone that helped make this happen! Anti Just before the shutdown of the Tevatron CDF has collected more than 10M min-bias events at several center-of-mass energies! 300 GeV 12.1M MB Events 54.3M MB Events Rick Field Florida/CDF/CMS Page 43

44 CDF Common Plots Observable 300 GeV 1.96 TeV MB1: dn chg /dη N chg 1 η < 0.8 p T > 0.5 Gev/c & GeV/c Done Done Done MB2: dn chg /dp T N chg 1 η < 0.8 In progress In progress In progress MB3: Multiplicity Distribution η < 0.8 p T > 0.5 GeV/c & GeV/c In progress In progress In progress MB4: <p T > versus Nchg η < 0.8 p T > 0.5 GeV/c & GeV/c In progress In progress In progress UE1: Transverse Nchg & PTsum as defined by the leading charged particle, PTmax η < 0.8 p T > 0.5 GeV/c & GeV/c p T > 0.5 GeV/c Done p T > 0.5 GeV/c Done p T > 0.5 GeV/c Done Direct charged particles (including leptons) corrected to the particle level with no corrections for SD or DD. R. Field, C. Group, and D. Wilson. Rick Field Florida/CDF/CMS Page 44

45 CDF Common Plots Observable 300 GeV 1.96 TeV MB1: dn chg /dη N chg 1 η < 0.8 p T > 0.5 Gev/c & GeV/c Done Done Done MB2: dn chg /dp T N chg 1 η < 0.8 MB3: Multiplicity Distribution η < 0.8 p T > 0.5 GeV/c & GeV/c MB4: <p T > versus Nchg η < 0.8 p T > 0.5 GeV/c & GeV/c UE1: Transverse Nchg & PTsum as defined by the leading charged particle, PTmax η < 0.8 p T > 0.5 GeV/c & GeV/c In progress In progress p T > 0.5 GeV/c Done In progress Special thanks In to progress Mary Convery, In progress Ray Culbertson, and Jonathan Lewis for their help with the datasets! In progress p T > 0.5 GeV/c Done Direct charged particles (including leptons) corrected to the particle level with no corrections for SD or DD. In progress In progress In progress p T > 0.5 GeV/c Done R. Field, C. Group, and D. Wilson. Rick Field Florida/CDF/CMS Page 45

46 MB Common Plots Direct charged particles (including leptons) corrected to the particle level with no corrections for SD or DD. Rick Field Florida/CDF/CMS Page 46

47 MB Common Plots Average Number RDF Preliminary CMS Pseudo-Rapidity Distribution: dn/dη ATLAS CDF ALICE Pseudo-Rapidity At least 1 charged particle Average Number RDF Preliminary CMS Pseudo-Rapidity Distribution: dn/dη ALICE CDF ATLAS At least 1 charged particle Charged Particles ( η <0.8, PT> GeV/c) Pseudo-Rapidity Direct charged particles (including leptons) corrected to the particle level with no corrections for SD or DD. Rick Field Florida/CDF/CMS Page 47

48 New CDF MB Data Pseudo-Rapidity Distribution: dn/dη TeV Average Number GeV At least 1 charged particle Pseudo-Rapidity New Corrected CDF data at 300 GeV,, and 1.96 TeV on on pseudo-rapidity distribution of charged particles, dn/dη, with p T > 0.5 GeV/c. Events are required to have at least one charged particle with η < 0.8 and p T > 0.5 GeV/c. The data are corrected to the particle level with errors that include both the statistical error and the systematic uncertainty. Rick Field Florida/CDF/CMS Page 48

49 New CDF MB Data Average Number RDF Pseudo-Rapidity Distribution: dn/dη 300 GeV 1.96 TeV CDF At least 1 charged particle CMS Pseudo-Rapidity New Corrected CDF data at 300 GeV,, and 1.96 TeV on on pseudo-rapidity distribution of charged particles, dn/dη, with p T > 0.5 GeV/c. Events are required to have at least one charged particle with η < 0.8 and p T > 0.5 GeV/c. The data are corrected to the particle level with errors that include both the statistical error and the systematic uncertainty. Rick Field Florida/CDF/CMS Page 49

