Search for supersymmetry in pp collisions at a center-of-mass energy of 8 TeV in events with two opposite sign leptons, large number of jets, b-tagged jets, and large missing transverse energy

Abstract : Results are reported from a search for new physics in pp collisions at \sqrt{s} = 8 TeV using a dataset corresponding to a total integrated luminosity of 19.7 fb^{-1} collected with the CMS experiment. Events with two opposite sign leptons, a large number of jets, b-tagged jets, and large missing transverse energy are used to search for new physics resulting in multiple top quarks and missing transverse energy in the final state. An entirely data-driven technique is used to estimate the standard model background, and the results are interpreted in the context of a sypersymmetric model in which pair produced gluinos decay to a pair of top quarks and a neutralino.

Further information

This analysis is documented in CMS-PAS-SUS-13-016. The Table and Figure numbers in this twiki correspond to the table and figure numbers in the PAS.

Figure Abbreviated Caption
Figure1 : Discriminating variables used for signal selection for SM events (red histograms) and SMS T1tttt events (black histograms): Number of jets.
Figure1 : Discriminating variables used for signal selection for SM events (red histograms) and SMS T1tttt events (black histograms) : Number of b-tagged jets.
Figure1 : Discriminating variables used for signal selection for SM events (red histograms) and SMS T1tttt events (black histograms) : \eta of leading jet.
Figure1 : Discriminating variables used for signal selection for SM events (red histograms) and SMS T1tttt events (black histograms) : \eta of sub-leading jet.
Figure1 : Discriminating variables used for signal selection for SM events (red histograms) and SMS T1tttt events (black histograms) : Missing transverse energy
Figure2 : Extrapolation factors $R_{ext.}$ as a function of missing transverse energy for the search region (red), defined as the one with number of b-tagged jets greater than two, and for the events with two b-tagged jets
Figure 3 : Extrapolation factors $R_{ext.}$ for the cross check region as a function of missing transverse energy for the search region (red) defined as the one with number of b-tagged jets greater than two, and the events with two (black) b-tagged jets
Figure 4 : Comparison between predicted (red bands) and observed (black points) missing transeverse energy distributions, along withtheir ratios, for simulated events in the cross check region.
Figure 4 : Comparison between predicted (red bands) and observed (black points) missing transverse energy distributions, along with their ratios, for simulated events in the search region.
Figure 4 : Comparison between predicted (red bands) and observed (black points) missing transeverse energy distributions, along with their ratios, for data events in the cross check region.
Figure 5 : Comparison between predicted (red bands) and observed (black points) \ETslash distributions for data events in the signal region.

Figure 6 : The 95 % CL exclusion limits on the simplified model scenarios. The 95 % CL upper observed cross section limit is shown for different gluino and LSP masses. The final results (exclusion limits) can be found in the .C file containing limit curves and the 95% CL observed cross section, and in the .root file containing the same information, along with a README file with the description of its contents.

The Acceptance x Efficiency on the simplified model scenarios. The 2D histogram can be found in the .root file.
Table 1 : Selection criteria for the definition of signal region
Table 2 : Number of signal and background (bkg.) events predicted by simulation after the event selection criteria of two opposite-sign leptons and  > 2 jets, and after the signal selection criteria are applied. The uncertainties quoted are statistical only.
Table 3 : Definitions of control and signal regions of the data samples used in the analysis.
Table 4 : Definition of the cross check region (CCR)
Table 5 : Predicted and observed number of SM background events in the signal region of the search and cross check regions.
Table 6 : Number of predicted and observed events in the signal region of the search region for an integrated luminosity of 19.7 fb^-1. The 95 % Upper Limits (UL) are also shown.
Table 7 : Signal selection efficiency systematic uncertainties

The final results (exclusion limits) can be found in the .C file containing limit curves and the 95% CL observed cross section

Additional material to aid reinterpretations of these results

Cut flow table for the m(gluino) = 1150 GeV, m(LSP) = 300 GeV benchmark point. The first row in the table shows the remaining number of events after applying the preselection as described in the CMS-PAS-SUS-13-016. Each subsequent row shows the number of events remaining after adding the selection described in that row to those listed previously.

Cut flow table for the m(gluino) = 1150 GeV, m(LSP) = 500 GeV benchmark point. The first row in the table shows the remaining number of events after applying the preselection as described in the CMS-PAS-SUS-13-016. Each subsequent row shows the number of events remaining after adding the selection described in that row to those listed previously.
Topic attachments
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PDFpdf ACC_N4B2Y1_Madb_smoothnew_mad3fg.pdf r1 manage 31.2 K 2013-10-28 - 09:50 NikiSaoulidou  
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Unknown file formatroot Acceptance_OS_T1tttt.root r1 manage 6.4 K 2013-10-28 - 09:50 NikiSaoulidou  
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PDFpdf RPRED_CLOSURE_CROSS_MC_2fb.pdf r1 manage 15.0 K 2013-10-18 - 13:29 NikiSaoulidou  
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C source code filec Results_SUS13016.C r1 manage 40.9 K 2013-10-30 - 17:55 EvaHalkiadakis  
Unknown file formatroot Results_SUS13016.root r1 manage 13.2 K 2013-10-30 - 09:46 NikiSaoulidou  
GIFgif SUS-13-016_Benchmarkpoint1.gif r1 manage 7.3 K 2014-05-17 - 18:52 KeithUlmer  
GIFgif SUS-13-016_Benchmarkpoint2.gif r1 manage 7.3 K 2014-05-17 - 18:52 KeithUlmer  
PDFpdf Table1.pdf r2 r1 manage 20.4 K 2013-10-28 - 09:45 NikiSaoulidou  
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