Searches for Supersymmetry using Multilepton Signatures in pp Collisions at 7 TeV

Abstract

A search for physics beyond the standard model using events with at least three leptons is presented. The data sample corresponds to 2.1 fb-1 of integrated luminosity in pp collisions at √s=7 TeV collected by the CMS experiment at the LHC. Standard model backgrounds are suppressed by requiring missing transverse energy, invariant mass of lepton pairs inconsistent with that of the Z boson, or high jet activity. Control samples in data are used to ascertain the robustness of background evaluation techniques and to minimize the reliance on simulation. The observations are mostly consistent with expectations from standard model processes. These results are used to exclude previously unexplored regions of the supersymmetric parameter space assuming R-parity conservation with the lightest supersymmetric particle being either a neutralino or gravitino.

Approved Plots from SUS-11-013. See also 5 fb-1 update at https://twiki.cern.ch/twiki/bin/view/CMSPublic/PhysicsResultsEXO11045SUS11013Prelim (Click on blue names in the right column to download files)

Figure Abbreviated Caption
f2a_Crop.png Average HT in CMSSM plane for fixed tan beta = 3 and A0 = 0
f2b_Crop.png Average MET in CMSSM plane for fixed tan beta = 3 and A0 = 0
n-Figure_001a.png Example HT distribution for SM backgrounds and two models
n-Figure_001b.png Example MET distribution for SM backgrounds and two models
DY_lle_HT_cor_log_Crop.png HT for lle where two leptons (ll) are isolated but the third lepton is required to be non-isolated
DY_lle_MET_cor_log_Crop.png MET for lle where two leptons (ll) are isolated but the third lepton is required to be non-isolated
DY_llu_HT_cor_log_Crop.png HT for llmu where two leptons (ll) are isolated but the third lepton is required to be non-isolated
DY_llu_MET_cor_log_Crop.png MET for llmu where two leptons (ll) are isolated but the third lepton is required to be non-isolated
n-SRAttbarjetElUNBIASED_relIso_Crop.png Isolation Distribution of electrons with large impact parameter (>0.02 cm, primarily from jets)
n-SRAttbarjetMuUNBIASED_relIso_Crop.png Isolation Distribution of muons with large impact parameter (>0.02 cm, primarily from jets)
m-n-dd_fsrel_plotZV_Crop.png Trilepton invariant mass distribution after all other selections for channel.
m-n-dd_fsr_plotZV_Crop.png Trilepton invariant mass distribution after all other selections for channel.
m-n-dd_SUSY_ht_plot_Crop.png HT distribution for three-lepton events passing all selectrion criteria, except MET. Z decays included.
m-n-dd_SUSY_ht_plotZV_Crop.png HT distribution for three-lepton events passing all selectrion criteria, except MET. Z-veto applied.
m-n-dd_SUSY_met_plot_Crop.png MET distribution for three-lepton events passing all selectrion criteria, except HT. Z decays included.
m-n-dd_SUSY_met_plotZV_Crop.png MET distribution for three-lepton events passing all selectrion criteria, except HT. Z-veto applied.
n-dd_SUSY_njets_plot_Crop.png Jet multiplicity distribution for three-lepton events passing all selection criteria. Z decays included.
n-dd_SUSY_njets_plotZV_Crop.png Jet multiplicity distribution for three-lepton events passing all selection criteria. Z-veto applied.
n-L3T0_DD_RA7_Crop.png Background breakdown: 3-lepton (0 Taus) Channels
n-L3T1_DD_RA7_Crop.png Background breakdown: 3-lepton (1 Tau) Channels
n-L3T2_DD_RA7_Crop.png Background breakdown: 3-lepton (2 Taus) Channels
n-L4T0_DD_RA7_Crop.png Background breakdown: 4-lepton (0 Taus) Channels
n-L4T1_DD_RA7_Crop.png Background breakdown: 4-lepton (1 Tau) Channels
n-L4T2_DD_RA7_Crop.png Background breakdown: 4-lepton (2 Taus) Channels
VVJets_mlll_lle_offZ_Crop.png Trilepton invariant mass distribution after a Z veto for OSSF dilepton pairs: channels
VVJets_mlll_llm_offZ_Crop.png Trilepton invariant mass distribution after a Z veto for OSSF dilepton pairs: channels
n-ExclusionLimit_coNLSP_Crop.png Exclusion region in the gluino mass versus wino-like chargino mass plane for the slepton co-NLSP scenario. The region below the red line (observed limit) is excluded at 95% confidence level.
n-ExclusionLimit_tanb3_Crop.png Excluded regions for the CMSSM scenarios with tan beta = 3. Value of m0, m1/2 below the red curve (observed limit) are excluded by this analysis.
n-ExclusionLimit_tanb10_Crop.png Excluded regions for the CMSSM scenarios with tan beta = 10. Value of m0, m1/2 below the red curve (observed limit) are excluded by this analysis.

