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Search for new physics in events with same-sign dileptons and b jets in pp collisions at sqrt(s) = 8 TeV (SUS-12-029)

Abstract

A search for new physics is performed using events with isolated same-sign leptons and at least two b-quark jets in the final state. Results are based on a sample of proton-proton collisions at a center-of-mass energy of 8 TeV collected with the CMS detector and corresponding to an integrated luminosity of 10.5 fb-1. No excess above the standard model background is observed. Upper limits are set on the number of events from non-standard-model sources and are used to constrain a number of new physics models. Information on acceptance and efficiencies is also provided so that the results can be used to confront an even broader class of new physics models.

Further information

This analysis is documented in SUS-12-029.

This analysis is planned to be submitted to JHEP.

Table Abbreviated Caption
table1.png A summary of the combination of results for this search. For each signal region (SR), we show its most distinguishing kinematic requirements, the prediction for the three background (BG) components as well as the total, and the observed number of events. Note that the count of the number of jets on the first line of the table includes both tagged and untagged jets.

Figure Abbreviated Caption
fig1a.png Figure 1a : distribution of ET vs. HT for the 43 events in SR0; ee events: circles; eμ events: squares; μμ events: triangles; filled markers denote events with at least four jets; open markers denote events with at least 2, but less than 4 jets
fig1b.png Figure 1b : projection of the scatter plot on the HT axis
fig1c.png Figure 1c : projection of the scatter plot on the MET axis
fig1d.png Figure 1d : distribution of leading lepton pt of observed events and estimated backgrounds
fig1e.png Figure 1e : distribution of the trailing lepton pt of observed events and estimated backgrounds
fig1f.png Figure 1f : distribution of number of jets of observed events and estimated backgrounds
fig1g.png Figure 1g : distribution of the number of b-tagged jets of observed events and estimated backgrounds

fig2a.png Figure 2a : Lepton selection efficiency (calculated using Model A1)
fig2b.png Figure 2b : b-tagging efficiency
fig5a.png Figure 5a : Diagram for A1 model
fig5b.png Figure 5b : Diagram for A2 model
fig6a.png Figure 6a : exclusion (95 % C.L.) in the m(χ0 ) − m( g) plane for model A1 (gluino decay via virtual stop quarks). The band represents the theoretical uncertainty on the gluino pair production cross-section.
fig6b.png Figure 6b : exclusion (95 % C.L.) in the m(t1 ) − m( g) plane for model A2 (gluino decay to on-shell top squarks) for a LSP mass of 50 GeV
fig6c.png Figure 6c : exclusion (95 % C.L.) in the m(t1 ) − m( g) plane for model A2 (gluino decay to on-shell top squarks) for a LSP mass of 250 GeV
fig7b.png Figure 7a : Diagram for B1 model
fig7a.png Figure 7b : Diagram for B2 model
fig8a.png Figure 8a : exclusion (95 % C.L.) in the m(χ− ) − m(b1 ) plane for model B1 (sbottom pair production)
fig8b.png Figure 8b : exclusion (95% C.L.) in the m(b1 ) − m( g) plane for model B2 for a chargino mass of 150 GeV and a LSP mass of 50 GeV
fig8c.png Figure 8c : exclusion (95% C.L.) in the m(b1 ) − m( g) plane for model B2 for a chargino mass of 300 GeV and a LSP mass of 50 GeV
fig6d.png Additional Figure : exclusion (95 % C.L.) in the m(t1 ) − m( g) plane for model Aq (gluino decay via virtual stop quarks), alternate presentation
fig6e.png Additional Figure : exclusion (95 % C.L.) in the m(t1 ) − m( g) plane for model A2 (gluino decay to on-shell top squarks), alternate presentation
fig8d.png Additional Figure : exclusion (95 % C.L.) in the m(χ− ) − m(b1 ) plane for model B1 (sbottom pair production), alternate presentation
fig8e.png Additional Figure : exclusion (95% C.L.) in the m(b1 ) − m( g) plane for model B2, alternate presentation
fig9a.png Additional Figure : Method 1 electron Tight-to-Loose ratio projected in lepton pT for different requirements on the PT of the away jet
fig9b.png Additional Figure : Method 1 electron Tight-to-Loose ratio projected in lepton eta for different requirements on the PT of the away jet
fig9c.png Additional Figure : Method 1 electron Tight-to-Loose ratio binned in number of vertices for different requirements on the PT of the away jet
fig3a.png Additional Figure : Method 1 muon Tight-to-Loose ratio projected in lepton pT for different requirements on the PT of the away jet
fig3b.png Additional Figure : Method 1 muon Tight-to-Loose ratio projected in lepton eta for different requirements on the PT of the away jet
fig3c.png Additional Figure : Method 1 muon Tight-to-Loose ratio binned in number of vertices for different requirements on the PT of the away jet

Combined_Bar.png Additional Figure: Observed events and predicted background for each channel in a control region, defined with HT>200 GeV, MET> 200 GeV and nBjet>=0.
HT.png Additional Figure: HT distribution of the observed events and estimated backgrounds in the control region.
MET.png Additional Figure: MET distribution of the observed events and estimated backgrounds in the control region.
nBjets.png Additional Figure: distribution of the number of b-tagged jets of observed events and estimated backgrounds in the control region.
LeadingLeptonPT.png Additional Figure: pT distribution of the leading lepton for observed data and predicted background for the control region.
RelIso_Mu.png Additional Figure: Relative isolation distribution as measured in the QCD control region for Method 2 used to estimate the background from jets mis-identified as muons.
RelIso_El.png Additional Figure: Relative isolation distribution as measured in the QCD control region for Method 2 used to estimate the background from jets mis-identified as electrons.

fig4a.png Additional Figure: Signal region giving the best expected limit for Model A1.
fig4b.png Additional Figure: Signal region giving the best expected limit for Model A2 with a LSP mass of 50 GeV.
fig4c.png Additional Figure: Signal region giving the best expected limit for Model A2 with a LSP mass of 250 GeV.
fig4d.png Additional Figure: Signal region giving the best expected limit for Model B2 with a chargino mass of 150 GeV and a LSP mass of 50 GeV.
fig4e.png Additional Figure: Signal region giving the best expected limit for Model B2 with a chargino mass of 300 GeV and a LSP mass of 50 GeV.
fig4f.png Additional Figure: Signal region giving the best expected limit for Model B1.
fig10a.png Additional Figure: Acceptance for Model A1.
fig10b.png Additional Figure: Acceptance for Model A2 with a LSP mass of 50 GeV.
fig10c.png Additional Figure: Acceptance for Model A2 with a LSP mass of 250 GeV.
fig10d.png Additional Figure: Acceptance for Model B2 with a chargino mass of 150 GeV and a LSP mass of 50 GeV.
fig10e.png Additional Figure: Acceptance for Model B2 with a chargino mass of 300 GeV and a LSP mass of 50 GeV.
fig10f.png Additional Figure: Acceptance for Model B1.
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Unknown file formatext table1 r1 manage 85.0 K 2012-11-06 - 23:02 FrankGolf  
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