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StandardModelFurtherResultsWZJets

Introduction

This page collects ATLAS public results from the Standard Model W/Z+jets physics subgroup that were approved after the submission of the CSC chapter "Production of jets in association with Z bosons".

Additional Results from the CSC Group (approved July 2008)

Event selection

Z→e+e-

Z→μ+μ-

W→eν

W→μν

Lepton triggering and reconstruction

NJets_new.png h_NJets_ProbEle_Medium_histo_eff.png

Figure 1: Electron trigger efficiency (left) and electron reconstruction efficiency (right) as a function of number of jets in the event. The trigger efficiency drops with hadronic activity, but the reconstruction efficiency is stable. The efficiency is measured with a tag-and-probe method, and the MC histograms are derived from MC truth information.

Signal efficiency and background rates

Zee_Njet.png Zmm_SM_njets_new81101.png

Wenu_missETcut_jetNCumul_trackIsol_newstyle.png Wmunu_njets.png

Figure 2: Jet multiplicity distributions for Z→ee (top left), Z→μμ (top right), W→eν (bottom left), and W→μν (bottom right).


Zee_Jpt0.png Zmm_SMptleadjetbgdpythiaFactor.png

Wenu_missETcut_firstjetET_trackIsol_newstyle.png Wmunu_LeadJet_et.png

Figure 3: Transverse momentum distributions for the leading jet in Z→ee (top left), Z→μμ (top right), W→eν (bottom left), and W→μν (bottom right).


Zee_Jpt1.png Zmm_SMpt2leadjetbgdpythiaFactor.png

Figure 4: Transverse momentum distributions for the second-leading jet in Z→ee (left) and Z→μμ (right).


Zee_Minv1.png Zmm_SM_invmass_new81101.png

Figure 5: Dilepton invariant mass distributions for Z→ee (left) and Z→μμ (right).


Wenu_eleETcut_MT_trackIsol_newstyle.png

Figure 6: Transverse mass of electron and missing energy in W→eν events.


Zb_et_finale_new.png Zb_et_btag_new.png

Figure 7: Transverse momentum of jets in Z→μ&mu + jet events before (left) and after (right) applying b-tagging. The b-tagging algorithm is the SV1 and IP3D combination.

Systematic uncertainties

Zmm_14jes_njets_new.png Zmm_14jeserror_njets_new.png

Wenu_JES_Jet_CumN.png Wenu_JES_Jet_CumNerror.png

Wmunu_njets_new_correct_jes1.png Wmunu_njets_new_correct_jes2.png

Figure 8: Jet multiplicity with uncertainties due to jet energy scale. Plots show the jet multiplicity distributions for Z→μμ (top left), W→eν (middle left), and W→μν (bottom left), plus the relative uncertainty for Z→μμ (top right), W→eν (middle right), and W→μν (bottom right).


Zmm_13jespt.png Zmm_13jespterror.png

Wenu_JES_LeadJetPtAll.png Wenu_JES_LeadJetPtAllerror.png

Figure 9: Leading jet transverse momentum distribution with uncertainties due to jet energy scale. Plots show the leading jet pT distributions for Z→μμ (top left), W→eν (top right), plus the relative uncertainties for Z→μμ (bottom left), W→eν (bottom right).


Wenu_PDF_leading_jet_MinJetEtcut_et.png Wenu_PDF_leading_jet_MinJetEtcut_eterror.png

Figure 10: Impact of PDF uncertainty on W→eν analysis. We have reweighted the sample from CTEQ6LL (used at generation) to the central value of CTEQ6M. The CTEQ6M error sets are used to calculate the uncertainties on the leading jet pT (left) and the relative uncertainty on the distribution (right).


Wenu_PDF_jet_MinJetEtcut_Eta.png Wenu_PDF_jet_MinJetEtcut_etaerror.png

Figure 11: Impact of PDF uncertainty on W→eν analysis. We have reweighted the sample from CTEQ6LL (used at generation) to the central value of CTEQ6M. The CTEQ6M error sets are used to calculate the uncertainties on the jet η distribution (left) and the relative uncertainty on the distribution (right).

Comparisons with theory

Zee_AlpJpt0CorrLin.png Zee_AlpJpt1CorrLin.png

Figure 12: The detector effects in observed distributions must be unfolded for comparison with theory. These plots show the corrections in the Z→ee channel for electron reconstruction and trigger efficiency, as well as the corrections for the jet reconstruction efficiency and resolution. The hadron-level distributions from Monte Carlo truth are recovered for the leading jet pT distribution (left) and the second-leading jet pT distribution (right).


Zmm_C4_corr_frag_jpt.png Zmm_C4_corr_all_jpt.png

Figure 13: An additional unfolding or correction takes the results from the hadron level back to the parton level for comparisons. These corrections to the jet pT distributions account for fragmentation (left) or for fragmentation and underlying event (right). The corrections decrease with increasing jet pT.


