Difference: StandardModelCSCResultsWZJets (1 vs. 10)

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StandardModelCSCResultsWZJets

Revision 92010-05-10 - PatrickJussel

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Revision 82009-11-24 - PatrickJussel

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StandardModelCSCResultsWZJets

Revision 72009-10-23 - AlessandroTricoli

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META TOPICPARENT name="StandardModelPublicResults"
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Process σ (fb) frac(%) σ (fb) frac(%) σ (fb) frac(%)
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Z->ll+ >=1 jet Z->ll+ >=3 jet Z->ll+ >=3 jet
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Z->ll+ >=1 jet Z->ll+ >=2 jet Z->ll+ >=3 jet
 
Z->e+e- + jets analysis
Z->e+e- 23520145 91.90.8 489445 87.91.3 90015 80.02.4
QCD jets 154589 6.00.4 33642 6.00.8 7820 6.91.8

Revision 62009-01-12 - AlessandroTricoli

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<!--For significant updates to the topic, consider adding your 'signature' (beneath this editing box)-->
Major updates:
-- StefanTapprogge - 5 Dec 2008
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-- AlessandroTricoli - 12 Jan 2009
 
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Last reviewed by: -- AlessandroTricoli - 12 Jan 2009
 

Revision 52009-01-12 - AlessandroTricoli

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META TOPICPARENT name="StandardModelPublicResults"
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This page provides information and plots for W/Z+jets studies from ATLAS CSC book, as

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published in

ATLAS Collaboration, Expected Performance of the ATLAS Experiment, Detector, Trigger and Physics, CERN-OPEN-2008-020, Geneva, 2008, to appear.

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published in ATLAS Collaboration, Expected Performance of the ATLAS Experiment, Detector, Trigger and Physics, Geneva 2008. CERN-OPEN-2008-020, ISBN978-92-9083-321-5, arXiv:0901.0512v1 [hep-ex].
 

Production of Jets in Association with Z Bosons

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Results Tables

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Z+1 jet Z+2 jets Z+3 jets
Process sigma (fb) fraction (%) sigma (fb) fraction (%) sigma (fb) fraction (%)
Z->ee 0 0 0 0 0 0
QCD jets 0 0 0 0 0 0
ttbar 0 0 0 0 0 0
W->eν 0 0 0 0 0 0
Z->ττ 0 0 0 0 0 0
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Process σ (fb) frac(%) σ (fb) frac(%) σ (fb) frac(%)
Z->ll+ >=1 jet Z->ll+ >=3 jet Z->ll+ >=3 jet
Z->e+e- + jets analysis
Z->e+e- 23520145 91.90.8 489445 87.91.3 90015 80.02.4
QCD jets 154589 6.00.4 33642 6.00.8 7820 6.91.8
ttbar 49628 1.90.1 33323 6.00.4 14615 13.01.4
W->eν (2813) (0.10.05) (5.92.6) (0.10.05) (1.10.5) (0.10.05)
Z->ττ 3.21.2 0.010.01 (0.670.25) (0.010.01) (0.10.05) (0.010.01)
Z->μ+μ- + jets analysis
Z->μ+μ- 59400650 96.21.0 12600300 90.11.9 2450100 89.73.7
QCD (bbar) 1230550 2.00.9 600300 4.32.2 0110 0.04.0
ttbar 1140110 1.81.8 79090 5.70.2 27550 10.21.9
W->μν 0180 0.00.3 030 0.00.2 05 0.00.2

Caption Table 1: The accepted cross-sections (σ , in fb) and the corresponding fraction of the total sample (in %) for signal and for the background channels in the Z->e+e- +jets and the Z->μ+μ- +jets analyses, after applying the cuts outlined in Section 3. The numbers in brackets are extrapolated from results obtained for a lower jet multiplicity. Errors shown are statistical only.

