Search for direct production of a pair of bottom squarks

Link to Physics Analysis Summary (PAS)

The Analysis is documented in the [Coming Soon]

Abstract : This report presents a search for direct production of bottom squark pairs in proton-proton collision events at sqrt(s) = 8 TeV collected by the CMS experiment at the LHC in 2012. The data used correspond to an integrated luminosity of 19.4 fb-1. This search is performed in a final state of two jets, at least one of which is tagged as originating from a b-quark, accompanied by large missing transverse momentum, as well as large transverse mass and contransverse mass calculated from the jets and missing transverse momentum. The observed data in the signal region are consistent with the standard model backgrounds predicted using data control samples. The results are interpreted in terms of a simplified model production of a pair of bottom squarks with each bottom squark decaying to a bottom quark and a weakly interacting stable neutral particle. The production of bottom squarks with mass up to 700 GeV is excluded at 95% confidence level for neutralino masses less than 50 GeV.


Tables Plots in the PAS

Figure/Table Links Description
pdf, png Figure 1: Bottom squark pair production with the bottom squark decaying into a bottom quark and neutralino.
pdf, png Table 1: Definition of eight exclusive search regions.

(a) pdf, png,
(b) pdf, png,
(c) pdf, png,
(d) pdf, png
Figure 2: The MCT and ETmiss distributions in data and MC for baseline selected events, with Nb-jets=1 and Nb-jets=2.The distributions of MCT and ETmiss for two signal points, one with mb = 750 GeV and LSP mass of 50 GeV and the second point with mb = 300 GeV and LSP mass of 150 GeV, are shown by hatched lines.
pdf, png Table 2: Event yields, normalized to the integrated luminosity, from MC simulation after applying all preselection and baseline cuts in the signal region with one b-jet.
pdf, png Table 3: Event yields, normalized to the integrated luminosity, from MC simulation after applying all preselection and baseline cuts in the signal region with two b-jets.
pdf,png Table 4: Jet, lepton, b-jet, the CSV working points (Loose or Medium WP) and kinematic requirements for the signal regions and all control samples.
(a) pdf, png,
(b) pdf, png
Figure3: The MCT and ETmiss distributions in data and MC for mu+jets events, with Nb-jets=0.
pdf, png Table 5: Predicted event yields for Z(vv)+jets background in the MCT and b-jet multiplicity bins.
pdf, png Table 6: Systematic uncertainties on the predicted numbers of Z(vv)+jets events for various search regions.

(a) pdf, png,
(b) pdf, png,
(c) pdf, png,
(d) pdf, png
Figure4: The MCT and ETmiss distributions in data and MC for mu+jets events, with Nb-jets=1 and Nb-jets=2.
pdf, png Table 7: Predicted event yields for Top+W(lv)+jets background in the MCT and b-jet multiplicity bins.
pdf, png Table 8: The uncertainties on the predicted top and W(`n)+jets background are shown for all MCT and Nb-jets bins. TF stands for the translation factor.
pdf, png Table 9: Predicted event yields for QCD background in the MCT and b-jet multiplicity bins.
(a) pdf, png,
(b) pdf, png
Figure5: Comparison of data and predicted backgrounds in the various MCT and b-jet multiplicity bins.
pdf, png Table 10: Predicted event yields for the different background contributions are compared with data in each search region. The uncertainties on predicted background yields are the quadratic sum of the systematic and statistical uncertainties.
pdf, png ,C Figure 6: Combined 95% CL exclusion limits on the bottom squark cross sections. The cross sections are determined at NLO in the strong coupling constant and include the resummation of soft gluon emission at the accuracy of next-to-leading-log (NLL) level. The plot shows the expected limit as a red dashed line. The observed limit is shown as a black solid line. The dashed red (solid black) lines represent the expected (observed) exclusion contours at 95% CL. The total experimental uncertainty is shown around the expected limit contour as dashed red lines, and the theoretical uncertainty is shown around the observed limit contour as thin black lines.

