The Underlying Event CDFLHC Comparisons Outline of Talk
- Slides: 21
The “Underlying Event” CDF-LHC Comparisons Outline of Talk Æ Jet Production: The “underlying event” in high p. T jet production in Run 2 at CDF. Æ PT(Z-boson): Tuning to fit the PT(Z) distribution in Run 2 at CDF. Great process to study the “underlying event”! Æ Drell-Yan: The “underlying event” in Drell-Yan production in Run 2 at CDF. Æ Extrapolations to the LHC: The “underlying event” in high p. T jet production and Drell. Yan at CMS. LHC/CMS Journal Club November 30, 2005 Rick Field - Florida/CMS/CDF 1
The “Transverse” Region “Transverse” region is very sensitive to the “underlying event”! as defined by the Leading Jet Charged Particles (p. T > 0. 5 Ge. V/c, |h| < 1) Calorimeter Towers (ET > 0. 1 Ge. V, |h| < 1) Look at the charged particle density and the ETsum density in the “transverse” region! Æ Look at the “transverse” region as defined by the leading calorimeter jet (Mid. Point, R = 0. 7, fmerge = 0. 75, Æ Æ Æ |h| < 2). Define |Df| < 60 o as “Toward”, 60 o < -Df < 120 o and 60 o < Df < 120 o as “Transverse 1” and “Transverse 2”, and |Df| > 120 o as “Away”. Each of the two “transverse” regions have area Dh. Df = 2 x 60 o = 4 p/6. The overall “transverse” region is the sum of the two transverse regions (Dh. Df = 2 x 120 o = 4 p/3). Study the charged particles (p. T > 0. 5 Ge. V/c, |h| < 1) and form the charged particle density, d. Nchg/dhdf, and the charged scalar p. T sum density, d. PTsum/dhdf, by dividing by the area in h-f space. Study the calorimeter towers (ET > 0. 1 Ge. V, |h| < 1) and form the scalar ET sum density, d. ETsum/dhdf. LHC/CMS Journal Club November 30, 2005 Rick Field - Florida/CMS/CDF 2
The “Transverse” Region “Transverse” region recieves contributions from initial & finalstate radiation! as defined by the Leading Jet Charged Particles (p. T > 0. 5 Ge. V/c, |h| < 1) Calorimeter Towers (ET > 0. 1 Ge. V, |h| < 1) Look at the charged particle density and the ETsum density in the “transverse” region! Æ Look at the “transverse” region as defined by the leading calorimeter jet (Mid. Point, R = 0. 7, fmerge = 0. 75, Æ Æ Æ |h| < 2). Define |Df| < 60 o as “Toward”, 60 o < -Df < 120 o and 60 o < Df < 120 o as “Transverse 1” and “Transverse 2”, and |Df| > 120 o as “Away”. Each of the two “transverse” regions have area Dh. Df = 2 x 60 o = 4 p/6. The overall “transverse” region is the sum of the two transverse regions (Dh. Df = 2 x 120 o = 4 p/3). Study the charged particles (p. T > 0. 5 Ge. V/c, |h| < 1) and form the charged particle density, d. Nchg/dhdf, and the charged scalar p. T sum density, d. PTsum/dhdf, by dividing by the area in h-f space. Study the calorimeter towers (ET > 0. 1 Ge. V, |h| < 1) and form the scalar ET sum density, d. ETsum/dhdf. LHC/CMS Journal Club November 30, 2005 Rick Field - Florida/CMS/CDF 3
The “Underlying Event” in High PT Jet Production (CDF) The “Underlying Event” in High PT Jet Production HERWIG (without MPI) lies below the data for PT(jet#1) < 200 Ge. V/c! “Transverse” <Densities> vs PT(jet#1) LHC/CMS Journal Club November 30, 2005 Rick Field - Florida/CMS/CDF 4
The “Central” Region in Drell-Yan Production Charged Particles (p. T > 0. 5 Ge. V/c, |h| < 1) Calorimeter Towers (ET > 0. 1 Ge. V, |h| < 1) Look at the charged particle density and the ETsum density in the “central” region! After removing the leptonpair everything else is the “underlying event”! Æ Look at the “central” region after removing the lepton-pair. Æ Study the charged particles (p. T > 0. 5 Ge. V/c, |h| < 1) and form the charged particle density, Æ d. Nchg/dhdf, and the charged scalar p. T sum density, d. PTsum/dhdf, by dividing by the area in h-f space. Study the calorimeter towers (ET > 0. 1 Ge. V, |h| < 1) and form the scalar ET sum density, d. ETsum/dhdf. LHC/CMS Journal Club November 30, 2005 Rick Field - Florida/CMS/CDF 5
