Search for new physics in proton-proton collisions at 7 TeV in events with a single lepton, jets, and missing transverse momentum

Work in progress, under construction currently under modification Work in progress, under construction

Abstract

Results are reported from a search for new physics beyond the Standard Model in proton-proton collisions at a center-of-mass energy = 7 TeV, focusing on the signature with a single isolated lepton, energetic jets, and large missing transverse momentum. The data sample comprises an integrated luminosity of 36.1 pb−1 recorded by the CMS experiment at the Large Hadron Collider. The presence of the lepton indicates an electroweak decay; the multiple jets can be produced in the complex decay chains of heavy objects; and the large missing momentum is associated with the presence of unobserved (weakly interacting) particles. The missing momentum can arise either from neutrino production, or, in models based on supersymmetry (SUSY), from production of the lightest supersymmetric particle. The observed number of events is consistent with Standard Model expectations based on data-driven background estimates using control samples. The results are interpreted in terms of constraints on SUSY parameter space.

Approved Plots from SUS-10-006 ( click on plot to get .pdf )

Figure Abbreviated Caption
RA4_Mu_pf-4j30_met_lin.png Fig.1a: Distribution of missing transverse energy in the muon channel. The preselection requirements as well as MET>25 GeV have been applied. The yield for W+jets has been adjusted to have equal event numbers for data and simulation.
RA4_pf-4j30_ht_lin.png Fig.1b: Distribution of HT in the muon channel. The preselection requirements as well as MET>25 GeV have been applied. The yield for W+jets has been adjusted to have equal event numbers for data and simulation.
RA4_pf-4j30_lepton_pt_lin.png Fig.1c: Distribution of muon pT. The preselection requirements as well as MET>25 GeV have been applied. The yield for W+jets has been adjusted to have equal event numbers for data and simulation.
RA4_Ele_pf-4j30_met_lin.png Fig.1d: Distribution of missing transverse energy in the electron channel. The preselection requirements as well as MET>25 GeV have been applied. The yield for W+jets has been adjusted to have equal event numbers for data and simulation.
RA4_Ele_pf-4j30_ht_lin.png Fig.1e: Distribution of HT in the electron channel. The preselection requirements as well as MET>25 GeV have been applied. The yield for W+jets has been adjusted to have equal event numbers for data and simulation.
RA4_Ele_pf-4j30_lepton_pt_lin.png Fig.1f: Distribution of electron pT. The preselection requirements as well as MET>25 GeV have been applied. The yield for W+jets has been adjusted to have equal event numbers for data and simulation.
RA4_table_regions.gif Tab.1: Definition of loose and tight regions for the ABCD method.
RA4_table_region_counts_a.png Tab.2: Predicted and observed yields in the different regions of the ABCD method. The yields from simulation are included for comparison - the actual prediction is based on data.
