Search for new physics in events with same-sign dileptons and b-tagged jets in pp collisions at sqrt(s) = 7 TeV (SUS-11-020)

Abstract

A search for new physics is performed using isolated same-sign dileptons with at least two b-quark jets in the final state. Results are based on a 4.98 inverse femtobarn sample of proton-proton collisions at a centre-of-mass energy of 7 TeV collected by the CMS detector. No excess above the standard model background is observed. Upper limits at 95% confidence level are set on the number of events from non-standard-model sources. These limits are used to set constraints on a number of new physics models. Information on acceptance and efficiencies are also provided so that the results can be used to confront additional models in an approximate way.

This analysis is published in JHEP08(2012)110.

Approved Tables and Plots ( click on plot to get larger version )

Table Abbreviated Caption
table1.png A summary of the results of 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, the event yield, and the observed 95% confidence level upper limit on the number of non-SM events ($N_{UL}$) calculated under three different assumptions for the event efficiency uncertainty. Note that the count of the number of jets on the first line of the table includes both tagged and untagged jets.
table2.png Table 2: Parameters used in describing the turn-on curves for HT and MET as a function of their generator values

Figure Abbreviated Caption
fig1a.png Figure 1a : distribution of ET vs. HT for the ten events in SR0; ee events: circles; eμ events: squares; μμ events: triangles
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
fig2a.png Figure 2a : Lepton selection efficiency (calculated for a SUSY LM9 point)
fig2b.png Figure 2b : b-tagging efficiency
fig3a.png Figure 3a : Efficiency for an event to pass a given reconstructed MET threshold as a function of generator-MET
fig3b.png Figure 3b : Efficiency for an event to pass a given reconstructed HT threshold as a function of generator-HT
fig4a.png Figure 4a : Excluded region in the parameter space of the Z' model
fig4b.png Figure 4b : Excluded region in the parameter space of the MxFV model
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 different choices of the LSP mass
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
fig9.png Figure 9a : Cross section limits on the sbottom pair-production cross-section compared with its expected value in Model B1
fig10.png Figure 9b : Gluino pair-production cross-section as a function of gluino mass compared with limits on the cross-section from the models A1, A2, and B2
ssmll.png Additional Figure : Invariant mass of Same Sign di-electron
muFR_datapt.png Additional Figure : Muon Tight-to-Loose ratio for different requirements on the PT of the away jet
eleFRnoIso_data_pt.png Additional Figure : Electron Tight-to-Loose ratio for different requirements on the PT of the away jet - Triggers with no isolation requirements
eleFRcaloIso_data_pt.png Additional Figure : Electron Tight-to-Loose ratio for different requirements on the PT of the away jet - Triggers with calorimeter isolation requirements
eleFRcaloIsoTrkIso_data_pt.png Additional Figure : Electron Tight-to-Loose ratio for different requirements on the PT of the away jet - Triggers with calorimeter and tracker isolation requirements