CDF Run 1 PT(Z) PYTHIA 6. 2 CTEQ 5 L UE Parameters ISR 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 PARP(89) 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 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). Intrensic KT LHC/CMS Journal Club November 30, 2005 Rick Field - Florida/CMS/CDF 6
CDF Run 1 PT(Z) PYTHIA 6. 2 CTEQ 5 L UE Parameters ISR Parameters Parameter Tune AW 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 Intrensic KT LHC/CMS Journal Club November 30, 2005 Æ Shows the Run 1 Z-boson p. T distribution (<p. T(Z)> ≈ 11. 5 Ge. V/c) compared with PYTHIA Tune AW (<p. T(Z)> = 11. 7 Ge. V/c). Effective Q cut-off, below which space-like showers are not evolved. The Q 2 = k. T 2 in as for space-like showers is scaled by PARP(64)! Rick Field - Florida/CMS/CDF 7
Drell-Yan Production at CDF <PT(pair)> versus M(pair) Lepton-Pair Transverse Momentum Z Z Æ Shows the lepton-pair average PT versus the lepton-pair invariant mass at 1. 96 Te. V for PYTHIA Tune AW and HERWIG. PYTHIA Tune AW and PYTHIA Tune A. LHC/CMS Journal Club November 30, 2005 Rick Field - Florida/CMS/CDF 8
Drell-Yan Production at CMS <PT(pair)> versus M(pair) Lepton-Pair Transverse Momentum The lepton-pair <PT> much larger at the LHC! Z Z Æ Shows the lepton-pair average PT versus the lepton-pair invariant mass at 14 Te. V for lepton-pair invariant mass at 1. 96 Te. V for PYTHIA Tune AW and HERWIG. LHC/CMS Journal Club November 30, 2005 Rick Field - Florida/CMS/CDF 9
The “Underlying Event” in Drell-Yan Production (CDF) The “Underlying Event” Charged particle density versus M(pair) HERWIG (without MPI) is much less active than PY Tune AW (with MPI)! Z Z Æ Shows the charged particle density versus the lepton-pair invariant mass at 1. 96 Te. V for PYTHIA Tune AW and HERWIG (with no MPI). LHC/CMS Journal Club November 30, 2005 Rick Field - Florida/CMS/CDF 10
The “Underlying Event” in Drell-Yan Production (CMS) The “Underlying Event” Charged particle density versus M(pair) HERWIG (without MPI) is much less active than PY Tune AW (with MPI)! “Underlying event” much more active at the LHC! Z Æ Charged particle density versus the lepton-pair invariant mass at 1. 96 Te. V for PYTHIA invariant mass at 14 Te. V for PYTHIA Tune AW and HERWIG (without MPI). LHC/CMS Journal Club November 30, 2005 Rick Field - Florida/CMS/CDF 11
The “Underlying Event” in Drell-Yan Production (CDF) Charged PTsum density versus M(pair) The “Underlying Event” HERWIG (without MPI) is much less active than PY Tune AW (with MPI)! Z Æ Shows the charged PTsum density versus the lepton-pair invariant mass at 1. 96 Te. V for PYTHIA Tune AW and HERWIG (without MPI). LHC/CMS Journal Club November 30, 2005 Rick Field - Florida/CMS/CDF 12
The “Underlying Event” in Drell-Yan Production (CMS) Charged PTsum density versus M(pair) The “Underlying Event” HERWIG (without MPI) is much less active than PY Tune AW (with MPI)! “Underlying event” much more active at the LHC! Z Æ Charged PTsum density versus the lepton-pair Æ Charged PTsum density versus the leptonpair invariant mass at 14 Te. V for PYTHIA invariant mass at 1. 96 Te. V for PYTHIA Tune AW and HERWIG (without MPI). LHC/CMS Journal Club November 30, 2005 Rick Field - Florida/CMS/CDF 13
