MonteCarlo Generators for CMS CDF Run 2 CMS
- Slides: 21
Monte-Carlo Generators for CMS CDF Run 2 CMS Outline of Talk Not favored at present! Æ Review briefly the CDF Run 1 and Run 2 PYTHIA 6. 2 tunes. Æ Discuss four NLO structure function CTEQ 6. 1 M PYTHIA 6. 2 tunes, Tune QK and Tune QKT, Tune QW and Tune QWT. UE&MB@CMS Perugia, Florida, Hamburg, Trieste Æ Introduce a new CTEQ 6 L tune Tune D 6 and Tune D 6 T. Æ Discuss a few early measurements at CMS. FNAL-CMS MC Generator Meeting June 7, 2007 Rick Field – Florida/CMS New CTEQ 6 L tune! 1
CDF Run 1 PYTHIA Tune A PYTHIA 6. 206 CTEQ 5 L Parameter Tune B Tune A MSTP(81) 1 1 MSTP(82) 4 4 PARP(82) 1. 9 Ge. V 2. 0 Ge. V PARP(83) 0. 5 PARP(84) 0. 4 PARP(85) 1. 0 0. 9 PARP(86) 1. 0 0. 95 PARP(89) 1. 8 Te. V PARP(90) 0. 25 PARP(67) 1. 0 4. 0 New PYTHIA default (less initial-state radiation) FNAL-CMS MC Generator Meeting June 7, 2007 CDF Default! Run 1 Analysis Æ Plot shows the “transverse” charged particle density versus PT(chgjet#1) compared to the QCD hard scattering predictions of two tuned versions of PYTHIA 6. 206 (CTEQ 5 L, Set B (PARP(67)=1) and Set A (PARP(67)=4)). Old PYTHIA default (more initial-state radiation) Rick Field – Florida/CMS 2
CDF Run 1 PT(Z) UE Parameters PYTHIA 6. 2 CTEQ 5 L Parameter Tune A 25 Tune A 50 MSTP(81) 1 1 1 MSTP(82) 4 4 4 PARP(82) 2. 0 Ge. V PARP(83) 0. 5 PARP(84) 0. 4 PARP(85) 0. 9 PARP(86) 0. 95 1. 8 Te. V PARP(90) 0. 25 PARP(67) 4. 0 MSTP(91) 1 1 1 PARP(91) 1. 0 2. 5 5. 0 PARP(93) 5. 0 15. 0 25. 0 ISR Parameter PARP(89) Æ Shows the Run 1 Z-boson p. T distribution (<p. T(Z)> ≈ 11. 5 Ge. V/c) compared with PYTHIA Tune A (<p. T(Z)> = 9. 7 Ge. V/c), Tune A 25 (<p. T(Z)> = 10. 1 Ge. V/c), and Tune A 50 (<p. T(Z)> = 11. 2 Ge. V/c). Vary the intrensic KT! Intrensic KT FNAL-CMS MC Generator Meeting June 7, 2007 Rick Field – Florida/CMS 3
CDF Run 1 PT(Z) PYTHIA 6. 2 CTEQ 5 L Parameter Tune AW UE Parameters MSTP(81) 1 1 MSTP(82) 4 4 PARP(82) 2. 0 Ge. V PARP(83) 0. 5 PARP(84) 0. 4 PARP(85) 0. 9 PARP(86) 0. 95 PARP(89) 1. 8 Te. V PARP(90) 0. 25 PARP(62) 1. 0 1. 25 PARP(64) 1. 0 0. 2 PARP(67) 4. 0 MSTP(91) 1 1 PARP(91) 1. 0 2. 1 PARP(93) 5. 0 15. 0 ISR Parameters Tune used by the CDF-EWK group! Æ Shows the Run 1 Z-boson p. T distribution (<p. T(Z)> ≈ 11. 5 Ge. V/c) compared with PYTHIA Tune A (<p. T(Z)> = 9. 7 Ge. V/c), and PYTHIA Tune AW (<p. T(Z)> = 11. 7 Ge. V/c). Effective Q cut-off, below which space-like showers are not evolved. Intrensic KT The Q 2 = k. T 2 in as for space-like showers is scaled by PARP(64)! FNAL-CMS MC Generator Meeting June 7, 2007 Rick Field – Florida/CMS 4