Link to SUS-11-013 PAS in CDS

-- SanjayArora - 20-Oct-2011

Topic attachments
I Attachment History Action Size Date Who Comment
PNGpng DY_lle_HT_cor_log_Crop.png r1 manage 31.1 K 2011-10-25 - 03:20 SanjayArora  
PNGpng DY_lle_MET_cor_log_Crop.png r1 manage 32.6 K 2011-10-25 - 03:21 SanjayArora  
PNGpng DY_llu_HT_cor_log_Crop.png r1 manage 31.7 K 2011-10-25 - 03:21 SanjayArora  
PNGpng DY_llu_MET_cor_log_Crop.png r1 manage 34.4 K 2011-10-25 - 03:21 SanjayArora  
PDFpdf SUS-11-013-pas-v20.pdf r1 manage 830.5 K 2011-10-20 - 18:41 SanjayArora SUSY PAS v20
PNGpng VVJets_mlll_lle_offZ_Crop.png r1 manage 33.5 K 2011-10-25 - 03:22 SanjayArora  
PNGpng VVJets_mlll_llm_offZ_Crop.png r1 manage 35.2 K 2011-10-25 - 03:22 SanjayArora  
JPEGjpeg f1.jpeg r1 manage 7.3 K 2011-10-20 - 16:45 SanjayArora  
PNGpng f2a_Crop.png r1 manage 29.7 K 2011-10-25 - 03:21 SanjayArora  
PNGpng f2b_Crop.png r1 manage 28.2 K 2011-10-25 - 03:21 SanjayArora  
PNGpng m-n-dd_SUSY_ht_plotZV_Crop.png r1 manage 35.9 K 2011-10-25 - 19:49 SanjayArora  
PNGpng m-n-dd_SUSY_ht_plot_Crop.png r1 manage 39.3 K 2011-10-25 - 19:48 SanjayArora  
PNGpng m-n-dd_SUSY_met_plotZV_Crop.png r1 manage 43.4 K 2011-10-25 - 19:49 SanjayArora  
PNGpng m-n-dd_SUSY_met_plot_Crop.png r1 manage 44.9 K 2011-10-25 - 19:49 SanjayArora  
PNGpng m-n-dd_fsr_plotZV_Crop.png r1 manage 37.6 K 2011-10-25 - 19:48 SanjayArora  
PNGpng m-n-dd_fsrel_plotZV_Crop.png r1 manage 41.0 K 2011-10-25 - 19:48 SanjayArora  
PDFpdf n-DY_lle_HT_cor_log.pdf r2 r1 manage 17.3 K 2011-10-25 - 03:00 SanjayArora HT for lle where two leptons (ll) are isolated but the third lepton is required to be non-isolated
PNGpng n-DY_lle_HT_cor_log_Crop.png r1 manage 31.1 K 2011-10-25 - 03:14 SanjayArora  
PDFpdf n-DY_lle_MET_cor_log.pdf r2 r1 manage 20.5 K 2011-10-25 - 03:01 SanjayArora MET for lle where two leptons (ll) are isolated but the third lepton is required to be non-isolated
PNGpng n-DY_lle_MET_cor_log_Crop.png r1 manage 32.6 K 2011-10-25 - 03:15 SanjayArora  
PDFpdf n-DY_llu_HT_cor_log.pdf r2 r1 manage 17.6 K 2011-10-25 - 03:02 SanjayArora HT for llmu where two leptons (ll) are isolated but the third lepton is required to be non-isolated
PNGpng n-DY_llu_HT_cor_log_Crop.png r1 manage 31.7 K 2011-10-25 - 03:15 SanjayArora  
PDFpdf n-DY_llu_MET_cor_log.pdf r2 r1 manage 21.2 K 2011-10-25 - 03:03 SanjayArora MET for llmu where two leptons (ll) are isolated but the third lepton is required to be non-isolated
PNGpng n-DY_llu_MET_cor_log_Crop.png r1 manage 34.4 K 2011-10-25 - 03:15 SanjayArora  
PDFpdf n-ExclusionLimit_coNLSP.pdf r1 manage 14.8 K 2011-10-21 - 00:17 SanjayArora Exclusion region in the gluino mass versus wino-like chargino mass plane for the slepton co-NLSP scenario. The region below the red line (observed limit) is excluded at 95% confidence level.
PNGpng n-ExclusionLimit_coNLSP_Crop.png r1 manage 35.5 K 2011-10-21 - 00:15 SanjayArora  