RA4_Mu_pf-4j30_mc_htVSkinMetSig.png Fig.2a: Distribution of HT vs. MET/sqrt(HT) for standard model backgrounds (simulation) in the muon channel. The control regions ABC and the signal region D are shown for the tight selection.
RA4_Mu_pf-4j30_lm1_htVSkinMetSig.png Fig.2b: Distribution of HT vs. MET/sqrt(HT) for the SUSY benchmark point LM1 (simulation) in the muon channel.
RA4_Mu_pf-4j30_data_htVSkinMetSig.png Fig.2c: Distribution of HT vs. MET/sqrt(HT) for data in the muon channel.
RA4_Ele_pf-4j30_data_htVSkinMetSig.png Fig.2d: Distribution of HT vs. MET/sqrt(HT) for data in the electron channel.
RA4_Mu-ht300_pf-4j30_kinMetSig.png Fig.3a: Distribution of MET/sqrt(HT) in the muon channel for HT>300 GeV. The yield for W+jets has been adjusted like for Fig. 1 and 2.
RA4_Ele-ht300_pf-4j30_kinMetSig.png Fig.3b: Distribution of MET/sqrt(HT) in the electron channel for HT>300 GeV. The yield for W+jets has been adjusted like for Fig. 1 and 2.
SM-ptmu-met-v7.png Fig.4a: ttbar+Wjets MC, pt(mu) vs. MET, >=4 jets. In SM events the neutrino and lepton pt are anti-correlated in a given event. However, their overall spectra are very similar. The lepton spectrum method predicts the MET distribution using the lepton pt distribution.
LM1-ptmu-met-v7.png Fig.4b: SUSY LM1 MC, pt(mu) vs. MET, >=4 jets. In SUSY events the correlation between MET and lepton pt is very different than the SM. This is because the MET is mainly from the Lightest Supersymmetric Particles (LSPs).
DataActualVsPredictedMuonTightSelectionSmeared_v2.png Fig.5a: Lepton Spectrum Method, muon channel: MET distribution, observed vs. predicted, HT>500 GeV.
DataActualVsPredictedElectronTightSelectionMuPtSmeared_v2.png Fig.5b: Lepton Spectrum Method, electron channel: MET distribution, observed vs. predicted, HT>500 GeV.
RA4_ExclusionLimit_tanb10_LooseSelection.png Fig.6: Exclusion region in the CMSSM m1/2 vs. m0 plane for tan b = 10, based on the loose selection of the lepton-spectrum method, using the combined electron and muon samples. The observed limit is given for both LO and NLO assumed cross sections of the SUSY model points. In addition to the observed limit, the expected limit under the assumption of no signal contribution and the +- 1 sigma limits are shown.
RA4_ExclusionLimit_tanb10_TightSelection.png Fig.7: Exclusion region in the CMSSM m1/2 vs. m0 plane for tan b = 10, based on the tight selection of the lepton-spectrum method, using the combined electron and muon samples.
Topic attachments
ISorted ascending Attachment History Action Size Date Who Comment
GIFgif DataActualVsPredictedMuonTightSelectionSmeared.gif r2 r1 manage 14.7 K 2011-03-14 - 19:51 UnknownUser  
GIFgif RA4_ExclusionLimit_ATLAScomparison_tanb3.gif r1 manage 98.1 K 2011-03-22 - 05:56 UnknownUser  
GIFgif RA4_ExclusionLimit_tanb10.gif r1 manage 89.1 K 2011-03-22 - 06:00 UnknownUser  
GIFgif RA4_ExclusionLimit_tanb3.gif r2 r1 manage 105.9 K 2011-03-22 - 05:36 UnknownUser  
GIFgif RA4_ExclusionLimit_tanb50.gif r2 r1 manage 80.3 K 2011-03-22 - 05:35 UnknownUser  
GIFgif RA4_Mu_pf-4j30_ht_lin.gif r1 manage 12.9 K 2011-03-22 - 16:34 WolfgangAdam  
GIFgif RA4_Mu_pf-4j30_lepton_pt_lin.gif r1 manage 13.1 K 2011-03-22 - 16:36 WolfgangAdam  