CDF Run 1 PT(Z) PYTHIA 6. 2 CTEQ 5 L Parameter Tune AW UE Parameters MSTP(81) 1 1 MSTP(82) 4 4 PARP(82) 2. 0 Ge. V PARP(83) 0. 5 PARP(84) 0. 4 PARP(85) 0. 9 PARP(86) 0. 95 PARP(89) 1. 8 Te. V PARP(90) 0. 25 PARP(62) 1. 0 1. 25 PARP(64) 1. 0 0. 2 PARP(67) 4. 0 MSTP(91) 1 1 PARP(91) 1. 0 2. 1 PARP(93) 5. 0 15. 0 ISR Parameters Tune used by the CDF-EWK group! Also fits the high p. T tail! Æ Shows the Run 1 Z-boson p. T distribution (<p. T(Z)> ≈ 11. 5 Ge. V/c) compared with PYTHIA Tune A (<p. T(Z)> = 9. 7 Ge. V/c), and PYTHIA Tune AW (<p. T(Z)> = 11. 7 Ge. V/c). Effective Q cut-off, below which space-like showers are not evolved. Intrensic KT The Q 2 = k. T 2 in as for space-like showers is scaled by PARP(64)! FNAL-CMS MC Generator Meeting June 7, 2007 Rick Field – Florida/CMS 5
Jet-Jet Correlations (DØ) Jet#1 -Jet#2 Df Distribution Df Jet#1 -Jet#2 Æ Mid. Point Cone Algorithm (R = 0. 7, fmerge = 0. 5) Æ L = 150 pb-1 (Phys. Rev. Lett. 94 221801 (2005)) Æ Data/NLO agreement good. Data/HERWIG agreement good. Æ Data/PYTHIA agreement good provided PARP(67) = 1. 0→ 4. 0 (i. e. like Tune A, best fit 2. 5). FNAL-CMS MC Generator Meeting June 7, 2007 Rick Field – Florida/CMS 6
CDF Run 1 PT(Z) PYTHIA 6. 2 CTEQ 5 L Parameter Tune DW Tune AW UE Parameters MSTP(81) 1 1 MSTP(82) 4 4 PARP(82) 1. 9 Ge. V 2. 0 Ge. V PARP(83) 0. 5 PARP(84) 0. 4 PARP(85) 1. 0 0. 9 PARP(86) 1. 0 0. 95 PARP(89) 1. 8 Te. V PARP(90) 0. 25 PARP(62) 1. 25 PARP(64) 0. 2 PARP(67) 2. 5 4. 0 MSTP(91) 1 1 PARP(91) 2. 1 PARP(93) 15. 0 ISR Parameters Æ Shows the Run 1 Z-boson p. T distribution (<p. T(Z)> ≈ 11. 5 Ge. V/c) compared with PYTHIA Tune DW, and HERWIG. Tune DW uses D 0’s perfered value of PARP(67)! Intrensic KT Tune DW has a lower value of PARP(67) and slightly more MPI! FNAL-CMS MC Generator Meeting June 7, 2007 Rick Field – Florida/CMS 7
“Transverse” Nchg Density UE Parameters PYTHIA 6. 2 CTEQ 5 L Parameter Tune AW Tune DW Tune BW MSTP(81) 1 1 1 MSTP(82) 4 4 4 PARP(82) 2. 0 Ge. V 1. 9 Ge. V 1. 8 Ge. V PARP(83) 0. 5 PARP(84) 0. 4 PARP(85) 0. 9 1. 0 PARP(86) 0. 95 1. 0 1. 8 Te. V PARP(90) 0. 25 PARP(62) 1. 25 PARP(64) 0. 2 PARP(67) 4. 0 2. 5 1. 0 MSTP(91) 1 1 1 PARP(91) 2. 5 2/5 PARP(93) 15. 0 ISR Parameter PARP(89) Intrensic KT Three different amounts of MPI! Æ Shows the “transverse” charged particle density, d. N/dhdf, versus PT(jet#1) for “leading jet” events at 1. 96 Te. V for PYTHIA Tune A, Tune AW, Tune DW, Tune BW, and HERWIG (without MPI). Three different amounts of ISR! FNAL-CMS MC Generator Meeting June 7, 2007 Rick Field – Florida/CMS 8
New PYTHIA 6. 2 Tunes Use LO as with L = 192 Me. V! UE Parameters ISR Parameter Tune DW Tune D 6 Tune QW Tune QK PDF CTEQ 5 L CTEQ 6. 1 MSTP(2) 1 1 MSTP(33) 0 0 0 1 PARP(31) 1. 0 1. 8 MSTP(81) 1 1 MSTP(82) 4 4 PARP(82) 1. 9 Ge. V 1. 8 Ge. V 1. 1 Ge. V 1. 9 Ge. V PARP(83) 0. 5 PARP(84) 0. 4 PARP(85) 1. 0 PARP(86) 1. 0 PARP(89) 1. 8 Te. V PARP(90) 0. 25 PARP(62) 1. 25 PARP(64) 0. 2 PARP(67) 2. 5 MSTP(91) 1 1 PARP(91) 2. 1 PARP(93) 15. 0 NLO Structure Function! K-factor (T. Sjostrand) Tune A energy dependence! Intrinsic KT FNAL-CMS MC Generator Meeting June 7, 2007 Rick Field – Florida/CMS 9