PDFpdf n-ExclusionLimit_tanb10.pdf r1 manage 21.3 K 2011-10-21 - 00:25 SanjayArora Excluded regions for the CMSSM scenarios with tan beta = 10. Value of m0, m1/2 below the red curve (observed limit) are excluded by this analysis.
PNGpng n-ExclusionLimit_tanb10_Crop.png r1 manage 55.6 K 2011-10-21 - 00:15 SanjayArora  
PDFpdf n-ExclusionLimit_tanb3.pdf r1 manage 20.7 K 2011-10-21 - 00:24 SanjayArora Excluded regions for the CMSSM scenarios with tan beta = 3. Value of m0, m1/2 below the red curve (observed limit) are excluded by this analysis.
PNGpng n-ExclusionLimit_tanb3_Crop.png r1 manage 54.5 K 2011-10-21 - 00:15 SanjayArora  
PDFpdf n-Figure_001a.pdf r1 manage 14.9 K 2011-10-22 - 03:07 Somalwar  
PNGpng n-Figure_001a.png r1 manage 27.8 K 2011-10-22 - 03:08 Somalwar  
PDFpdf n-Figure_001b.pdf r1 manage 14.7 K 2011-10-22 - 03:08 Somalwar  
PNGpng n-Figure_001b.png r1 manage 27.7 K 2011-10-22 - 03:09 Somalwar  
PDFpdf n-L3T0_DD_RA7.pdf r1 manage 16.9 K 2011-10-20 - 18:14 SanjayArora Background breakdown: 3-lepton (0 Taus) Channels
PNGpng n-L3T0_DD_RA7_Crop.png r1 manage 21.3 K 2011-10-20 - 21:27 SanjayArora  
PDFpdf n-L3T1_DD_RA7.pdf r1 manage 16.8 K 2011-10-20 - 18:14 SanjayArora Background breakdown: 3-lepton (1 Tau) Channels
PNGpng n-L3T1_DD_RA7_Crop.png r1 manage 20.1 K 2011-10-20 - 21:27 SanjayArora  
PDFpdf n-L3T2_DD_RA7.pdf r1 manage 15.3 K 2011-10-20 - 18:15 SanjayArora Background breakdown: 3-lepton (2 Taus) Channels
PNGpng n-L3T2_DD_RA7_Crop.png r1 manage 16.5 K 2011-10-20 - 21:27 SanjayArora  
PDFpdf n-L4T0_DD_RA7.pdf r1 manage 15.2 K 2011-10-20 - 18:16 SanjayArora Background breakdown: 4-lepton (0 Taus) Channels
PNGpng n-L4T0_DD_RA7_Crop.png r1 manage 18.1 K 2011-10-20 - 21:28 SanjayArora  
PDFpdf n-L4T1_DD_RA7.pdf r1 manage 15.1 K 2011-10-20 - 18:16 SanjayArora Background breakdown: 4-lepton (1 Tau) Channels
PNGpng n-L4T1_DD_RA7_Crop.png r1 manage 18.5 K 2011-10-20 - 21:28 SanjayArora  
PDFpdf n-L4T2_DD_RA7.pdf r1 manage 15.2 K 2011-10-20 - 18:16 SanjayArora Background breakdown: 4-lepton (2 Taus) Channels
PNGpng n-L4T2_DD_RA7_Crop.png r1 manage 18.8 K 2011-10-20 - 21:28 SanjayArora  
PDFpdf n-SRAttbarjetElUNBIASED_relIso.pdf r1 manage 20.6 K 2011-10-20 - 16:56 SanjayArora Isolation Distribution of electrons with large impact parameter (>0.02 cm, primarily from jets)
PNGpng n-SRAttbarjetElUNBIASED_relIso_Crop.png r1 manage 21.9 K 2011-10-20 - 21:34 SanjayArora  
PDFpdf n-SRAttbarjetMuUNBIASED_relIso.pdf r1 manage 24.1 K 2011-10-20 - 16:57 SanjayArora Isolation Distribution of muons with large impact parameter (>0.02 cm, primarily from jets)
PNGpng n-SRAttbarjetMuUNBIASED_relIso_Crop.png r1 manage 32.5 K 2011-10-20 - 21:34 SanjayArora  
PDFpdf n-VVJets_mlll_lle_offZ.pdf r2 r1 manage 22.0 K 2011-10-25 - 03:33 SanjayArora Trilepton invariant mass distribution after a Z veto for OSSF dilepton pairs: l+ l- + e channels
PNGpng n-VVJets_mlll_lle_offZ_Crop.png r1 manage 33.5 K 2011-10-25 - 03:16 SanjayArora  
