Search for supersymmetry in events with a single lepton and jets using templates

Abstract

Preliminary results on the search for new physics are reported based on a sample of proton-proton collisions recorded in 2011 by the CMS experiment at the Large Hadron Collider, focusing on events with a single isolated lepton, multiple energetic jets and large missing transverse momentum. The sample corresponds to an integrated luminosity of 4.98 fb-1 at a centre-of-mass energy of 7 TeV. Standard model yields are predicted using missing momentum spectra extracted from control regions in data. These predictions are done as a function of the number of identified b-quark jets in the event. The observed event numbers are compatible with expectations and the results are interpreted in terms of limits on the parameter space of the constrained minimal supersymmetric extension of the standard model and of a simplified model with enhanced production of 3rd generation quarks.

Link to approved PAS.

PAS-SUS-11-027

Plots and tables

FIGURE (click image for PDF) Caption
Upper panel: distribution of the highest b-tag discriminator value in the event in the muon channel. Jets with a discriminator value above 1.74 are considered as b-tagged. Simulated events are normalized according to an integrated luminosity of 4.98 fb-1. The entries at negative discriminator values indicate events without a reconstructed secondary vertex. Points represent data while the coloured areas correspond to the superposition of different background components predicted by simulation. The lower panel shows the ratio between data and simulation.
Upper panel: multiplicity of identified b-jets in the muon channel. Jets with a discriminator value above 1.74 are considered as b-tagged. Simulated events are normalized according to an integrated luminosity of 4.98 fb-1. The entries at negative discriminator values indicate events without a reconstructed secondary vertex. Points represent data while the coloured areas correspond to the superposition of different background components predicted by simulation. The lower panel shows the ratio between data and simulation
Event counts for the subsamples corresponding to 0-, 1- and ≥2 b-tagged jets for data and simulation. The fractions of W+jets and ttbar events in simulation are also reported.
Evolution of the parameter b of the error function for HT > 300 GeV with the lower limit imposed on HT for both lepton flavours in the W+jets sample.
Evolution of the parameter c of the error function for HT > 300 GeV with the lower limit imposed on HT for both lepton flavours in the W+jets sample.
Evolution of the parameters b of the error function for HT > 300 GeV with the lower limit imposed on HT for both lepton flavours in the ttbar sample.
Evolution of the parameters c of the error function for HT > 300 GeV with the lower limit imposed on HT for both lepton flavours in the ttbar sample.
Fit results for the parameter α in data and simulation.
Electron channel: the fitted parameter α as obtained from data and as a function of HT for three components: W++jets, W-+jets and ttbar .
Muon channel: the fitted parameter α as obtained from data and as a function of HT for three components: W++jets, W-+jets and ttbar .
Distribution of ETmiss in the muon channel: simulation of backgrounds and signal (LM6) for 350 < HT < 750 GeV
Distribution of ETmiss in the muon channel: simulation of backgrounds and signal (LM6) for HT > 750 GeV.
Distribution of ETmiss in the muon channel: data (points) and fit result (line) for 350 < HT < 750 GeV. The bands around the fit correspond to the statistical uncertainty on the parameter α. The lower panel shows the ratio between the fitted model and data.
Distribution of ETmiss in the muon channel: data (points) and prediction obtained from the fit (line) for HT > 750 GeV. The bands around the fit correspond to the statistical uncertainty on the parameter α. The lower panel shows the ratio between the fitted model and data.
Predicted and true event counts in simulation for different signal regions. Uncertainties are statistical.
Overview of the predicted and observed yields with statistical and systematical uncertainties for different signal regions. Details on the composition of the systematic uncertainties are described in Section 5.4 of the PAS.
Relative systematic uncertainties for the background estimation in the signal region HT > 1000 GeV and 250 < ETmiss < 2500 GeV .
Relative systematic uncertainties related to b-jet identification in the signal region HT > 1000 GeV and 250 < ETmiss < 2500 GeV .
Systematic uncertainty related to closure on simulation and on the predictions in the 1-tag, ≥1-tag and ≥2-tag bins related to the relative variations in the predictions when excluding data in the 1-tag or ≥2-tag bin from the fit.
The 95% CL exclusion limits using the CLS technique for the CMSSM model with tan β = 10, A0 = 0 GeV, and μ > 0. The solid red line corresponds to the median expected limit, including all experimental uncertainties. The area below the solid red line (observed limit) is excluded, with the thin red dashed lines showing the effect of a variation of the signal yields due to theoretical uncertainties. The thick black dashed line shows the expected limit. It is surrounded by a shaded area representing the experimental uncertainties.
Topology of the T1tttt model.
Acceptance times efficiency as a function of the two mass parameters of the T1tttt model. The diagonal dashed line marks the lower kinematical limit of the LSP mass.
The 95% CL upper limit on the cross section using the CLS technique for the T1tttt model. The area below the thick solid red line is excluded. The thick dashed black line represents the expected limit. The diagonal dashed line marks the lower kinematical limit of the LSP mass.