New PYTHIA 6. 2 Tunes Use LO as with L = 192 Me. V! UE Parameters ISR Parameter Tune DWT ATLAS Tune D 6 T Tune QWT Tune QKT PDF CTEQ 5 L CTEQ 6 L CTEQ 6. 1 MSTP(2) 1 1 1 MSTP(33) 0 0 1 1 1 PARP(31) 1. 0 1. 8 MSTP(81) 1 1 1 MSTP(82) 4 4 4 PARP(82) 1. 9409 Ge. V 1. 8387 Ge. V 1. 1237 Ge. V 1. 9409 Ge. V PARP(83) 0. 5 0. 5 PARP(84) 0. 4 0. 5 0. 4 PARP(85) 1. 0 0. 33 1. 0 PARP(86) 1. 0 0. 66 1. 0 PARP(89) 1. 96 Te. V 1. 0 Te. V 1. 96 Te. V PARP(90) 0. 16 PARP(62) 1. 25 1. 0 1. 25 PARP(64) 0. 2 1. 0 0. 2 PARP(67) 2. 5 1. 0 2. 5 MSTP(91) 1 1 1 PARP(91) 2. 1 1. 0 2. 1 PARP(93) 15. 0 NLO Structure Function! K-factor (T. Sjostrand) ATLAS energy dependence! Intrinsic KT FNAL-CMS MC Generator Meeting June 7, 2007 Rick Field – Florida/CMS 10
New PYTHIA 6. 2 Tunes 1. 96 Te. V 14 Te. V PT 0(MPI) Ge. V s(MPI) mb Tune DW 1. 9409 351. 7 3. 1730 549. 2 Tune DWT 1. 9409 351. 7 2. 6091 829. 1 ATLAS 2. 0046 324. 5 2. 7457 768. 0 Tune D 6 1. 8387 306. 3 3. 0059 546. 1 Tune D 6 T 1. 8387 306. 3 2. 5184 786. 5 Tune QK 1. 9409 259. 5 3. 1730 422. 0 Tune QKT 1. 9409 259. 5 2. 6091 588. 0 Æ Average charged particle density and PTsum density in the “transverse” region (p. T > 0. 5 Ge. V/c, |h| < 1) versus PT(jet#1) at 1. 96 Te. V for PY Tune DW, Tune D 6, and Tune QK. FNAL-CMS MC Generator Meeting June 7, 2007 Rick Field – Florida/CMS 11
New PYTHIA 6. 2 Tunes 1. 96 Te. V 14 Te. V PT 0(MPI) Ge. V s(MPI) mb Tune DW 1. 9409 351. 7 3. 1730 549. 2 Tune DWT 1. 9409 351. 7 2. 6091 829. 1 ATLAS 2. 0046 324. 5 2. 7457 768. 0 Tune D 6 1. 8387 306. 3 3. 0059 546. 1 Tune D 6 T 1. 8387 306. 3 2. 5184 786. 5 Tune QK 1. 9409 259. 5 3. 1730 422. 0 Tune QKT 1. 9409 259. 5 2. 6091 588. 0 Æ Average charged particle density and PTsum density in the “transverse” region (p. T > 0. 5 Ge. V/c, |h| < 1) versus PT(jet#1) at 14 Te. V for PY Tune DWT, Tune D 6 T, and Tune QKT. FNAL-CMS MC Generator Meeting June 7, 2007 Rick Field – Florida/CMS 12
PYTHIA 6. 2 Tunes LHC Min-Bias Predictions Æ Shows the predictions of PYTHIA Tune A, Tune DWT, and the ATLAS tune for the charged particle density d. N/dh and d. N/d. Y at 14 Te. V (all p. T). Æ PYTHIA Tune A and Tune DW predict about 6 charged particles per unit h at h = 0, while the ATLAS tune predicts around 9. Æ PYTHIA Tune DWT is identical to Tune DW at 1. 96 Te. V, but extrapolates to the LHC using the ATLAS energy dependence. FNAL-CMS MC Generator Meeting June 7, 2007 Rick Field – Florida/CMS 13
PYTHIA 6. 2 Tunes LHC Min-Bias Predictions Æ Shows the predictions of PYTHIA Tune A, Tune DWT, and the ATLAS tune for the charged particle p. T distribution at 14 Te. V (|h| < 1) and the average number of charged particles with p. T > p. Tmin (|h| < 1). Æ The ATLAS tune has many more “soft” particles than does any of the CDF Tunes. The ATLAS tune has <p. T> = 548 Me. V/c while Tune A has <p. T> = 641 Me. V/c (100 Me. V/c more per particle)! FNAL-CMS MC Generator Meeting June 7, 2007 Rick Field – Florida/CMS 14