The “Underlying Event” in Drell-Yan Production (CMS) The “Underlying Event” ETsum density versus M(pair) Z Z Æ ETsum density versus the lepton-pair invariant mass at 1. 96 Te. V for PYTHIA Tune mass at 14 Te. V for PYTHIA Tune AW and HERWIG (without MPI). LHC/CMS Journal Club November 30, 2005 Rick Field - Florida/CMS/CDF 14
The “Underlying Event” Drell-Yan vs Jets at CDF The “Underlying Event” in High PT Lepton-Pair and Jet Production Drell-Yan LHC/CMS Journal Club November 30, 2005 “Leading Jet” Rick Field - Florida/CMS/CDF 15
The “Underlying Event” in High PT Jet Production (CMS) The “Underlying Event” Charged particle density versus PT(jet#1) “Underlying event” much more active at the LHC! Æ Charged particle density in the “Transverse” region versus PT(jet#1) at 1. 96 Te. V for PY region versus PT(jet#1) at 14 Te. V for PY Tune AW and HERWIG (without MPI). LHC/CMS Journal Club November 30, 2005 Rick Field - Florida/CMS/CDF 16
The “Underlying Event” in High PT Jet Production (CMS) The “Underlying Event” Charged PTsum density versus PT(jet#1) “Underlying event” much more active at the LHC! Æ Charged PTsum density in the “Transverse” region versus PT(jet#1) at 1. 96 Te. V for PY region versus PT(jet#1) at 14 Te. V for PY Tune AW and HERWIG (without MPI). . LHC/CMS Journal Club November 30, 2005 Rick Field - Florida/CMS/CDF 17
The “Underlying Event” in High PT Jet Production (CMS) The “Underlying Event” ETsum density versus PT(jet#1) “Underlying event” much more active at the LHC! Æ ETsum density in the “Transverse” region versus PT(jet#1) at 1. 96 Te. V for PY Tune AW versus PT(jet#1) at 14 Te. V for PY Tune AW and HERWIG (without MPI). LHC/CMS Journal Club November 30, 2005 Rick Field - Florida/CMS/CDF 18
The “Underlying Event” Drell-Yan vs Jets at CMS The “Underlying Event” in High PT Lepton-Pair and Jet Production Drell-Yan LHC/CMS Journal Club November 30, 2005 “Leading Jet” Rick Field - Florida/CMS/CDF 19
UE&MB@CMS Æ Min-Bias Studies: Charged particle distributions and correlations. Construct “charged particle jets” and look at “mini-jet” structure and the onset of the “underlying event”. (requires only charged tracks) Æ “Underlying Event” Studies: The “transverse region” in “leading Jet” and “back-to-back” jet production. The “central region” in Drell-Yan production. (requires charged tracks and calorimeter and muons for Drell-Yan) Æ Drell-Yan Studies: Transverse momentum distribution of the lepton-pair versus the mass of the lepton-pair, <p. T(pair)>, <p. T 2(pair)>, ds/dp. T(pair) (only requires muons). Event structure for large lepton-pair p. T (i. e. mm +jets, requires muons and calorimeter). LHC/CMS Journal Club November 30, 2005 Rick Field - Florida/CMS/CDF 20
UE&MB@CMS Æ Min-Bias Studies: Charged particle distributions and correlations. Construct “charged particle jets” and look at “mini-jet” structure and the onset of the “underlying event”. (requires only charged tracks) UE&MB@CMS Æ “Underlying Event” Studies: The “transverse region” in Rick Field “leading Jet” and(Florida) “back-to-back” jet production. The Darin Acosta (Florida) “central region” in Drell-Yan production. (requires charged Albert De Roeck (CERN) tracks and calorimeter and muons for Drell-Yan) Paolo Bartalini (UF Postdoc at CERN) Livio Fano' (INFN/Perugia at CERN) Filippo Ambroglini (INFN/Perugia at CERN) Æ Drell-Yan Studies: Transverse momentum distribution of the lepton-pair versus the mass of the lepton-pair, <p. T(pair)>, <p. T 2(pair)>, ds/dp. T(pair) (only requires muons). Event structure for large lepton-pair p. T (i. e. mm +jets, requires muons and calorimeter). LHC/CMS Journal Club November 30, 2005 Rick Field - Florida/CMS/CDF 21
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