Additional material

FIGURE (click image for PDF) Caption
Distribution of ETmiss in the electron channel: simulation of backgrounds and signal (LM6) for 350 < HT < 750 GeV.
Distribution of ETmiss in the electron channel: simulation of backgrounds and signal (LM6) for HT > 750 GeV.
Distribution of ETmiss in the electron channel: data (points) and fit result (line) for 350 < HT < 750 GeV. The bands around the fit correspond to the statistical uncertainty on the parameter α. The lower panel shows the ratio between the fitted model and data.
Distribution of ETmiss in the electron channel: data (points) and prediction obtained from the fit (line) for HT > 750 GeV. The bands around the fit correspond to the statistical uncertainty on the parameter α. The lower panel shows the ratio between the fitted model and data.
Distribution of ETmiss in the electron channel: data (points) and prediction obtained from the fit (line) for HT > 1000 GeV. The bands around the fit correspond to the statistical uncertainty on the parameter α. The lower panel shows the ratio between the fitted model and data.
Distribution of ETmiss in the muon channel: data (points) and prediction obtained from the fit (line) for HT > 1000 GeV. The bands around the fit correspond to the statistical uncertainty on the parameter α. The lower panel shows the ratio between the fitted model and data.
Topic attachments
I Attachment History Action Size Date Who Comment
PDFpdf Fig1a.pdf r1 manage 18.8 K 2012-05-16 - 16:18 WolfgangAdam  
PNGpng Fig1a.png r1 manage 94.9 K 2012-05-16 - 16:19 WolfgangAdam  
PDFpdf Fig1b.pdf r1 manage 16.7 K 2012-05-16 - 16:19 WolfgangAdam  
PNGpng Fig1b.png r1 manage 85.1 K 2012-05-16 - 16:19 WolfgangAdam  
PDFpdf Fig2a.pdf r1 manage 18.0 K 2012-05-16 - 16:20 WolfgangAdam  
PNGpng Fig2a.png r1 manage 164.8 K 2012-05-21 - 10:37 WolfgangAdam  
PDFpdf Fig2b.pdf r1 manage 17.9 K 2012-05-16 - 16:20 WolfgangAdam  
PNGpng Fig2b.png r2 r1 manage 150.2 K 2012-05-21 - 10:38 WolfgangAdam  
PDFpdf Fig2c.pdf r1 manage 18.0 K 2012-05-16 - 16:20 WolfgangAdam  
PNGpng Fig2c.png r2 r1 manage 156.9 K 2012-05-21 - 10:38 WolfgangAdam  
PDFpdf Fig2d.pdf r1 manage 17.8 K 2012-05-16 - 16:20 WolfgangAdam  
PNGpng Fig2d.png r2 r1 manage 144.4 K 2012-05-21 - 10:38 WolfgangAdam  
PDFpdf Fig3a.pdf r1 manage 21.9 K 2012-05-16 - 16:21 WolfgangAdam  
PNGpng Fig3a.png r2 r1 manage 164.0 K 2012-05-21 - 10:38 WolfgangAdam  
PDFpdf Fig3b.pdf r1 manage 21.5 K 2012-05-16 - 16:21 WolfgangAdam  
PNGpng Fig3b.png r2 r1 manage 159.5 K 2012-05-21 - 10:39 WolfgangAdam  
PDFpdf Fig4a.pdf r1 manage 15.2 K 2012-05-16 - 16:21 WolfgangAdam  
PNGpng Fig4a.png r1 manage 90.3 K 2012-05-16 - 16:21 WolfgangAdam  
PDFpdf Fig4b.pdf r1 manage 15.4 K 2012-05-16 - 16:21 WolfgangAdam  
PNGpng Fig4b.png r1 manage 91.0 K 2012-05-16 - 16:21 WolfgangAdam  
PDFpdf Fig5a.pdf r1 manage 20.6 K 2012-05-16 - 16:21 WolfgangAdam  
PNGpng Fig5a.png r1 manage 103.6 K 2012-05-16 - 16:21 WolfgangAdam  
PDFpdf Fig5b.pdf r1 manage 21.1 K 2012-05-16 - 16:22 WolfgangAdam  
PNGpng Fig5b.png r1 manage 107.1 K 2012-05-16 - 16:22 WolfgangAdam  
PDFpdf Fig6.pdf r1 manage 29.7 K 2012-05-21 - 10:44 WolfgangAdam  
