Searches for supersymmetry based on events with b jets and four W bosons in pp collisions at 8 CMS.TeV (SUS-14-010)

Further information

This analysis is documented in CERN CDS and arXiv:1412.4109.

The Table and Figure numbers in this twiki correspond to the table and figure numbers in the document.

Abstract

Five mutually exclusive searches for supersymmetry are presented based on events in which b jets and four W bosons are produced in proton-proton collisions at sqrt{s}=8 CMS.TeV. The data, corresponding to an integrated luminosity of 19.5 fb^-1, were collected with the CMS experiment at the CERN LHC in 2012. The five studies differ in the leptonic signature from the W boson decays, and correspond to all-hadronic, single-lepton, opposite-sign dilepton, same-sign dilepton, and >= 3 lepton final states. The results of the five studies are combined to yield 95% confidence level exclusions of 1280 and 570 CMS.GeV for the gluino and bottom-squark masses in the context of gluino and bottom-squark pair production, respectively. These limits are around 50 CMS.GeV more stringent than are obtained from any of the individual channels.

Approved tables and plots ( click on plot to get larger version )

(pseudo) Feynman diagrams

Figure Caption
T1tttt.png Figure 1a : Feynman diagrams for the signals from gluino pair production with intermediate virtual top squarks (T1tttt).
T5tttt.png Figure 1b : Feynman diagrams for the signals from gluino pair production with intermediate on-shell top squarks (T5tttt).
T6ttWW.png Figure 1c : Feynman diagrams for the signals from bottom squark pair production (T6ttWW).

Opposite-sign dilepton analysis: tables with selection criteria and observed and predicted yields

Caption Table
Table 1 : Selection criteria for the signal region in the opposite-sign dilepton analysis. table1.png
Table 2 : Predicted SM background and observed data yields as a function of MET for the opposite-sign dilepton analysis. The uncertainties in the total background predictions include both the statistical and the systematic components. table2.png

Opposite-sign dilepton analysis: plots for background prediction method

Figure Caption
EXT_FACTORS_N4Y1_pas.png Figure 2 : Extrapolation factors from the control region to the signal region, Rext, as a function of MET, for simulated events with N(b-jets)=2 (black triangles) and N(b-jets)>=3 (red points). All the other signal selection criteria have been applied. The lower panel shows the ratio of the N(b-jets)>=3 to the N(b-jets)=2 results.
RPRED_CLOSURE_CROSS_MC_2fb.png Figure 3a : MET distribution predicted for SM backgrounds by extrapolation from the control region (red bands), compared to actual distribution (black points) for simulated events in the cross-check region. The lower panel shows the ratio of the actual to predicted distribution.
RPRED_RATIO_CLOSURE_CROSS_DATA_2fb.png Figure 3b : MET distribution predicted for SM backgrounds by extrapolation from the control region (red bands), compared to actual distribution (black points) for data events in the cross-check region. The lower panel shows the ratio of the actual to predicted distribution.
RPRED_CLOSURE_MC_2fb.png Figure 3c : MET distribution predicted for SM backgrounds by extrapolation from the control region (red bands), compared to actual distribution (black points) for simulated events in the search region. The lower panel shows the ratio of the actual to predicted distribution.

Opposite-sign dilepton analysis: final result plots

Figure Caption
PRED_RATIO_CLOSURE_DATA_2fb.png Figure 4 : MET distribution in the signal region (black points) compared to the SM background prediction (red bands). The expected signal for the T1tttt model with a gluino mass of 1150 CMS.GeV and an LSP mass of 300 CMS.GeV, multiplied by a factor of 3 for better visibility, is indicated by the blue curve.

Systematic uncertainties

Caption Table
Table 3 : Relative (%) systematic uncertainties in the signal efficiency of the T1tttt model for the fully hadronic (0l), single-lepton (1l), opposite-sign dilepton (2 OS l), same-sign dilepton (2 SS l), and multilepton (>=3l) analyses. The given ranges reflect the variation across the different search regions and for different values of the SUSY particle masses. table3.png

