Search for new physics with same-sign isolated dilepton events with jets and missing energy

Abstract

A search for new physics is performed in events with two same-sign isolated leptons, hadronic jets, and missing transverse energy in the final state. The analysis is based on a data sample corresponding to an integrated luminosity of 4.98 inverse femtobarns produced in pp collisions at a center-of-mass energy of 7 TeV collected by the CMS experiment at the LHC. This constitutes a factor of 140 increase in integrated luminosity over previously published results. The observed yields agree with the standard model predictions and thus no evidence for new physics is found. The observations are used to set upper limits on possible new physics contributions and to constrain supersymmetric models. To facilitate the interpretation of the data in a broader range of new physics scenarios, information on the event selection, detector response, and efficiencies is provided.

Link to the 1 fb-1 study PAS CMS-PAS-SUS-11-010

Link to the 4.98 fb-1 study, CMS-SUS-11-010, arXiv:1205.6615, Submitted to PRL

Approved Tables and Plots from SUS-11-010 with 4.98 fb-1 ( click on plot to get .pdf )

Table Abbreviated Caption
Table1.png Table 1: Observed number of events in data compared to the predicted background yields for the considered search regions. The uncertainties include the statistical and systematic components added in quadrature. Signal uncertainty of 20% is assumed for the upper limits on the event yields.

Figure Abbreviated Caption
fig1.png Figure 1 : Selected SS di-lepton events in the various search regions displayed in HT -MET plane.
fig2.png Figure 2 : Summary of background predictions and observed yields in the various search regions. The shaded bands represent the total uncertainty on the background predictions.
fig3.png Figure 3 : Exclusion region in the CMSSM corresponding to the observed upper limits on the number events from new physics. The result of the previous analysis is shown to illustrate the improvement since

Approved Tables and Plots from SUS-11-010 as part of additional materials ( click on plot to get .pdf )

Figure Abbreviated Caption
misc1.png Figure 1 : Exclusion contour (95% C.L.) in m( g)-m(χ0 ) plane for simplified model pp -> gluino gluino; gluino -> 2 q tau nu chi10
FRatio_Electrons_Eta.png Figure 2 : Tight-to-loose ratios using method for the non-prompt lepton control region for electrons
FRatio_Electrons_Pt.png Figure 3 : Tight-to-loose ratios using method for the non-prompt lepton control region for electrons
FRatio_Muons_Eta.png Figure 4 : Tight-to-loose ratios using method for the non-prompt lepton control region for muons
FRatio_Muons_Pt.png Figure 5 : Tight-to-loose ratios using method for the non-prompt lepton control region for muons
PRatio_Electrons_Pt.png Figure 6 : Tight-to-loose ratios using method for leptons from Z decays in the prompt lepton control region, for electrons, as a function of their transverse momenta
PRatio_Muons_Pt.png Figure 7 : Tight-to-loose ratios using method for leptons from Z decays in the prompt lepton control region, for muons, as a function of their transverse momenta