PNGpng Fig6.png r1 manage 183.2 K 2012-05-21 - 10:44 WolfgangAdam  
PDFpdf Fig7.pdf r1 manage 8.4 K 2012-05-21 - 10:44 WolfgangAdam  
PNGpng Fig7.png r1 manage 24.1 K 2012-05-21 - 10:44 WolfgangAdam  
PDFpdf Fig8a.pdf r1 manage 17.1 K 2012-05-16 - 16:22 WolfgangAdam  
PNGpng Fig8a.png r1 manage 114.7 K 2012-05-16 - 16:22 WolfgangAdam  
PDFpdf Fig8b.pdf r1 manage 18.0 K 2012-05-16 - 16:22 WolfgangAdam  
PNGpng Fig8b.png r1 manage 148.2 K 2012-05-16 - 16:22 WolfgangAdam  
PDFpdf FigAdd1a.pdf r1 manage 15.2 K 2012-05-23 - 12:02 WolfgangAdam  
PNGpng FigAdd1a.png r1 manage 90.5 K 2012-05-23 - 12:02 WolfgangAdam  
PDFpdf FigAdd1b.pdf r1 manage 15.4 K 2012-05-23 - 12:02 WolfgangAdam  
PNGpng FigAdd1b.png r1 manage 90.9 K 2012-05-23 - 12:02 WolfgangAdam  
PDFpdf FigAdd2a.pdf r1 manage 20.4 K 2012-05-23 - 12:05 WolfgangAdam  
PNGpng FigAdd2a.png r1 manage 103.5 K 2012-05-23 - 12:05 WolfgangAdam  
PDFpdf FigAdd2b.pdf r1 manage 21.4 K 2012-05-23 - 12:27 WolfgangAdam  
PNGpng FigAdd2b.png r1 manage 108.9 K 2012-05-23 - 12:05 WolfgangAdam  
PDFpdf FigAdd3a.pdf r1 manage 20.9 K 2012-05-23 - 12:05 WolfgangAdam  
PNGpng FigAdd3a.png r1 manage 102.9 K 2012-05-23 - 12:05 WolfgangAdam  
PDFpdf FigAdd3b.pdf r1 manage 20.7 K 2012-05-23 - 12:05 WolfgangAdam  
PNGpng FigAdd3b.png r1 manage 102.1 K 2012-05-23 - 12:05 WolfgangAdam  
PDFpdf PaperFig10a.pdf r1 manage 17.5 K 2012-12-19 - 14:50 WolfgangAdam  
PNGpng PaperFig10a.png r1 manage 147.4 K 2012-12-19 - 14:50 WolfgangAdam  
PDFpdf PaperFig4a.pdf r1 manage 19.7 K 2012-12-19 - 14:28 WolfgangAdam  
PNGpng PaperFig4a.png r2 r1 manage 106.5 K 2012-12-19 - 14:32 WolfgangAdam  
PDFpdf PaperFig4b.pdf r1 manage 19.7 K 2012-12-19 - 14:28 WolfgangAdam  
PNGpng PaperFig4b.png r2 r1 manage 107.2 K 2012-12-19 - 14:32 WolfgangAdam  
PDFpdf PaperFig7a.pdf r1 manage 21.3 K 2012-12-19 - 14:35 WolfgangAdam  
PNGpng PaperFig7a.png r1 manage 100.2 K 2012-12-19 - 14:35 WolfgangAdam  
PDFpdf PaperFig7b.pdf r1 manage 21.7 K 2012-12-19 - 14:35 WolfgangAdam  
PNGpng PaperFig7b.png r1 manage 103.0 K 2012-12-19 - 14:35 WolfgangAdam  
PDFpdf PaperFig8a.pdf r1 manage 28.6 K 2012-12-19 - 14:46 WolfgangAdam  
PNGpng PaperFig8a.png r1 manage 163.6 K 2012-12-19 - 14:46 WolfgangAdam  
PDFpdf PaperFig9a.pdf r1 manage 16.2 K 2012-12-19 - 14:50 WolfgangAdam  
PNGpng PaperFig9a.png r1 manage 96.1 K 2012-12-19 - 14:50 WolfgangAdam  
PDFpdf PaperTab2.pdf r1 manage 102.5 K 2012-12-19 - 14:41 WolfgangAdam  
PNGpng PaperTab2.png r1 manage 95.5 K 2012-12-19 - 14:41 WolfgangAdam  
PNGpng Tab1.png r1 manage 42.7 K 2012-05-21 - 10:37 WolfgangAdam  
PNGpng Tab2.png r1 manage 23.8 K 2012-05-21 - 10:39 WolfgangAdam  
PNGpng Tab3.png r1 manage 102.0 K 2012-05-21 - 10:39 WolfgangAdam  
PNGpng Tab4.png r1 manage 112.1 K 2012-05-21 - 10:39 WolfgangAdam  
PNGpng Tab5.png r1 manage 133.4 K 2012-05-21 - 10:39 WolfgangAdam  
PNGpng Tab6.png r1 manage 30.2 K 2012-05-21 - 10:39 WolfgangAdam  
PNGpng Tab7.png r1 manage 30.9 K 2012-05-21 - 10:39 WolfgangAdam  
Edit | Attach | Watch | Print version | History: r9 < r8 < r7 < r6 < r5 | Backlinks | Raw View | WYSIWYG | More topic actions
Topic revision: r9 - 2012-12-19 - 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