50 Average Number New CDF MB Data RDF RDF Corrected Data CDF 2.0 CDF 2 CDF GeV 300 GeV CMS Pseudo-Rapidity Distribution: dn/dη 1.96 TeV Tune Z TeV CDF Pseudo-Rapidity 7 TeV At least 1 charged particle CMS New Corrected CDF data at 300 GeV,, and 1.96 TeV on on pseudo-rapidity distribution of charged particles, dn/dη, with p T > 0.5 GeV/c. Events are required to have at least one charged particle with η < 0.8 and p T > 0.5 GeV/c. The data are corrected to the particle level with errors that include both the statistical error and the systematic uncertainty. Rick Field Florida/CDF/CMS Page 50

51 New CDF MB Data Pseudo-Rapidity Distribution: dn/dη TeV Average Number 300 GeV At least 1 charged particle Charged Particles ( η <0.8, PT> GeV/c) Pseudo-Rapidity New Corrected CDF data at 300 GeV,, and 1.96 TeV on on pseudo-rapidity distribution of charged particles, dn/dη, with p T > GeV/c. Events are required to have at least one charged particle with η < 0.8 and p T > GeV/c. The data are corrected to the particle level with errors that include both the statistical error and the systematic uncertainty. Rick Field Florida/CDF/CMS Page 51

52 New CDF MB Data Average Number Pseudo-Rapidity Distribution: dn/dη RDF CDF 1.96 TeV 1.1 CMS GeV At least At 1 least charged 1 charged particle particle Charged Charged Particles Particles ( η <0.8, ( η <0.8, PT> PT> GeV/c) GeV/c) Pseudo-Rapidity New Corrected CDF data at 300 GeV,, and 1.96 TeV on on pseudo-rapidity distribution of charged particles, dn/dη, with p T > GeV/c. Events are required to have at least one charged particle with η < 0.8 and p T > GeV/c. The data are corrected to the particle level with errors that include both the statistical error and the systematic uncertainty. Rick Field Florida/CDF/CMS Page 52

53 Average Number New CDF MB Data RDF Preliminary CDF CDF Corrected Corrected Data Data Pseudo-Rapidity Distribution: dn/dη 1.96 TeV CMS CDF 1.96 TeV 0.9 CDF 300 GeV At least At 1 least 1 charged 300 GeV At least 1 charged particle particle Tune Z1 Charged Charged Particles Particles ( η <0.8, ( η <0.8, PT> PT> GeV/c) GeV/c) Pseudo-Rapidity New Corrected CDF data at 300 GeV,, and 1.96 TeV on on pseudo-rapidity distribution of charged particles, dn/dη, with p T > GeV/c. Events are required to have at least one charged particle with η < 0.8 and p T > GeV/c. The data are corrected to the particle level with errors that include both the statistical error and the systematic uncertainty. 7 TeV CMS Rick Field Florida/CDF/CMS Page 53

54 Energy Dependence dn/d /dη Pseudo-Rapidity Distribution: dn/dη(η=0) RDF Preliminary CDF black dots CMS red squares Average Number Center-of-Mass Energy (GeV) At least 1 charged particle CMS data at 7 TeV and and CDF data at 1.96 TeV,, and 300 GeV on dn/dη at η = 0 with p T > 0.5 GeV/c as a function of the center-of-mass energy. Events are required to have at least one charged particle with η < 0.8 and p T > 0.5 GeV/c. The data are corrected to the particle level with errors that include both the statistical error and the systematic uncertainty. Rick Field Florida/CDF/CMS Page 54

55 Average Number Energy Dependence dn/d /dη Pseudo-Rapidity Distribution: dn/dη(η=0) RDF Preliminary Tune Z1 CDF black dots CMS red squares Center-of-Mass Energy (GeV) At least 1 charged particle CMS data at 7 TeV and and CDF data at 1.96 TeV,, and 300 GeV on dn/dη at η = 0 with p T > 0.5 GeV/c as a function of the center-of-mass energy. Events are required to have at least one charged particle with η < 0.8 and p T > 0.5 GeV/c. The data are corrected to the particle level with errors that include both the statistical error and the systematic uncertainty. Rick Field Florida/CDF/CMS Page 55

56 Energy Dependence dn/d /dη Average Number Pseudo-Rapidity Distribution: dn/dη(η=0) RDF Preliminary Tune Z1 CDF black dots CMS red squares Center-of-Mass Energy (GeV) At least 1 charged particle Charged Particles ( η <0.8, PT> GeV/c) CMS data at 7 TeV and and CDF data at 1.96 TeV,, and 300 GeV on dn/dη at η = 0 with p T > GeV/c as a function of the center-of-mass energy. Events are required to have at least one charged particle with η < 0.8 and p T > GeV/c. The data are corrected to the particle level with errors that include both the statistical error and the systematic uncertainty. Rick Field Florida/CDF/CMS Page 56