ObsPred_HT1_lin.png Figure 8 : Predicted and observed event yields as a function of HT for high pT leptons
ObsPred_HT2_lin.png Figure 9 : Predicted and observed event yields as a function of HT for high pT leptons
ObsPred_MET1_lin.png Figure 10 : Predicted and observed event yields as a function of MET for high pT leptons
ObsPred_MET2_lin.png Figure 11 : Predicted and observed event yields as a function of MET for high pT leptons
ObsPred_HT80MET30.png Figure 12 : Comparison of predicted and observed yields in the baseline selection of HT > 80 GeV, MET > 30 GeV for high pT leptons
ObsPred_HT80MET120.png Figure 13 : Comparison of predicted and observed yields in the baseline selection of HT > 80 GeV, MET > 120 GeV for high pT leptons
ObsPred_HT450MET0.png Figure 14 : Comparison of predicted and observed yields in the baseline selection of HT > 450 GeV, MET > 0 GeV for high pT leptons
ObsPred_HT450MET50.png Figure 15 : Comparison of predicted and observed yields in the baseline selection of HT > 450 GeV, MET > 50 GeV for high pT leptons
ObsPred_HT450MET120.png Figure 16 : Comparison of predicted and observed yields in the baseline selection of HT > 450 GeV, MET > 120 GeV for high pT leptons
flipRate.png Figure 17 : Charge misreconstruction probability for electrons projected on eta measured in simulated events
leptonEfficiency_lm6.png Figure 18 : Lepton selection efficiency as a function of pT , estimated in simulation for the LM6 SUSY benchmark point and corrected for simulation-to-data scale factors, for electrons and muons
tauEfficiency.png Figure 19 : Lepton selection efficiency as a function of pT , estimated in simulation for the LM6 SUSY benchmark point and corrected for simulation-to-data scale factors, for taus
metTurnOnCurve_lm6.png Figure 20 : Efficiency for an event to pass a given reconstructed MET threshold as a function of generator level MET
HTturnOnCurve_lm1.png Figure 21 : Efficiency for an event to pass a given reconstructed HT threshold as a function of generator level HT
ElectronMuonRelIsoFactorization_HT200.png Figure 22 : Efficiency of the isolation requirement as a function of the cut value in electron muon final state
DiElectronRelIsoFactorization_HT200.png Figure 23 : Efficiency of the isolation requirement as a function of the cut value in di-electron final state
DiMuonRelIsoFactorization_HT200.png Figure 24 : Efficiency of the isolation requirement as a function of the cut value in di-muon final state
RelIsoMETFactorization.png Figure 25 : Efficiency of the isolation requirement (< 0.15) as a function of the cut value on MET for muons (red) and electrons (blue)
RelIso_ElectronBtagProbe.png Figure 26 : Isolation templates for electrons used for the prediction of single-fake lepton backgrounds in the Btag-and-Probe method
RelIso_MuonBtagProbe.png Figure 27 : Isolation templates for muons used for the prediction of single-fake lepton backgrounds in the Btag-and-Probe method
Baseline_HighPt_UF.png Figure 28 : Comparison of predicted and observed yields in the baseline selection of HT > 80 GeV, MET > 30 GeV for high pT leptons
Baseline_LowPt_UF.png Figure 29 : Comparison of predicted and observed yields in the baseline selection of HT > 200 GeV, MET > 30 GeV for low pT leptons