New PYTHIA 6. 2 Tunes 14 Te. V (p. T > 0. 5 Ge. V/c, |h| < 1) <Nchg> <PTsum> (Ge. V/c) <PT> (Ge. V/c) Tune DWT 6. 268 7. 091 1. 131 Tune D 6 T 5. 743 6. 467 1. 126 Tune QKT 5. 361 6. 115 0. 982 Numbers for p. T > 0. 5 Ge. V/c, |h| < 1. Æ Pseudo. Rapidity distribution, d. N/dh, for charged particles with p. T > 0. 5 Ge. V/c at 14 Te. V for PY Tune DWT, Tune D 6 T, and Tune QKT. Note this is “hard core” (i. e. MSEL=1, PT(hard) = 0) with no trigger and with only stable particles (i. e. MSTJ(22)=1). Tune D 6 T uses CTEQ 6 L (i. e. LHAPDF = 10042) and Tune QKT uses CTEQ 6. 1 M (i. e. LHAPDF = 10100 or 10150 which are the same). FNAL-CMS MC Generator Meeting June 7, 2007 Rick Field – Florida/CMS We now have CTEQ 6 L Tune D 6 T! 15
The Evolution of Charged Jets and the “Underlying Event” “Transverse” region very sensitive to the “underlying event”! Charged Particle Df Correlations PT > 0. 5 Ge. V/c |h| < 1 Look at the charged particle density in the “transverse” region! CDF Run 1 Analysis Æ Look at charged particle correlations in the azimuthal angle Df relative to the leading charged Æ Æ particle jet. Define |Df| < 60 o as “Toward”, 60 o < |Df| < 120 o as “Transverse”, and |Df| > 120 o as “Away”. All three regions have the same size in h-f space, Dhx. Df = 2 x 120 o = 4 p/3. FNAL-CMS MC Generator Meeting June 7, 2007 Rick Field – Florida/CMS 16
CDF Run 2 Min-Bias “Associated” Charged Particle Density “Associated” densities do not include PTmax! Highest p. T charged particle! Æ Use the maximum p. T charged particle in the event, PTmax, to define a direction and Æ is “associated” more probable to findd. N a chg particle look at the It the density, /dhdf, in “min-bias” collisions (p. T > 0. 5 accompanying PTmax than it is to Ge. V/c, |h| < 1). find a particle in the central region! Shows the data on the Df dependence of the “associated” charged particle density, d. Nchg/dhdf, for charged particles (p. T > 0. 5 Ge. V/c, |h| < 1, not including PTmax) relative to PTmax (rotated to 180 o) for “min-bias” events. Also shown is the average charged particle density, d. Nchg/dhdf, for “min-bias” events. FNAL-CMS MC Generator Meeting June 7, 2007 Rick Field – Florida/CMS 17
CDF Run 2 Min-Bias “Associated” Rapid rise in the particle Charged Particle Density density in the “transverse” region as PTmax increases! PTmax > 2. 0 Ge. V/c Transverse Region Ave Min-Bias 0. 25 per unit h-f Transverse Region PTmax > 0. 5 Ge. V/c Æ Shows the data on the Df dependence of the “associated” charged particle density, d. Nchg/dhdf, for charged particles (p. T > 0. 5 Ge. V/c, |h| < 1, not including PTmax) relative to PTmax (rotated to 180 o) for “min-bias” events with PTmax > 0. 5, 1. 0, and 2. 0 Ge. V/c. Æ Shows “jet structure” in “min-bias” collisions (i. e. the “birth” of the leading two jets!). FNAL-CMS MC Generator Meeting June 7, 2007 Rick Field – Florida/CMS 18