57 Overall Charged Particle Density Pseudo-Rapidity Distribution: dn/dη Overall Charged Particle Density TeV 0.50 RDF Preliminary CMS red squares CDF blue dots Average Number GeV Charged Density At least 1 charged particle Pseudo-Rapidity At least 1 charged particle Center-of-Mass Energy (TeV) Corrected CDF data on the pseudo-rapidity Corrected CDF and CMS data overall density of distribution, dn/dη, for charged with p T > 0.5 charged particles with p T > 0.5 GeV/c and η < GeV/c and η < 0.8 for events with at least one 0.8 for events with at least one charged particle charged particle with p T > 0.5 GeV/c and η < with p T > 0.5 GeV/c and η < 0.8 plotted versus 0.8. the center-of-mass energy (log scale). The data are corrected to the particle level with errors Ecm Nchg error NchgDen error that include both the statistical error and the 300 GeV systematic uncertainty TeV N chg = dn dη dη Rick Field Florida/CDF/CMS Page 57

58 New UE Observables transmax and transmin Charged Particle Density: Number of charged particles (p T > 0.5 GeV/c, η < 0.8) in the the maximum (minimum) of the two transverse regions as defined by the leading charged particle, PTmax, divided by the area in η-φ space, 2η cut 2π/6, averaged over all events with at least one particle with p T > 0.5 GeV/c, η < η cut. PTmax Direction φ Toward TransMAX TransMIN transmax and transmin Charged PTsum Density: Scalar p T sum of charged particles (p T > 0.5 GeV/c, η < 0.8) in the the maximum (minimum) of the two transverse regions as defined by the leading charged particle, PTmax, divided by the area in η-φ space, 2η cut 2π/6, averaged over all events with at least one particle with p T > 0.5 GeV/c, η < η cut. Away Note: The overall transverse density is equal to the average of the transmax and TransMIN densities. The TransDIF Density is the transmax Density minus the transmin Density Transverse Density = transave Density = ( transmax Density + transmin Density)/2 TransDIF Density = transmax Density - transmin Density η cut = 0.8 Rick Field Florida/CDF/CMS Page 58

59 transmin & transdif The toward region contains the leading jet, while the away region, on the average, contains the away-side jet. The transverse region is perpendicular to the plane of the hard 2-to-2 scattering and is very sensitive to the underlying event. For events with large initial or final-state radiation the transmax region defined contains the third jet while both the transmax and transmin regions receive contributions from the MPI and beam-beam remnants. Thus, the transmin region is very sensitive to the multiple parton interactions (MPI) and beam-beam remnants (BBR), while the transmax minus the transmin (i.e. transdif ) is very sensitive to initial-state radiation (ISR) and final-state radiation (FSR). Jet #3 PTmax Direction TransMAX Toward Away Toward-Side Jet φ TransMIN TransMIN density more sensitive to MPI & BBR. Away-Side Jet TransDIF density more sensitive to ISR & FSR. 0 TransDIF 2 TransAVE TransDIF = TransAVE if TransMIX = 3 TransMIN Rick Field Florida/CDF/CMS Page 59

60 PTmax UE Data CDF PTmax UE Analysis: transmax, transmin, transave, and transdif charged particle and PTsum densities (p T > 0.5 GeV/c, η < 0.8) in proton-antiproton collisions at 300 GeV,, and 1.96 TeV (R. Field analysis). CMS PTmax UE Analysis: transmax, transmin, transave, and transdif charged particle and PTsum densities (p T > 0.5 GeV/c, η < 0.8) in proton-proton collisions at and 7 TeV (M. Zakaria analysis). The transmax, transmin, and transdif are not yet approved so I can only show transave which is approved. PTmax Direction φ Toward TransMAX TransMIN Away CMS UE Tunes: PYTHIA 6.4 Tune Z1 (CTEQ5L) and PYTHIA 6.4 Tune Z2* (CTEQ6L). Both were tuned to the CMS leading chgjet transave UE data at and 7 TeV. PYTHIA 8: Some comparisons with PYTHIA 8 Tune 4C (CTEQ6L), Richard Corke and Torbjörn Sjöstrand, JHEP 1103:032 (2011), arxiv: Rick Field Florida/CDF/CMS Page 60