Zee_Res_Njet_Reco.png Zee_Res_Jpt0_Reco.png

Figure 14: Fully-simulated ALPGEN Monte Carlo distributions from Z→ee events are corrected, using all previous correction factors, for comparison with the MCFM cross section calculation. The jet multiplicity (left) and leading jet momentum (right) are plotted with statistical errors expected from a 1 fb-1 sample. A JES uncertainty of 3% is used in this unfolding exercise.


Zee_JES_Error_All.png Zee_JES_Pt_Error_All.png

Figure 15: Relative uncertainties on the data-theory comparison in Z→ee events, including the uncertainties from all sources. The uncertainties are given for the jet multiplicity spectrum (left) and the leading jet pT distribution (right). Note the JES uncertainty scales of 5% and 10%.


Major updates:
-- JasonNielsen - 23 Mar 2009

Responsible: JasonNielsen
Last reviewed by: Never reviewed

Topic attachments
I Attachment History Action Size Date Who Comment
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Unknown file formateps Wenu_JES_LeadJetPtAll.eps r1 manage 15.7 K 2009-03-22 - 06:47 JasonNielsen Wenu JES uncertainty lead jet pT
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Unknown file formateps Wenu_JES_LeadJetPtAll_240GeV_forSM_2July08error.eps r1 manage 13.9 K 2009-03-22 - 06:49 JasonNielsen Wenu JES relative uncertainty lead jet pT
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Unknown file formateps Wenu_PDF_jet_MinJetEtcut_Eta.eps r1 manage 15.1 K 2009-03-22 - 19:12 JasonNielsen Wenu PDF uncertainty lead jet eta
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Unknown file formateps Wenu_PDF_jet_MinJetEtcut_etaerror.eps r1 manage 14.4 K 2009-03-22 - 19:13 JasonNielsen Wenu PDF relative uncertainty lead jet eta
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Unknown file formateps Wenu_PDF_leading_jet_MinJetEtcut_et.eps r1 manage 12.3 K 2009-03-22 - 19:08 JasonNielsen Wenu PDF uncertainty lead jet pT
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Unknown file formateps Wenu_eleETcut_MT_trackIsol_newstyle.eps r1 manage 24.3 K 2009-03-17 - 17:04 JasonNielsen Wenu expected transverse ele-Etmiss transverse mass
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Unknown file formateps Wenu_missETcut_firstjetET_trackIsol_newstyle.eps r1 manage 19.0 K 2009-03-17 - 17:02 JasonNielsen Wenu expected leading jet pT
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Unknown file formateps Wenu_missETcut_jetNCumul_trackIsol_newstyle.eps r1 manage 14.2 K 2009-03-17 - 17:01 JasonNielsen Wenu expected number of jets
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Unknown file formateps Wmunu_LeadJet_et.eps r1 manage 14.2 K 2009-03-19 - 18:19 JasonNielsen Wmunu expected leading jet pT
PNGpng Wmunu_LeadJet_et.png r1 manage 30.3 K 2009-03-19 - 18:21 JasonNielsen  
Unknown file formateps Wmunu_njets.eps r1 manage 14.3 K 2009-03-19 - 18:18 JasonNielsen Wmunu expected number of jets
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Unknown file formateps Wmunu_njets_new_correct_jes1.eps r1 manage 13.0 K 2009-03-22 - 06:35 JasonNielsen Wmunu JES uncertainty Njets
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Unknown file formateps Wmunu_njets_new_correct_jes2.eps r1 manage 11.6 K 2009-03-22 - 06:35 JasonNielsen Wmunu JES relative uncertainty Njets
PNGpng Wmunu_njets_new_correct_jes2.png r1 manage 20.7 K 2009-03-22 - 06:36 JasonNielsen  
Unknown file formateps Zb_et_btag_new.eps r1 manage 16.7 K 2009-03-20 - 02:33 JasonNielsen Zbb jet Et after b-tagging
PNGpng Zb_et_btag_new.png r1 manage 29.5 K 2009-03-20 - 02:33 JasonNielsen  
Unknown file formateps Zb_et_finale_new.eps r1 manage 13.7 K 2009-03-20 - 02:32 JasonNielsen Zbb jet Et before b-tagging
PNGpng Zb_et_finale_new.png r1 manage 27.3 K 2009-03-20 - 02:32 JasonNielsen  