 
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Revision 42008-12-19 - AlessandroTricoli

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Measurement of Z + jets Cross-Sections

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  • Caption Figure 1: The distribution of the di-muon mass (a) and the inclusive jet multiplicity (b) for signal and backgrounds in the muon channel. In order to provide higher statistics for the background determination, background events in an invariant mass window of 51−131 GeV, are scaled down for an invariant mass window of 81−101 GeV. Also shown is the distribution of pT of the leading (c) and the next-to-leading (d) jet in the electron channel for Ldt = 1 fb-1. The vertical lines in (a), (c) and (d) indicate the kinematic cuts applied in the analysis.

(a) Z(mu,mu) invariant mass for signal + background (.eps) (.png):
SM_invmass_new81101.png

(b) Inclusive jet multiplicity (signal+background) (.eps) (.png):
SM_njets_new81101.png

(c) PT leading jet distribution for signal+backgrounds (.eps) (.png):
Ana_Jpt0.png

(d) PT 2nd leading jet for signal+backgrounds (.eps) (.png):
Ana_Jpt1.png

  • Caption Figure 2: Comparison of the distribution of the pT of the leading jet (a) and the next-to-leading jet (b) for the generated (hadron-level) Monte Carlo and for the reconstructed quantities without any correction, after the corrections for electron triggering and reconstruction and after applying in addition the jet-releated corrections.

(a) Leading jet (.eps)(.png):
AlpJpt0CorrLin.png

(b) Second leading jet (.eps)(.png):
AlpJpt1CorrLin.png

  • Caption Figure 3: Comparison of the inclusive jet cross-section (a) and the pT of the leading jet (b) and of the next-to-leading jet (c) for the Z -> m+m- +jets channel from PYTHIA and ALPGEN Monte Carlo with NLO (LO) MCFM predictions. The MCFM predictions have been corrected to the hadron level.

(a) Inclusive jet cross-section (.eps)(.png):
10njetsmcfmtruth.png

(b) PT leading jet (.eps)(.png):
11leadjettruthmcfm.png

(c) PT 2nd leading jet (.eps)(.png):
11lead2jettruthmcfm.png

  • Caption Figure 4: The inclusive jet cross-section (a) and the distribution of the pT of the leading jet (b), as predicted by NLO (LO) MCFM (corrected to the hadron-level) and by ALPGEN for the Z -> e+e- +jets process.

(a) Inclusive Jet Multiplicity (.eps)(.png):
Res_Njet_Reco.png

(b) PT leading jet (.eps)(.png):
Res_Jpt0_Reco.png

  • Caption Figure 5: Uncertainty on the ratio of measurement and theory for the inclusive jet cross-section (a) and the pT of the leading jet (b) for the Z -> e+e- +jets process.

(a) Uncertainty on the inclusive jet cross-section (.eps)(.png):
JES_Error_All.png

(b) Uncertainty on the PT of the leading jet (.eps)(.png):
JES_Pt_Error_All.png

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SM_invmass_new81101 SM_njets_new81101 Ana_Jpt0 Ana_Jpt1

Caption Figure 1: The distribution of the di-muon mass (a) and the inclusive jet multiplicity (b) for signal and backgrounds in the muon channel. In order to provide higher statistics for the background determination, background events in an invariant mass window of 51−131 GeV, are scaled down for an invariant mass window of 81−101 GeV. Also shown is the distribution of pT of the leading (c) and the next-to-leading (d) jet in the electron channel for Ldt = 1 fb-1. The vertical lines in (a), (c) and (d) indicate the kinematic cuts applied in the analysis.

AlpJpt0CorrLin AlpJpt1CorrLin

Caption Figure 2: Comparison of the distribution of the pT of the leading jet (a) and the next-to-leading jet (b) for the generated (hadron-level) Monte Carlo and for the reconstructed quantities without any correction, after the corrections for electron triggering and reconstruction and after applying in addition the jet-releated corrections.

10njetsmcfmtruth 11leadjettruthmcfm 11lead2jettruthmcfm

Caption Figure 3: Comparison of the inclusive jet cross-section (a) and the pT of the leading jet (b) and of the next-to-leading jet (c) for the Z -> m+m- +jets channel from PYTHIA and ALPGEN Monte Carlo with NLO (LO) MCFM predictions. The MCFM predictions have been corrected to the hadron level.