GIFgif RA4_Mu_pf-4j30_met_lin.gif r1 manage 13.4 K 2011-03-22 - 15:35 WolfgangAdam  
GIFgif RA4_table_region_counts.gif r1 manage 38.5 K 2011-03-13 - 18:57 WolfgangAdam  
GIFgif RA4_table_region_counts_a.gif r1 manage 105.2 K 2011-03-13 - 19:41 WolfgangAdam  
GIFgif RA4_table_regions.gif r1 manage 17.3 K 2011-03-13 - 18:57 WolfgangAdam  
GIFgif TightSelectionNumbers.gif r3 r2 r1 manage 46.4 K 2011-03-14 - 21:43 UnknownUser  
PDFpdf DataActualVsPredictedElectronTightSelectionMuPtSmeared_v2.pdf r2 r1 manage 14.5 K 2011-07-21 - 19:50 WolfgangAdam  
PDFpdf DataActualVsPredictedMuonTightSelectionSmeared.pdf r2 r1 manage 15.0 K 2011-03-14 - 19:51 UnknownUser  
PDFpdf DataActualVsPredictedMuonTightSelectionSmeared_v2.pdf r2 r1 manage 14.7 K 2011-07-21 - 19:51 WolfgangAdam  
PDFpdf LM1-ptmu-met.pdf r4 r3 r2 r1 manage 22.1 K 2011-07-21 - 19:45 WolfgangAdam  
PDFpdf RA4_Efficiency_tanb10.pdf r1 manage 26.6 K 2011-03-21 - 08:03 DavidStuart RA4_Efficiency_tanb10.pdf
PDFpdf RA4_Efficiency_tanb3.pdf r1 manage 18.4 K 2011-03-21 - 08:00 DavidStuart RA4_Efficiency_tanb3.pdf
PDFpdf RA4_Efficiency_tanb50.pdf r1 manage 17.3 K 2011-03-21 - 08:04 DavidStuart RA4_Efficiency_tanb50.pdf
PDFpdf RA4_Ele-ht300_pf-4j30_kinMetSig.pdf r2 r1 manage 16.0 K 2011-07-21 - 19:34 WolfgangAdam  
PDFpdf RA4_Ele_pf-4j30_data_htVSkinMetSig.pdf r3 r2 r1 manage 21.3 K 2011-07-21 - 19:28 WolfgangAdam  
PDFpdf RA4_Ele_pf-4j30_ht_lin.pdf r3 r2 r1 manage 16.5 K 2011-07-21 - 19:17 WolfgangAdam  
PDFpdf RA4_Ele_pf-4j30_lepton_pt_lin.pdf r3 r2 r1 manage 15.6 K 2011-07-21 - 19:19 WolfgangAdam  
PDFpdf RA4_Ele_pf-4j30_met_lin.pdf r3 r2 r1 manage 15.5 K 2011-07-21 - 19:20 WolfgangAdam  
PDFpdf RA4_ExclusionLimit_ATLAScomparison_tanb3.pdf r1 manage 20.5 K 2011-03-22 - 05:55 UnknownUser  
PDFpdf RA4_ExclusionLimit_tanb10.pdf r1 manage 24.9 K 2011-03-22 - 05:59 UnknownUser  
PDFpdf RA4_ExclusionLimit_tanb10_LooseSelection.pdf r1 manage 22.7 K 2011-07-21 - 20:02 WolfgangAdam  
PDFpdf RA4_ExclusionLimit_tanb10_TightSelection.pdf r1 manage 24.3 K 2011-07-21 - 20:03 WolfgangAdam  
PDFpdf RA4_ExclusionLimit_tanb3.pdf r2 r1 manage 25.5 K 2011-03-22 - 01:02 UnknownUser RA4 mSugra Exclusion, tanbeta3
PDFpdf RA4_ExclusionLimit_tanb50.pdf r2 r1 manage 23.8 K 2011-03-22 - 05:31 UnknownUser  
PDFpdf RA4_Mu-ht300_pf-4j30_kinMetSig.pdf r2 r1 manage 16.1 K 2011-07-21 - 19:32 WolfgangAdam  
PDFpdf RA4_Mu_pf-4j30_data_htVSkinMetSig.pdf r3 r2 r1 manage 21.3 K 2011-07-21 - 19:30 WolfgangAdam  
PDFpdf RA4_Mu_pf-4j30_ht_lin.pdf r2 r1 manage 15.9 K 2011-07-21 - 19:09 WolfgangAdam  
PDFpdf RA4_Mu_pf-4j30_lepton_pt_lin.pdf r1 manage 15.9 K 2011-03-22 - 16:35 WolfgangAdam  
PDFpdf RA4_Mu_pf-4j30_lm1_htVSkinMetSig.pdf r3 r2 r1 manage 31.3 K 2011-07-21 - 19:29 WolfgangAdam  
PDFpdf RA4_Mu_pf-4j30_mc_htVSkinMetSig.pdf r3 r2 r1 manage 39.9 K 2011-07-21 - 19:30 WolfgangAdam  
PDFpdf RA4_Mu_pf-4j30_met_lin.pdf r1 manage 15.9 K 2011-03-22 - 15:35 WolfgangAdam  
PDFpdf RA4_pf-4j30_ht_lin.pdf r2 r1 manage 15.9 K 2011-07-21 - 19:13 WolfgangAdam  
PDFpdf RA4_pf-4j30_lepton_pt_lin.pdf r2 r1 manage 15.6 K 2011-07-21 - 19:15 WolfgangAdam  
PDFpdf RA4_pf-4j30_met_lin.pdf r2 r1 manage 15.5 K 2011-07-21 - 19:16 WolfgangAdam  