Unknown file formateps Zee_AlpJpt0CorrLin.eps r1 manage 18.8 K 2009-03-23 - 23:38 JasonNielsen Zee unfolding leading jet pT
PNGpng Zee_AlpJpt0CorrLin.png r1 manage 19.7 K 2009-03-23 - 23:38 JasonNielsen  
Unknown file formateps Zee_AlpJpt1CorrLin.eps r1 manage 17.1 K 2009-03-23 - 23:39 JasonNielsen Zee unfolding second-leading jet pT
PNGpng Zee_AlpJpt1CorrLin.png r1 manage 20.3 K 2009-03-23 - 23:39 JasonNielsen  
Unknown file formateps Zee_JES_Error_All.eps r1 manage 13.1 K 2009-03-24 - 00:27 JasonNielsen Zee JES theory comparison Njets
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Unknown file formateps Zee_JES_Pt_Error_All.eps r1 manage 35.4 K 2009-03-24 - 00:35 JasonNielsen Zee JES theory comparison leading jet pT
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Unknown file formateps Zee_Jpt0.eps r1 manage 15.8 K 2009-03-16 - 23:30 JasonNielsen Zee expected leading jet pT
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Unknown file formateps Zee_Jpt1.eps r1 manage 15.6 K 2009-03-16 - 23:31 JasonNielsen Zee expected second jet pT
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Unknown file formateps Zee_Minv1.eps r1 manage 19.9 K 2009-03-16 - 23:31 JasonNielsen Zee dilepton invariant mass
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Unknown file formateps Zee_Njet.eps r1 manage 12.2 K 2009-03-16 - 23:29 JasonNielsen Zee expected number of jets
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Unknown file formateps Zee_Res_Jpt0_Reco.eps r1 manage 14.5 K 2009-03-24 - 00:25 JasonNielsen Zee MCFM comparison leading jet pT
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Unknown file formateps Zee_Res_Njet_Reco.eps r1 manage 11.7 K 2009-03-24 - 00:24 JasonNielsen Zee MCFM comparison Njets
PNGpng Zee_Res_Njet_Reco.png r1 manage 14.7 K 2009-03-24 - 00:24 JasonNielsen  
Unknown file formateps Zmm_13jespt.eps r1 manage 14.8 K 2009-03-22 - 06:46 JasonNielsen Zmumu JES uncertainty lead jet pT
PNGpng Zmm_13jespt.png r1 manage 24.1 K 2009-03-22 - 06:46 JasonNielsen  
Unknown file formateps Zmm_13jespterror.eps r1 manage 14.6 K 2009-03-22 - 06:48 JasonNielsen Zmumu JES relative uncertainty lead jet pT
PNGpng Zmm_13jespterror.png r1 manage 26.5 K 2009-03-22 - 06:48 JasonNielsen  
Unknown file formateps Zmm_14jes_njets.eps r1 manage 10.2 K 2009-03-22 - 06:28 JasonNielsen Zmumu JES uncertainty Njets
PNGpng Zmm_14jes_njets_new.png r1 manage 18.7 K 2009-03-22 - 06:29 JasonNielsen  
Unknown file formateps Zmm_14jeserror_njets.eps r1 manage 9.6 K 2009-03-22 - 06:41 JasonNielsen Zmumu JES relative uncertainty Njets
PNGpng Zmm_14jeserror_njets_new.png r1 manage 20.8 K 2009-03-22 - 06:42 JasonNielsen  
Unknown file formateps Zmm_C4_corr_all_jpt.eps r1 manage 11.5 K 2009-03-23 - 23:42 JasonNielsen Zmumu parton-level correction with UE
PNGpng Zmm_C4_corr_all_jpt.png r1 manage 18.9 K 2009-03-23 - 23:42 JasonNielsen  
Unknown file formateps Zmm_C4_corr_frag_jpt.eps r1 manage 11.5 K 2009-03-23 - 23:40 JasonNielsen Zmumu parton-level correction
PNGpng Zmm_C4_corr_frag_jpt.png r1 manage 17.9 K 2009-03-23 - 23:41 JasonNielsen  
PNGpng Zmm_SM_invmass_new81101.png r1 manage 13.4 K 2009-03-17 - 00:29 JasonNielsen Zmumu dilepton invariant mass
PNGpng Zmm_SM_njets_new81101.png r1 manage 10.4 K 2009-03-17 - 00:26 JasonNielsen Zmumu expected number of jets
PNGpng Zmm_SMpt2leadjetbgdpythiaFactor.png r1 manage 13.3 K 2009-03-17 - 00:28 JasonNielsen Zmumu expected second jet pT
PNGpng Zmm_SMptleadjetbgdpythiaFactor.png r1 manage 13.4 K 2009-03-17 - 00:28 JasonNielsen Zmumu expected leading jet pT
Unknown file formateps h_NJets_ProbEle_Medium_histo_eff.eps r1 manage 12.5 K 2009-03-16 - 23:17 JasonNielsen Electron reconstruction efficiency as a function of number of jets
PNGpng h_NJets_ProbEle_Medium_histo_eff.png r1 manage 22.3 K 2009-03-16 - 23:17 JasonNielsen  
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