Additional materials

Figure/Table Links Description
pdf, png Figure 7: The signal efficiency times acceptance after applying baseline cuts for the events with one b-jet.
pdf, png Figure 8: The signal efficiency times acceptance after applying baseline cuts for the events with two b-jets.
pdf, png Figure 9: The search region with the best expected sensitivity for each signal point.
Topic attachments
I Attachment History Action Size Date Who Comment
PDFpdf Bins.pdf r1 manage 39.9 K 2014-03-14 - 15:57 BatoolSafarzadehSamani  
PNGpng Bins.png r1 manage 47.1 K 2014-03-14 - 15:57 BatoolSafarzadehSamani  
PDFpdf Eff_1b.pdf r2 r1 manage 15.7 K 2014-03-10 - 14:27 BatoolSafarzadehSamani  
PNGpng Eff_1b.png r2 r1 manage 24.8 K 2014-03-10 - 14:27 BatoolSafarzadehSamani  
PDFpdf Eff_2b.pdf r2 r1 manage 15.6 K 2014-03-11 - 17:54 BatoolSafarzadehSamani  
PNGpng Eff_2b.png r2 r1 manage 24.6 K 2014-03-11 - 17:54 BatoolSafarzadehSamani  
PDFpdf Eff_2bs.pdf r1 manage 22.6 K 2014-02-28 - 12:13 BatoolSafarzadehSamani  
PNGpng Eff_2bs.png r1 manage 36.2 K 2014-02-28 - 12:13 BatoolSafarzadehSamani  
PDFpdf Event_1b_MC.pdf r1 manage 71.1 K 2014-02-27 - 19:15 BatoolSafarzadehSamani  
PNGpng Event_1b_MC.png r1 manage 78.3 K 2014-02-28 - 09:56 BatoolSafarzadehSamani  
PDFpdf Event_2b_MC.pdf r1 manage 64.8 K 2014-02-27 - 19:15 BatoolSafarzadehSamani  
PNGpng Event_2b_MC.png r1 manage 71.6 K 2014-02-28 - 09:56 BatoolSafarzadehSamani  
PDFpdf Event_Pred.pdf r4 r3 r2 r1 manage 88.0 K 2014-03-31 - 10:30 BatoolSafarzadehSamani  
PNGpng Event_Pred.png r4 r3 r2 r1 manage 109.5 K 2014-03-31 - 10:30 BatoolSafarzadehSamani  
PDFpdf MCT.pdf r3 r2 r1 manage 17.9 K 2014-03-03 - 19:35 BatoolSafarzadehSamani  
PNGpng MCT.png r3 r2 r1 manage 25.1 K 2014-03-03 - 19:35 BatoolSafarzadehSamani  
PDFpdf MCT_1b.pdf r3 r2 r1 manage 18.8 K 2014-03-15 - 09:44 BatoolSafarzadehSamani  
PNGpng MCT_1b.png r3 r2 r1 manage 38.1 K 2014-03-15 - 09:44 BatoolSafarzadehSamani  
PDFpdf MCT_1b_1mu.pdf r2 r1 manage 17.3 K 2014-03-03 - 19:28 BatoolSafarzadehSamani  
PNGpng MCT_1b_1mu.png r2 r1 manage 24.5 K 2014-03-03 - 19:28 BatoolSafarzadehSamani  
PDFpdf MCT_2bs.pdf r3 r2 r1 manage 18.2 K 2014-03-15 - 09:44 BatoolSafarzadehSamani  
PNGpng MCT_2bs.png r3 r2 r1 manage 35.4 K 2014-03-15 - 09:44 BatoolSafarzadehSamani  
PDFpdf MCT_2bs_1mu.pdf r2 r1 manage 16.9 K 2014-03-03 - 19:28 BatoolSafarzadehSamani  
PNGpng MCT_2bs_1mu.png r2 r1 manage 24.0 K 2014-03-03 - 19:28 BatoolSafarzadehSamani  
PDFpdf MET.pdf r2 r1 manage 18.0 K 2014-03-03 - 19:31 BatoolSafarzadehSamani  
PNGpng MET.png r2 r1 manage 25.5 K 2014-03-03 - 19:31 BatoolSafarzadehSamani  
PDFpdf MET_1b.pdf r2 r1 manage 21.4 K 2014-03-03 - 19:04 BatoolSafarzadehSamani  
PNGpng MET_1b.png r3 r2 r1 manage 41.7 K 2014-03-15 - 09:44 BatoolSafarzadehSamani  