CDF Run 2 Min-Bias “Associated” Charged Particle Density PY Tune A PTmax > 2. 0 Ge. V/c Transverse Region PTmax > 0. 5 Ge. V/c Æ Shows the data on the Df dependence of the “associated” charged particle density, d. Nchg/dhdf, for charged particles (p. T > 0. 5 Ge. V/c, |h| < 1, not including PTmax) relative to PTmax (rotated to 180 o) for “min-bias” events with PTmax > 0. 5 Ge. V/c and PTmax > 2. 0 Ge. V/c compared with PYTHIA Tune A (after CDFSIM). Æ PYTHIA Tune A predicts a larger correlation than is seen in the “min-bias” data (i. e. Tune A “min-bias” is a bit too “jetty”). FNAL-CMS MC Generator Meeting June 7, 2007 Rick Field – Florida/CMS 19
Tune Summary Tevatron LHC Æ PYTHIA Tune DW is very similar to Tune A except that it fits the CDF PT(Z) distribution and it uses the DØ prefered value of PARP(67) = 2. 5 (determined from the dijet Df distribution). Æ PYTHIA Tune DWT is identical to Tune DW at 1. 96 Te. V but uses the ATLAS energy extrapolation to the LHC (i. e. PARP(90) = 0. 16). Æ PYTHIA Tune D 6 and D 6 T are similar to Tune DW and DWT, respectively, but use CTEQ 6 L (i. e. LHAPDF = 10042). Æ PYTHIA Tune QK and QKT uses the NLO PDF CTEQ 6. 1 M (i. e. LHAPDF = 10100 or 10150 which are the same) and use the “K-factor” to get the right amount of MPI. Not favored at present! FNAL-CMS MC Generator Meeting June 7, 2007 Rick Field – Florida/CMS 20
Next Round of Tunes? Torbjorn has made comparing. LHC tunes easy! Tevatron Æ I do not believe that we should continue to produce PYTHIA 6. 2 tunes! Æ We need one good PYTHIA 6. 2 tune as a “reference tune” for the LHC (like tune DWT) to compare with early CMS data. Æ Depending on what we see early on at CMS, we might make one new PYTHIA 6. 2 tune, BUT we need to start tuning the new Monde-Carlo generators (PYTHIA 6. 4, PYTHIA 8. 0, Sherpa, HERWIG + JIMMY, etc. ) Æ We need to be able to easily validate the tunes within the CMS software framework. I hope Steve Mrenna will take charge of this effort! FNAL-CMS MC Generator Meeting June 7, 2007 Rick Field – Florida/CMS 21
- Interactive ultrasound simulator
- Montecarlo
- Metodo montecarlo esempio
- Montecarlo
- Montecarlo
- Short run vs long run economics
- Run lola run wiki
- Short run equilibrium
- Multirule plus
- Themes in run lola run
- Short run and long run equilibrium in perfect competition
- Run lola run editing techniques
- Brigitta olsen
- Carlo kopp
- Matlab cdf 그리기
- Cdf
- Cdf-s xt1
- Application of beta distribution
- Exponential distribution example
- Cdf for uniform distribution
- Binomial cdf
- Tevatron cdf