PDFpdf RA4_table_region_counts.pdf r1 manage 89.0 K 2011-03-13 - 18:58 WolfgangAdam  
PDFpdf RA4_table_region_counts_a.pdf r2 r1 manage 42.8 K 2011-04-15 - 10:11 RobertSchoefbeck  
PDFpdf RA4_table_regions.pdf r1 manage 89.0 K 2011-03-13 - 18:57 WolfgangAdam  
PDFpdf SM-ptmu-met.pdf r4 r3 r2 r1 manage 23.7 K 2011-07-21 - 19:44 WolfgangAdam  
PDFpdf TightSelectionNumbers.pdf r1 manage 103.9 K 2011-03-12 - 00:20 UnknownUser  
PNGpng DataActualVsPredictedElectronTightSelectionMuPtSmeared_v2.png r1 manage 89.1 K 2011-07-21 - 19:48 WolfgangAdam  
PNGpng DataActualVsPredictedMuonTightSelectionSmeared_v2.png r1 manage 91.0 K 2011-07-21 - 19:52 WolfgangAdam  
PNGpng LM1-ptmu-met-v7.png r1 manage 111.7 K 2011-07-21 - 19:46 WolfgangAdam  
PNGpng RA4_Efficiency_tanb10.png r1 manage 28.6 K 2011-03-21 - 08:04 DavidStuart RA4_Efficiency_tanb10.png
PNGpng RA4_Efficiency_tanb3.png r1 manage 28.1 K 2011-03-21 - 07:59 DavidStuart RA4_Efficiency_tanb3.png
PNGpng RA4_Efficiency_tanb50.png r1 manage 25.9 K 2011-03-21 - 08:05 DavidStuart RA4_Efficiency_tanb50.png
PNGpng RA4_Ele-ht300_pf-4j30_kinMetSig.png r1 manage 99.2 K 2011-07-21 - 19:40 WolfgangAdam  
PNGpng RA4_Ele_pf-4j30_data_htVSkinMetSig.png r1 manage 106.0 K 2011-07-21 - 19:28 WolfgangAdam  
PNGpng RA4_Ele_pf-4j30_ht_lin.png r1 manage 120.7 K 2011-07-21 - 19:18 WolfgangAdam  
PNGpng RA4_Ele_pf-4j30_lepton_pt_lin.png r1 manage 117.4 K 2011-07-21 - 19:20 WolfgangAdam  
PNGpng RA4_Ele_pf-4j30_met_lin.png r1 manage 113.5 K 2011-07-21 - 19:21 WolfgangAdam  
PNGpng RA4_ExclusionLimit_tanb10_LooseSelection.png r1 manage 202.7 K 2011-07-21 - 20:02 WolfgangAdam  
PNGpng RA4_ExclusionLimit_tanb10_TightSelection.png r1 manage 216.3 K 2011-07-21 - 20:03 WolfgangAdam  
PNGpng RA4_Mu-ht300_pf-4j30_kinMetSig.png r1 manage 101.7 K 2011-07-21 - 19:41 WolfgangAdam  
PNGpng RA4_Mu_pf-4j30_data_htVSkinMetSig.png r1 manage 106.6 K 2011-07-21 - 19:30 WolfgangAdam  
PNGpng RA4_Mu_pf-4j30_lm1_htVSkinMetSig.png r1 manage 150.5 K 2011-07-21 - 19:30 WolfgangAdam  
PNGpng RA4_Mu_pf-4j30_mc_htVSkinMetSig.png r1 manage 154.0 K 2011-07-21 - 19:31 WolfgangAdam  
PNGpng RA4_pf-4j30_ht_lin.png r1 manage 111.2 K 2011-07-21 - 19:14 WolfgangAdam  
PNGpng RA4_pf-4j30_lepton_pt_lin.png r1 manage 120.3 K 2011-07-21 - 19:16 WolfgangAdam  
PNGpng RA4_pf-4j30_met_lin.png r1 manage 111.9 K 2011-07-21 - 19:17 WolfgangAdam  
PNGpng RA4_table_region_counts_a.png r1 manage 90.0 K 2011-04-15 - 10:12 RobertSchoefbeck  
PNGpng SM-ptmu-met-v7.png r1 manage 113.2 K 2011-07-21 - 19:45 WolfgangAdam  
Edit | Attach | Watch | Print version | History: r17 < r16 < r15 < r14 < r13 | Backlinks | Raw View | WYSIWYG | More topic actions
Topic revision: r17 - 2011-07-21 - WolfgangAdam
 
    • Cern Search Icon Cern Search
    • TWiki Search Icon TWiki Search
    • Google Search Icon Google Search

    CMSPublic All webs login

This site is powered by the TWiki collaboration platform Powered by PerlCopyright & 2008-2019 by the contributing authors. All material on this collaboration platform is the property of the contributing authors.
Ideas, requests, problems regarding TWiki? Send feedback