Full combination: interpretation results

Figure Caption
T1CombXSEC.png Figure 5a : The 95% CL cross section upper limits for gluino-mediated squark production with virtual top squarks, based on an NLO+NLL reference cross section for gluino pair production. The solid and dashed lines indicate, respectively, the observed and expected exclusion contours for the combination of the five analyses. The thin contours indicate the +/- 1 standard deviation regions. (b) Exclusion contours for the individual searches, plus the combination.
T1ttttexclusion_2D.png Figure 5b : The 95% CL cross section upper limits for gluino-mediated squark production with virtual top squarks, based on an NLO+NLL reference cross section for gluino pair production. The solid and dashed lines indicate, respectively, the observed and expected exclusion contours for the combination of the five analyses. The thin contours indicate the +/- 1 standard deviation regions. (b) Exclusion contours for the individual searches, plus the combination.
T5CombXSEC.png Figure 6a : The 95% CL cross section upper limits for gluino-mediated squark production with on-shell top squarks, assuming an LSP mass of 50 CMS.GeV, based on an NLO+NLL reference cross section for gluino pair production. The solid and dashed lines indicate, respectively, the observed and expected exclusion contours for the combination of the five analyses. The thin contours indicate the +/- 1 standard deviation regions. (b) Exclusion contours for the individual searches, plus the combination.
T5ttttexclusion_2D.png Figure 6b : The 95% CL cross section upper limits for gluino-mediated squark production with on-shell top squarks, assuming an LSP mass of 50 CMS.GeV, based on an NLO+NLL reference cross section for gluino pair production. The solid and dashed lines indicate, respectively, the observed and expected exclusion contours for the combination of the five analyses. The thin contours indicate the +/- 1 standard deviation regions. (b) Exclusion contours for the individual searches, plus the combination.
T6ttWWCombXSEC.png Figure 7a : The 95% CL cross section upper limits for bottom-squark pair production, assuming an LSP mass of 50 CMS.GeV, based on an NLO+NLL reference cross section. The solid and dashed lines indicate, respectively, the observed and expected exclusion contours for the combination of the fully hadronic, same-sign dilepton, and multilepton analyses. The thin contours indicate the +/- 1 standard deviation regions. (b) Exclusion contours for the individual searches, plus the combination, assuming a bottom squark mass of 600 CMS.GeV.
T6ttWW_1Dexclusion_sbottom_600_all3.png Figure 7b : (a) The 95% CL cross section upper limits for bottom-squark pair production, assuming an LSP mass of 50 CMS.GeV, based on an NLO+NLL reference cross section. The solid and dashed lines indicate, respectively, the observed and expected exclusion contours for the combination of the fully hadronic, same-sign dilepton, and multilepton analyses. The thin contours indicate the +/- 1 standard deviation regions. (b) Exclusion contours for the individual searches, plus the combination, assuming a bottom squark mass of 600 CMS.GeV.

Opposite-sign dilepton analysis: interpretation results

Figure Caption
T12lOSXSEC.png Figure 8a : The 95% CL cross section upper limits for gluino-mediated squark production with virtual top squarks, based on an NLO+NLL reference cross section for gluino pair production, derived from the opposite-sign dilepton analysis. The solid and dashed lines indicate, respectively, the observed and expected exclusion contours. The thin contours indicate the $\pm$1 standard deviation regions.
T52lOSXSEC.png Figure 8b : The 95% CL cross section upper limits for gluino-mediated squark production with on-shell top squarks, based on an NLO+NLL reference cross section for gluino pair production, derived from the opposite-sign dilepton analysis. The solid and dashed lines indicate, respectively, the observed and expected exclusion contours. The thin contours indicate the $\pm$1 standard deviation regions.

Additional material ( click on plot to get larger version )

Cut-flow tables for OS dilepton analysis

Table Caption
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.

Full combination: 1D and 2D interpretation plots

Figure Caption
T1tttt_1Dexclusion_LSP_0.png Additional Figure 9 : The observed (expected) exclusion contours are shown in the solid (dashed) curves for the contributing analyses for the different lepton multiplicities and the final combination for gluino-mediated stop production with virtual stops. The LSP mass is fixed at 0 CMS.GeV.
T1tttt_1Dexclusion_gluino_1150.png Additional Figure 10 : The observed (expected) exclusion contours are shown in the solid (dashed) curves for the contributing analyses for the different lepton multiplicities and the final combination for gluino-mediated stop production with virtual stops. The gluino mass is fixed at 1150 CMS.GeV.
T5tttt_1Dexclusion_stop_225.png Additional Figure 9 : The observed (expected) exclusion contours are shown in the solid (dashed) curves for the contributing analyses for the different lepton multiplicities and the final combination for gluino-mediated stop production with on-shell stops. The stop mass is fixed at 225 CMS.GeV.
T5tttt_1Dexclusion_gluino_1150.png Additional Figure 10 : The observed (expected) exclusion contours are shown in the solid (dashed) curves for the contributing analyses for the different lepton multiplicities and the final combination for gluino-mediated stop production with on-shell stops. The gluino mass is fixed at 1150 CMS.GeV.
T6ttWW_1Dexclusion_LSP_100_all3.png Additional Figure 13 : The observed (expected) exclusion contours are shown in the solid (dashed) curves for the contributing analyses for the different lepton multiplicities and the final combination for sbottom pair production followed by the decay of the sbottom to a chargino and a top quark. The chargino then decays to a W boson and a neutralino. The chargino mass is fixed at 100 CMS.GeV.
T6ttWW_2Dexclusion.png Additional Figure 14 : The observed (expected) exclusion contours are shown in the solid (dashed) curves for the contributing analyses for the different lepton multiplicities and the final combination for sbottom pair production followed by the decay of the sbottom to a chargino and a top quark. The chargino then decays to a W boson and a neutralino.

Electronic format of exclusion plots

Root File Caption
T1tttt combination Observed and expected 95% cross section times branching fraction upper limits for the T1tttt simplified model, together with the exclusion curves and the uncertainty bands.
T1tttt OS dilepton results Observed and expected 95% cross section times branching fraction upper limits for the T1tttt simplified model in the OS dilepton analysis, together with the exclusion curves and the uncertainty bands.
T5tttt combination Observed and expected 95% cross section times branching fraction upper limits for the T1tttt simplified model, together with the exclusion curves and the uncertainty bands.
T5tttt OS dilepton results Observed and expected 95% cross section times branching fraction upper limits for the T1tttt simplified model in the OS dilepton analysis, together with the exclusion curves and the uncertainty bands.
T6ttWW combination Observed and expected 95% cross section times branching fraction upper limits for the T6ttWW simplified model, together with the exclusion curves and the uncertainty bands.

-- PieterEveraerts - 14 Aug 2014

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