-- ClaudioCampagnari - 28-May-2012

Topic attachments
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PDFpdf eleFRcaloIsoTrkIso_data_pt.pdf r3 r2 r1 manage 15.4 K 2012-05-28 - 08:29 ClaudioCampagnari  
PNGpng eleFRcaloIsoTrkIso_data_pt.png r3 r2 r1 manage 13.4 K 2012-05-28 - 08:29 ClaudioCampagnari  
PDFpdf eleFRcaloIso_data_pt.pdf r3 r2 r1 manage 15.1 K 2012-05-28 - 08:29 ClaudioCampagnari  
PNGpng eleFRcaloIso_data_pt.png r3 r2 r1 manage 13.3 K 2012-05-28 - 08:29 ClaudioCampagnari  
PDFpdf eleFRnoIso_data_pt.pdf r3 r2 r1 manage 15.4 K 2012-05-28 - 08:29 ClaudioCampagnari  
PNGpng eleFRnoIso_data_pt.png r3 r2 r1 manage 13.3 K 2012-05-28 - 08:29 ClaudioCampagnari  
PDFpdf fig10.pdf r2 r1 manage 20.9 K 2012-05-28 - 07:02 ClaudioCampagnari  
PNGpng fig10.png r2 r1 manage 39.2 K 2012-05-28 - 07:02 ClaudioCampagnari  
PDFpdf fig1a.pdf r2 r1 manage 14.2 K 2012-05-28 - 06:25 ClaudioCampagnari  
PNGpng fig1a.png r2 r1 manage 28.4 K 2012-05-28 - 06:29 ClaudioCampagnari  
PDFpdf fig1b.pdf r2 r1 manage 14.0 K 2012-05-28 - 06:31 ClaudioCampagnari  
PNGpng fig1b.png r2 r1 manage 29.0 K 2012-05-28 - 06:32 ClaudioCampagnari  
PDFpdf fig1c.pdf r2 r1 manage 14.5 K 2012-05-28 - 06:32 ClaudioCampagnari  
PNGpng fig1c.png r2 r1 manage 32.4 K 2012-05-28 - 06:33 ClaudioCampagnari  
PDFpdf fig2a.pdf r1 manage 15.6 K 2012-05-28 - 06:40 ClaudioCampagnari  
PNGpng fig2a.png r1 manage 23.9 K 2012-05-28 - 06:40 ClaudioCampagnari  
PDFpdf fig2b.pdf r1 manage 14.9 K 2012-05-28 - 06:40 ClaudioCampagnari  
PNGpng fig2b.png r1 manage 22.8 K 2012-05-28 - 06:40 ClaudioCampagnari  
PDFpdf fig3a.pdf r2 r1 manage 18.5 K 2012-05-28 - 06:41 ClaudioCampagnari  
PNGpng fig3a.png r2 r1 manage 30.6 K 2012-05-28 - 06:41 ClaudioCampagnari  
PDFpdf fig3b.pdf r2 r1 manage 21.3 K 2012-05-28 - 06:41 ClaudioCampagnari  
PNGpng fig3b.png r2 r1 manage 28.6 K 2012-05-28 - 06:41 ClaudioCampagnari  
PDFpdf fig4a.pdf r2 r1 manage 18.2 K 2012-05-28 - 06:50 ClaudioCampagnari  
PNGpng fig4a.png r2 r1 manage 59.1 K 2012-05-28 - 06:50 ClaudioCampagnari  
PDFpdf fig4b.pdf r2 r1 manage 16.9 K 2012-05-28 - 06:50 ClaudioCampagnari  
PNGpng fig4b.png r2 r1 manage 41.1 K 2012-05-28 - 06:50 ClaudioCampagnari  
PDFpdf fig5a.pdf r1 manage 10.2 K 2012-03-01 - 13:15 SanjayPadhi  
PNGpng fig5a.png r1 manage 23.9 K 2012-03-01 - 13:17 SanjayPadhi  
PDFpdf fig5b.pdf r1 manage 11.8 K 2012-03-01 - 13:16 SanjayPadhi  
PNGpng fig5b.png r1 manage 21.9 K 2012-03-01 - 13:16 SanjayPadhi  
PDFpdf fig6a.pdf r2 r1 manage 15.4 K 2012-05-28 - 06:55 ClaudioCampagnari  
PNGpng fig6a.png r2 r1 manage 36.3 K 2012-05-28 - 06:55 ClaudioCampagnari  
PDFpdf fig6b.pdf r2 r1 manage 14.7 K 2012-05-28 - 06:55 ClaudioCampagnari  
PNGpng fig6b.png r2 r1 manage 35.8 K 2012-05-28 - 06:55 ClaudioCampagnari  
PDFpdf fig7a.pdf r1 manage 10.8 K 2012-03-05 - 07:36 SanjayPadhi  
PNGpng fig7a.png r1 manage 33.1 K 2012-03-05 - 07:36 SanjayPadhi  
PDFpdf fig7b.pdf r1 manage 12.5 K 2012-03-01 - 13:18 SanjayPadhi  
PNGpng fig7b.png r1 manage 20.7 K 2012-03-01 - 13:18 SanjayPadhi  
PDFpdf fig8a.pdf r2 r1 manage 14.5 K 2012-05-28 - 07:02 ClaudioCampagnari  
PNGpng fig8a.png r2 r1 manage 34.1 K 2012-05-28 - 07:02 ClaudioCampagnari  
PDFpdf fig8b.pdf r2 r1 manage 15.1 K 2012-05-28 - 07:02 ClaudioCampagnari  
PNGpng fig8b.png r2 r1 manage 38.3 K 2012-05-28 - 07:02 ClaudioCampagnari  
PDFpdf fig9.pdf r2 r1 manage 15.5 K 2012-05-28 - 07:02 ClaudioCampagnari  
PNGpng fig9.png r2 r1 manage 28.8 K 2012-05-28 - 07:02 ClaudioCampagnari  
PDFpdf muFR_datapt.pdf r3 r2 r1 manage 14.9 K 2012-05-28 - 07:18 ClaudioCampagnari  
PNGpng muFR_datapt.png r4 r3 r2 r1 manage 12.9 K 2012-05-28 - 07:18 ClaudioCampagnari  
PDFpdf ssmll.pdf r2 r1 manage 14.8 K 2012-05-28 - 07:07 ClaudioCampagnari  
PNGpng ssmll.png r2 r1 manage 10.2 K 2012-05-28 - 07:07 ClaudioCampagnari  
PNGpng table1.png r2 r1 manage 89.7 K 2012-05-28 - 06:21 ClaudioCampagnari  
PNGpng table2.png r1 manage 15.1 K 2012-03-01 - 13:21 SanjayPadhi  
PNGpng table3.png r1 manage 22.2 K 2012-03-01 - 13:21 SanjayPadhi  
PNGpng table4.png r1 manage 18.3 K 2012-03-01 - 13:21 SanjayPadhi  
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