PDFpdf n-VVJets_mlll_llm_offZ.pdf r2 r1 manage 20.5 K 2011-10-25 - 03:32 SanjayArora Trilepton invariant mass distribution after a Z veto for OSSF dilepton pairs: l+ l- + mu channels
PNGpng n-VVJets_mlll_llm_offZ_Crop.png r1 manage 35.2 K 2011-10-25 - 03:16 SanjayArora  
PDFpdf n-dd_SUSY_ht_plot.pdf r2 r1 manage 15.0 K 2011-10-25 - 19:35 SanjayArora HT distribution for three-lepton events passing all selectrion criteria, except MET. Z decays included.
PDFpdf n-dd_SUSY_ht_plotZV.pdf r2 r1 manage 14.8 K 2011-10-25 - 19:35 SanjayArora HT distribution for three-lepton events passing all selectrion criteria, except MET. Z-veto applied.
PNGpng n-dd_SUSY_ht_plotZV_Crop.png r1 manage 35.8 K 2011-10-20 - 19:16 SanjayArora  
PNGpng n-dd_SUSY_ht_plot_Crop.png r1 manage 39.2 K 2011-10-20 - 19:16 SanjayArora  
PDFpdf n-dd_SUSY_met_plot.pdf r2 r1 manage 19.0 K 2011-10-25 - 19:35 SanjayArora MET distribution for three-lepton events passing all selectrion criteria, except HT. Z decays included.
PDFpdf n-dd_SUSY_met_plotZV.pdf r2 r1 manage 19.0 K 2011-10-25 - 19:36 SanjayArora MET distribution for three-lepton events passing all selectrion criteria, except HT. Z-veto applied.
PNGpng n-dd_SUSY_met_plotZV_Crop.png r1 manage 43.5 K 2011-10-20 - 19:17 SanjayArora  
PNGpng n-dd_SUSY_met_plot_Crop.png r1 manage 44.9 K 2011-10-20 - 19:17 SanjayArora  
PDFpdf n-dd_SUSY_njets_plot.pdf r1 manage 14.5 K 2011-10-20 - 18:10 SanjayArora Jet multiplicity distribution for three-lepton events passing all selection criteria. Z decays included.
PDFpdf n-dd_SUSY_njets_plotZV.pdf r1 manage 14.4 K 2011-10-20 - 18:11 SanjayArora Jet multiplicity distribution for three-lepton events passing all selection criteria. Z-veto applied.
PNGpng n-dd_SUSY_njets_plotZV_Crop.png r1 manage 31.0 K 2011-10-20 - 19:17 SanjayArora  
PNGpng n-dd_SUSY_njets_plot_Crop.png r1 manage 33.2 K 2011-10-20 - 19:17 SanjayArora  
PDFpdf n-dd_fsr_plotZV.pdf r2 r1 manage 14.5 K 2011-10-25 - 19:33 SanjayArora Trilepton invariant mass distribution after all other selections for mu mu mu channel.
PNGpng n-dd_fsr_plotZV_Crop.png r1 manage 36.6 K 2011-10-20 - 19:20 SanjayArora  
GIFgif n-dd_fsrel_plotZV.gif r1 manage 19.3 K 2011-10-20 - 18:21 SanjayArora  
JPEGjpg n-dd_fsrel_plotZV.jpg r1 manage 62.4 K 2011-10-20 - 17:01 SanjayArora  
PDFpdf n-dd_fsrel_plotZV.pdf r2 r1 manage 14.9 K 2011-10-25 - 19:33 SanjayArora Trilepton invariant mass distribution after all other selections for mu mu e channel.
PNGpng n-dd_fsrel_plotZV.png r1 manage 42.6 K 2011-10-20 - 18:21 SanjayArora  
PNGpng n-dd_fsrel_plotZV_Crop.png r1 manage 39.4 K 2011-10-20 - 19:20 SanjayArora  
PDFpdf n-f2a.pdf r2 r1 manage 21.4 K 2011-10-25 - 03:40 SanjayArora Average HT in CMSSM plane for fixed tan beta = 3 and A0 = 0
PDFpdf n-f2b.pdf r2 r1 manage 22.3 K 2011-10-25 - 03:40 SanjayArora Average MET in CMSSM plane for fixed tan beta = 3 and A0 = 0
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