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Status of the H4l CSC Note (HG2)

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Presentation on theme: "Status of the H4l CSC Note (HG2)"— Presentation transcript:

1 Status of the H4l CSC Note (HG2)
Daniela Rebuzzi ATLAS Muon Group Meeting - MPI January 22th, 2008 1

2 HG2 Note Status First draft ready before Christmas
Discussion of the editors (S. Rosati and S. Paganis) with referees (G. Unal and N. Wermes) on 16th Jan 46 pages, to be reduced to 30 for the PUB Note Paper quite close to the final version - Final numbers Second discussion with referees foreseen by 28th Jan Sections under revision: WZ and Zbb/Z+jets reducible backgrounds Background extraction from data H4l analysis performed on eight Higgs mass points, from 130 to 300 GeV

3 H4l analysis Signature - main backgrounds
Cross sections evaluated at NLO Trigger efficiencies Reconstructed final state objects electrons muons Event preselection Event selection Rejection of reducible background muon isolation electron isolation impact parameter Results Systematic uncertainties and background estimation Results with full pileup Fit based significance estimation

4 H4l analysis Signature - main backgrounds
Cross sections evaluated at NLO Signal Background

5 H4l analysis Signature - main backgrounds
Cross sections evaluated at NLO Trigger efficiencies GeV - luminosity = 1033 cm-2 s-1

6 H4l analysis efficiencies Signature - main backgrounds
Cross sections evaluated at NLO Trigger efficiencies Reconstructed final state objects electrons muons Event preselection Event selection Rejection of reducible background muon isolation electron isolation impact parameter Results Systematic uncertainties and background estimation Results with full pileup Fit based significance estimation resolution isEM Medium fakes linearity and uniformity

7 H4l analysis efficiencies Signature - main backgrounds
Cross sections evaluated at NLO Trigger efficiencies Reconstructed final state objects electrons muons Event preselection Event selection Rejection of reducible background muon isolation electron isolation impact parameter Results Systematic uncertainties and background estimation Results with full pileup Fit based significance estimation STACO MuTag STACO MuTag resolution fakes

8 H4l analysis Signature - main backgrounds
Cross sections evaluated at NLO Trigger efficiencies Reconstructed final state objects electrons muons Event preselection Event selection Rejection of reducible background muon isolation electron isolation impact parameter Results Systematic uncertainties and background estimation Results with full pileup Fit based significance estimation quality and kinematical selections: lepton pairs: Leading: pT (ET)> 20 GeV Following: pT (ET)> 7 GeV

9 H4l analysis at least 4 leptons (e, ) in pairs of opposite
charge and same flavor electrons: additional lepton pair quality Leading: LooseElectron Following: MediumElectron Z mass constraint (applied to both Z’s if MH > 200 GeV) kinematic cuts Higgs mass window MH ± 2MH Signature - main backgrounds Cross sections evaluated at NLO Trigger efficiencies Reconstructed final state objects electrons muons Event preselection Event selection Rejection of reducible background muon isolation electron isolation impact parameter Results Systematic uncertainties and background estimation Results with full pileup Fit based significance estimation

10 H4l analysis both calorimeter isolation and track isolation
Signature - main backgrounds Cross sections evaluated at NLO Trigger efficiencies Reconstructed final state objects electrons muons Event preselection Event selection Rejection of reducible background muon isolation electron isolation impact parameter Results Systematic uncertainties and background estimation Results with full pileup Fit based significance estimation isolation quantities normalized to the muon pT R = 0.2 cone - - 4 channel

11 H4l analysis track isolation only Signature - main backgrounds
Cross sections evaluated at NLO Trigger efficiencies Reconstructed final state objects electrons muons Event preselection Event selection Rejection of reducible background muon isolation electron isolation impact parameter Results Systematic uncertainties and background estimation Results with full pileup Fit based significance estimation

12 H4l analysis largest transverse impact parameter significance d0/d0
Signature - main backgrounds Cross sections evaluated at NLO Trigger efficiencies Reconstructed final state objects electrons muons Event preselection Event selection Rejection of reducible background muon isolation electron isolation impact parameter Results Systematic uncertainties and background estimation Results with full pileup Fit based significance estimation 4 channel 4e channel

13 H4l analysis Higgs mass resolution Signature - main backgrounds
Cross sections evaluated at NLO Trigger efficiencies Reconstructed final state objects electrons muons Event preselection Event selection Rejection of reducible background muon isolation electron isolation impact parameter Results Systematic uncertainties and background estimation Results with full pileup Fit based significance estimation 4 channel 4e channel Z-mass constraint applied 4e channel 4 channel

14 H4l analysis Signature - main backgrounds
Cross sections evaluated at NLO Trigger efficiencies Reconstructed final state objects electrons muons Event preselection Event selection Rejection of reducible background muon isolation electron isolation impact parameter Results Systematic uncertainties and background estimation Results with full pileup Fit based significance estimation 130 GeV 180 GeV Reconstructed 4-lepton mass after the full event selection NLO cross sections - normalized to 10 fb-1

15 H4l analysis NLO coss secions - Normalized to 10 fb-1 - Not including systematics Results Systematic uncertainties and background estimation Results with full pileup Fit based significance estimation

16 H4l analysis Signature - main backgrounds
Cross sections evaluated at NLO Trigger efficiencies Reconstructed final state objects electrons muons Event preselection Event selection Rejection of reducible background muon isolation electron isolation impact parameter Results Systematic uncertainties and background estimation Results with full pileup Fit based significance estimation theoretical uncertainties (PDF, QCD scales) experimental uncertainties lepton energy scale: correction of 0.1% to pT(ET) lepton energy resolution: Gaussian smearing with ET = 0.01ET (energy) or pT = 0.014pT pT2 (momentum)) lepton reconstruction efficiency: discarded 1% of reco leptons material effects in electron efficiency Impact from 3.3% to 5.9% on the signal and from 4% to 8% on ZZ (under evaluation for the other backgrounds)

17 H4l analysis Signature - main backgrounds
Cross sections evaluated at NLO Trigger efficiencies Reconstructed final state objects electrons muons Event preselection Event selection Rejection of reducible background muon isolation electron isolation impact parameter Results Systematic uncertainties and background estimation Results with full pileup Fit based significance estimation

18 My current contribution
Signature - main backgrounds Cross sections evaluated at NLO Trigger efficiencies Reconstructed final state objects electrons muons Event preselection Event selection Rejection of reducible background muon isolation electron isolation impact parameter Results Systematic uncertainties and background estimation Results with full pileup Fit based significance estimation WZ background with pileup Estimation of the impact of Z+jets background

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