Res_Njet_Reco Res_Jpt0_Reco

Caption Figure 4: The inclusive jet cross-section (a) and the distribution of the pT of the leading jet (b), as predicted by NLO (LO) MCFM (corrected to the hadron-level) and by ALPGEN for the Z -> e+e- +jets process.

JES_Error_All JES_Pt_Error_All

Caption Figure 5: Uncertainty on the ratio of measurement and theory for the inclusive jet cross-section (a) and the pT of the leading jet (b) for the Z -> e+e- +jets process.

Results Tables

Z+1 jet Z+2 jets Z+3 jets
Process sigma (fb) fraction (%) sigma (fb) fraction (%) sigma (fb) fraction (%)
Z->ee 0 0 0 0 0 0
QCD jets 0 0 0 0 0 0
ttbar 0 0 0 0 0 0
W->eν 0 0 0 0 0 0
Z->ττ 0 0 0 0 0 0
 
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META FILEATTACHMENT attachment="JES_Pt_Error_All.eps" attr="" comment="Uncertainty on the PT of the leading jet" date="1229694186" name="JES_Pt_Error_All.eps" path="JES_Pt_Error_All.eps" size="36280" stream="JES_Pt_Error_All.eps" user="Main.AlessandroTricoli" version="1"
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Revision 32008-12-19 - AlessandroTricoli

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Abstract

We simulate a measurement of the inclusive Z(->e+e-/m+m-) + jets cross-section with the ATLAS experiment in pp collisions at 14 TeV for an integrated luminosity of 1 fb-1 using fully-simulated signal and background Monte Carlo data sets. The reconstruction of leptons and of missing transverse energy becomes more complex in the presence of a multi-jet final state. We quantify the reconstruction differences with respect to those observed for inclusive Z production. We derive statistical and systematic limitations in terms of probing the perturbative QCD predictions and discriminating between predictions of different event generators.
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4 Measurement of Z + jets Cross-Sections

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Measurement of Z + jets Cross-Sections

 
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Caption Figure 1: The distribution of the di-muon mass (a) and the inclusive jet multiplicity (b) for signal and backgrounds in the muon channel. In order to provide higher statistics for the background determination, background events in an invariant mass window of 51−131 GeV, are scaled down for an invariant mass window of 81−101 GeV. Also shown is the distribution of pT of the leading (c) and the next-to-leading (d) jet in the electron channel for Ldt = 1 fb-1. The vertical lines in (a), (c) and (d) indicate the kinematic cuts applied in the analysis.
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  • Caption Figure 1: The distribution of the di-muon mass (a) and the inclusive jet multiplicity (b) for signal and backgrounds in the muon channel. In order to provide higher statistics for the background determination, background events in an invariant mass window of 51−131 GeV, are scaled down for an invariant mass window of 81−101 GeV. Also shown is the distribution of pT of the leading (c) and the next-to-leading (d) jet in the electron channel for Ldt = 1 fb-1. The vertical lines in (a), (c) and (d) indicate the kinematic cuts applied in the analysis.
 
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(b) Inclusive jet multiplicity (signal+background) (.eps) (.png):
  SM_njets_new81101.png
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(c) PT leading jet distribution for signal+backgrounds (.eps) (.png):
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Caption Figure 2: Comparison of the distribution of the pT of the leading jet (a) and the next-to-leading jet (b) for the generated (hadron-level) Monte Carlo and for the reconstructed quantities without any correction, after the corrections for electron triggering and reconstruction and after applying in addition the jet-releated corrections.
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  • Caption Figure 2: Comparison of the distribution of the pT of the leading jet (a) and the next-to-leading jet (b) for the generated (hadron-level) Monte Carlo and for the reconstructed quantities without any correction, after the corrections for electron triggering and reconstruction and after applying in addition the jet-releated corrections.

(a) Leading jet (.eps)(.png):
AlpJpt0CorrLin.png

(b) Second leading jet (.eps)(.png):
AlpJpt1CorrLin.png

  • Caption Figure 3: Comparison of the inclusive jet cross-section (a) and the pT of the leading jet (b) and of the next-to-leading jet (c) for the Z -> m+m- +jets channel from PYTHIA and ALPGEN Monte Carlo with NLO (LO) MCFM predictions. The MCFM predictions have been corrected to the hadron level.