61 UE Common Plots "Transverse" Charged Density "Transverse" Charged Particle Density: dn/dηdφ RDF Preliminary corrected data ATLAS (solid blue) ALICE (open black) 7 TeV Charged Particles ( η < 0.8, PT > 0.5 GeV/c) PTsum Density (GeV/c) "Transverse" Charged PTsum Density: dpt/dηdφ RDF Preliminary corrected data ATLAS (solid blue) ALICE (open black) 7 TeV Charged Particles ( η < 0.8, PT > 0.5 GeV/c) "Transverse" Charged Density "Transverse" Charged Particle Density: dn/dηdφ RDF Preliminary corrected data ATLAS (solid blue) ALICE (open black) Charged Particles ( η < 0.8, PT > 0.5 GeV/c) PTsum Density (GeV/c) "Transverse" Charged PTsum Density: dpt/dηdφ RDF Preliminary corrected data ATLAS (solid blue) ALICE (open black) Charged Particles ( η < 0.8, PT > 0.5 GeV/c) Rick Field Florida/CDF/CMS Page 61

62 UE Common Plots "Transverse" Charged Density "Transverse" Charged Density Density "Transverse" Charged Particle Density: dn/dηdφ RDF RDF Preliminary corrected corrected data data CMS (solid red) TeV ATLAS (solid blue) 7 TeV ATLAS (solid blue) ALICE ALICE (open (open black) black) Charged Charged Particles Particles ( η ( η < < 0.8, 0.8, PT PT > > GeV/c) GeV/c) PTmax PTmax (GeV/c) (GeV/c) "Transverse" Charged Particle Density: dn/dηdφ "Transverse" Charged Particle Density: dn/dηdφ RDF Preliminary RDF Preliminary corrected data corrected data CMS (solid red) ATLAS (solid blue) ATLAS (solid blue) ALICE (open black) Charged Particles ( η < 0.8, PT > 0.5 GeV/c) ALICE (open black) Charged Particles ( η < 0.8, PT > 0.5 GeV/c) PTsum Density (GeV/c) PTsum Density (GeV/c) PTsum Density (GeV/c) PTsum Density (GeV/c) "Transverse" Charged PTsum Density: dpt/dηdφ RDF RDF Preliminary corrected data data TeV TeV CMS (solid red) ATLAS (solid (solid blue) blue) ALICE (open black) Charged Particles ( η ( η < 0.8, < 0.8, PT PT > 0.5 > 0.5 ALICE (open black) GeV/c) "Transverse" Charged PTsum Density: dpt/dηdφ RDF RDF Preliminary corrected corrected data data CMS (solid red) ATLAS (solid blue) ATLAS (solid blue) ALICE Charged Particles ( η < 0.8, PT > 0.5 GeV/c) ALICE (open (open black) black) Charged Particles ( η < 0.8, PT > 0.5 GeV/c) PTmax (GeV/c) Rick Field Florida/CDF/CMS Page 62

63 UE Common Plots "Transverse" Charged Density "Transverse" Charged Density "Transverse" Charged Particle Density: dn/dηdφ 1.5 RDF Preliminary corrected data data Tune Z1 generator level 0.5 CMS (solid red) 7 TeV ATLAS (solid blue) ALICE (open black) Charged Particles ( η < 0.8, PT PT > GeV/c) "Transverse" Charged Particle Density: dn/dηdφ RDF RDF Preliminary corrected data corrected data Tune Z1 generator level CMS (solid red) red) ATLAS (solid blue) ( η 0.8, PT 0.5 ALICE (open black) Charged Particles ( η ( η < 0.8, 0.8, PT PT > GeV/c) PTsum Density (GeV/c) PTsum Density (GeV/c) PTsum Density (GeV/c) "Transverse" Charged PTsum Density: dpt/dηdφ RDF RDF Preliminary corrected data data Tune Z1 generator level TeV CMS (solid red) ATLAS (solid blue) ( η < 0.8, PT > 0.5 ALICE (open black) Charged Particles ( η < 0.8, PT > 0.5 GeV/c) "Transverse" Charged PTsum Density: dpt/dηdφ 0.8 RDF RDF Preliminary corrected data data Tune Z1 generator level CMS (solid red) ATLAS (solid blue) ( η PT 0.5 ALICE (open black) Charged Particles ( η < 0.8, PT > 0.5 GeV/c) Rick Field Florida/CDF/CMS Page 63