-- SanjayPadhi - 25-Feb-2012

Topic attachments
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PDFpdf Baseline_HighPt_UF.pdf r1 manage 14.3 K 2012-06-12 - 08:10 SanjayPadhi  
PNGpng Baseline_HighPt_UF.png r1 manage 42.2 K 2012-06-12 - 08:10 SanjayPadhi  
PDFpdf Baseline_LowPt_UF.pdf r1 manage 14.2 K 2012-06-12 - 08:10 SanjayPadhi  
PNGpng Baseline_LowPt_UF.png r1 manage 40.7 K 2012-06-12 - 08:10 SanjayPadhi  
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PNGpng DiElectronRelIsoFactorization_HT200.png r1 manage 48.4 K 2012-06-09 - 16:30 SanjayPadhi  
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PNGpng DiMuonRelIsoFactorization_HT200.png r1 manage 52.1 K 2012-06-09 - 16:30 SanjayPadhi  
PDFpdf ElectronMuonRelIsoFactorization_HT200.pdf r1 manage 21.0 K 2012-06-09 - 16:30 SanjayPadhi  
PNGpng ElectronMuonRelIsoFactorization_HT200.png r1 manage 54.8 K 2012-06-09 - 16:30 SanjayPadhi  
PDFpdf FRatio_Electrons_Eta.pdf r1 manage 13.9 K 2012-06-09 - 09:36 SanjayPadhi  
PNGpng FRatio_Electrons_Eta.png r1 manage 22.6 K 2012-06-09 - 09:36 SanjayPadhi  
PDFpdf FRatio_Electrons_Pt.pdf r1 manage 14.3 K 2012-06-09 - 09:36 SanjayPadhi  
PNGpng FRatio_Electrons_Pt.png r1 manage 25.1 K 2012-06-09 - 09:36 SanjayPadhi  
PDFpdf FRatio_Muons_Eta.pdf r1 manage 13.8 K 2012-06-09 - 09:41 SanjayPadhi  
PNGpng FRatio_Muons_Eta.png r1 manage 22.4 K 2012-06-09 - 09:43 SanjayPadhi  
PDFpdf FRatio_Muons_Pt.pdf r1 manage 14.3 K 2012-06-09 - 09:43 SanjayPadhi  
PNGpng FRatio_Muons_Pt.png r1 manage 24.8 K 2012-06-09 - 09:43 SanjayPadhi  
PDFpdf HTturnOnCurve_lm1.pdf r1 manage 17.1 K 2012-06-09 - 10:45 SanjayPadhi  
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PNGpng ObsPred_HT1_lin.png r1 manage 35.8 K 2012-06-09 - 09:43 SanjayPadhi  
PDFpdf ObsPred_HT200MET120.pdf r1 manage 14.2 K 2012-06-09 - 09:45 SanjayPadhi  
PNGpng ObsPred_HT200MET120.png r1 manage 56.2 K 2012-06-09 - 09:45 SanjayPadhi  
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PNGpng ObsPred_HT2_lin.png r1 manage 43.7 K 2012-06-09 - 09:43 SanjayPadhi  
PDFpdf ObsPred_HT450MET0.pdf r1 manage 14.2 K 2012-06-09 - 09:45 SanjayPadhi  
PNGpng ObsPred_HT450MET0.png r1 manage 54.4 K 2012-06-09 - 09:45 SanjayPadhi  
PDFpdf ObsPred_HT450MET120.pdf r1 manage 13.9 K 2012-06-09 - 10:25 SanjayPadhi  
PNGpng ObsPred_HT450MET120.png r1 manage 61.0 K 2012-06-09 - 10:25 SanjayPadhi  
PDFpdf ObsPred_HT450MET50.pdf r1 manage 13.9 K 2012-06-09 - 10:25 SanjayPadhi  
PNGpng ObsPred_HT450MET50.png r1 manage 58.1 K 2012-06-09 - 10:25 SanjayPadhi  
PDFpdf ObsPred_HT80MET120.pdf r1 manage 14.0 K 2012-06-09 - 09:43 SanjayPadhi  
PNGpng ObsPred_HT80MET120.png r1 manage 52.2 K 2012-06-09 - 09:45 SanjayPadhi  
PDFpdf ObsPred_HT80MET30.pdf r1 manage 13.9 K 2012-06-09 - 09:43 SanjayPadhi  
PNGpng ObsPred_HT80MET30.png r1 manage 58.3 K 2012-06-09 - 09:43 SanjayPadhi  
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PNGpng ObsPred_MET2_lin.png r1 manage 44.1 K 2012-06-09 - 09:45 SanjayPadhi  
PDFpdf PRatio_Electrons_Pt.pdf r1 manage 13.9 K 2012-06-09 - 09:45 SanjayPadhi  
PNGpng PRatio_Electrons_Pt.png r1 manage 21.5 K 2012-06-09 - 09:46 SanjayPadhi  
PDFpdf PRatio_Muons_Pt.pdf r1 manage 13.9 K 2012-06-09 - 09:46 SanjayPadhi  
PNGpng PRatio_Muons_Pt.png r1 manage 21.6 K 2012-06-09 - 09:46 SanjayPadhi  
PDFpdf RelIsoMETFactorization.pdf r1 manage 21.1 K 2012-06-09 - 16:30 SanjayPadhi  
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PDFpdf RelIso_ElectronBtagProbe.pdf r1 manage 18.0 K 2012-06-12 - 08:10 SanjayPadhi  
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PDFpdf RelIso_MuonBtagProbe.pdf r1 manage 18.3 K 2012-06-12 - 08:10 SanjayPadhi  
PNGpng RelIso_MuonBtagProbe.png r1 manage 46.6 K 2012-06-12 - 08:10 SanjayPadhi  
PNGpng Table1.png r1 manage 66.7 K 2012-06-09 - 09:13 SanjayPadhi  
PDFpdf fig1.pdf r1 manage 23.6 K 2012-06-09 - 09:14 SanjayPadhi  
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PDFpdf flipRate.pdf r1 manage 14.8 K 2012-06-09 - 10:45 SanjayPadhi  
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