(a) Inclusive jet cross-section (.eps)(.png):
10njetsmcfmtruth.png

(b) PT leading jet (.eps)(.png):
11leadjettruthmcfm.png

(c) PT 2nd leading jet (.eps)(.png):
11lead2jettruthmcfm.png

  • Caption Figure 4: The inclusive jet cross-section (a) and the distribution of the pT of the leading jet (b), as predicted by NLO (LO) MCFM (corrected to the hadron-level) and by ALPGEN for the Z -> e+e- +jets process.

(a) Inclusive Jet Multiplicity (.eps)(.png):
Res_Njet_Reco.png

(b) PT leading jet (.eps)(.png):
Res_Jpt0_Reco.png

  • Caption Figure 5: Uncertainty on the ratio of measurement and theory for the inclusive jet cross-section (a) and the pT of the leading jet (b) for the Z -> e+e- +jets process.

(a) Uncertainty on the inclusive jet cross-section (.eps)(.png):
JES_Error_All.png

(b) Uncertainty on the PT of the leading jet (.eps)(.png):
JES_Pt_Error_All.png

 
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META FILEATTACHMENT attachment="Ana_Jpt0.png" attr="" comment="Zee pt 1st jet" date="1229687232" name="Ana_Jpt0.png" path="Ana_Jpt0.png" size="15992" stream="Ana_Jpt0.png" user="Main.AlessandroTricoli" version="1"
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Revision 22008-12-19 - AlessandroTricoli

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Production of Jets in Association with Z Bosons

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Abstract

We simulate a measurement of the inclusive Z(->e+e-/m+m-) + jets cross-section with the ATLAS experiment in pp collisions at 14 TeV for an integrated luminosity of 1 fb-1 using fully-simulated signal and background Monte Carlo data sets. The reconstruction of leptons and of missing transverse energy becomes more complex in the presence of a multi-jet final state. We quantify the reconstruction differences with respect to those observed for inclusive Z production. We derive statistical and systematic limitations in terms of probing the perturbative QCD predictions and discriminating between predictions of different event generators.
 
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4 Measurement of Z + jets Cross-Sections

 
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Caption Figure 1: The distribution of the di-muon mass (a) and the inclusive jet multiplicity (b) for signal and backgrounds in the muon channel. In order to provide higher statistics for the background determination, background events in an invariant mass window of 51−131 GeV, are scaled down for an invariant mass window of 81−101 GeV. Also shown is the distribution of pT of the leading (c) and the next-to-leading (d) jet in the electron channel for Ldt = 1 fb-1. The vertical lines in (a), (c) and (d) indicate the kinematic cuts applied in the analysis.

  • (a) Z(mu,mu) invariant mass for signal + background (.eps) (.png):
    SM_invmass_new81101.png

  • (b) Inclusive jet multiplicity (signal+background) (.eps) (.png):
    SM_njets_new81101.png

  • (c) PT leading jet distribution for signal+backgrounds (.eps) (.png):
    Ana_Jpt0.png

  • (d) PT 2nd leading jet for signal+backgrounds (.eps) (.png):
    Ana_Jpt1.png

Caption Figure 2: Comparison of the distribution of the pT of the leading jet (a) and the next-to-leading jet (b) for the generated (hadron-level) Monte Carlo and for the reconstructed quantities without any correction, after the corrections for electron triggering and reconstruction and after applying in addition the jet-releated corrections.

 
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Revision 12008-12-05 - StefanTapprogge

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StandardModelCSCResultsWZJets

Introduction

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This page provides information and plots for W/Z+jets studies from ATLAS CSC book, as published in

ATLAS Collaboration, Expected Performance of the ATLAS Experiment, Detector, Trigger and Physics, CERN-OPEN-2008-020, Geneva, 2008, to appear.

Production of Jets in Association with Z Bosons

plots and more to be put here

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Major updates:
-- StefanTapprogge - 5 Dec 2008

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Responsible: StefanTapprogge
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Last reviewed by: Never reviewed
 
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