PDFpdf MET_1b_1mu.pdf r2 r1 manage 18.3 K 2014-03-03 - 19:28 BatoolSafarzadehSamani  
PNGpng MET_1b_1mu.png r2 r1 manage 25.0 K 2014-03-03 - 19:28 BatoolSafarzadehSamani  
PDFpdf MET_2bs.pdf r3 r2 r1 manage 19.7 K 2014-03-15 - 09:44 BatoolSafarzadehSamani  
PNGpng MET_2bs.png r3 r2 r1 manage 37.7 K 2014-03-15 - 09:44 BatoolSafarzadehSamani  
PDFpdf MET_2bs_1mu.pdf r2 r1 manage 17.2 K 2014-03-03 - 19:28 BatoolSafarzadehSamani  
PNGpng MET_2bs_1mu.png r2 r1 manage 24.0 K 2014-03-03 - 19:31 BatoolSafarzadehSamani  
PDFpdf Pred_1b.pdf r2 r1 manage 16.4 K 2014-03-03 - 18:43 BatoolSafarzadehSamani  
PNGpng Pred_1b.png r2 r1 manage 25.0 K 2014-03-03 - 18:43 BatoolSafarzadehSamani  
PDFpdf Pred_2b.pdf r2 r1 manage 16.2 K 2014-03-03 - 18:43 BatoolSafarzadehSamani  
PNGpng Pred_2b.png r2 r1 manage 24.9 K 2014-03-03 - 18:43 BatoolSafarzadehSamani  
PDFpdf QCD.pdf r2 r1 manage 23.0 K 2014-03-25 - 12:25 BatoolSafarzadehSamani  
PNGpng QCD.png r4 r3 r2 r1 manage 56.9 K 2014-03-25 - 12:25 BatoolSafarzadehSamani  
PDFpdf Regions.pdf r2 r1 manage 94.3 K 2014-03-25 - 12:22 BatoolSafarzadehSamani  
PNGpng Regions.png r2 r1 manage 100.2 K 2014-03-25 - 12:22 BatoolSafarzadehSamani  
PNGpng SensetiveBin.png r1 manage 42.2 K 2014-03-03 - 09:04 BatoolSafarzadehSamani  
PNGpng Sensitive.png r3 r2 r1 manage 44.7 K 2014-03-12 - 10:06 BatoolSafarzadehSamani  
PDFpdf SensitiveBin.pdf r4 r3 r2 r1 manage 16.5 K 2014-03-12 - 10:06 BatoolSafarzadehSamani  
PDFpdf T2bb.pdf r1 manage 30.1 K 2014-02-27 - 11:58 BatoolSafarzadehSamani  
PNGpng T2bb.png r1 manage 33.7 K 2014-02-27 - 11:58 BatoolSafarzadehSamani  
PDFpdf T2bbXS.pdf r1 manage 24.6 K 2014-02-27 - 11:58 BatoolSafarzadehSamani  
PNGpng T2bbXS.png r1 manage 224.9 K 2014-02-27 - 11:58 BatoolSafarzadehSamani  
C source code filec T2bbXSEC.C r1 manage 79.6 K 2014-03-06 - 13:16 BatoolSafarzadehSamani  
PDFpdf T2bbXSEC.pdf r1 manage 24.7 K 2014-03-06 - 13:16 BatoolSafarzadehSamani  
PNGpng T2bbXSEC.png r1 manage 25.4 K 2014-03-06 - 13:23 BatoolSafarzadehSamani  
PDFpdf Table6.pdf r1 manage 111.9 K 2014-03-15 - 10:13 BatoolSafarzadehSamani  
PNGpng Table6.png r1 manage 116.8 K 2014-03-15 - 10:13 BatoolSafarzadehSamani  
PDFpdf Table8.pdf r1 manage 84.0 K 2014-03-15 - 10:13 BatoolSafarzadehSamani  
PNGpng Table8.png r1 manage 83.9 K 2014-03-15 - 10:13 BatoolSafarzadehSamani  
PDFpdf WTop.pdf r1 manage 34.0 K 2014-03-03 - 09:30 BatoolSafarzadehSamani  
PNGpng WTop.png r1 manage 136.1 K 2014-03-03 - 09:30 BatoolSafarzadehSamani  
PDFpdf Zinv.pdf r2 r1 manage 32.2 K 2014-03-03 - 09:35 BatoolSafarzadehSamani  
PNGpng Zinv.png r2 r1 manage 141.7 K 2014-03-03 - 09:35 BatoolSafarzadehSamani  
Edit | Attach | Watch | Print version | History: r5 < r4 < r3 < r2 < r1 | Backlinks | Raw View | WYSIWYG | More topic actions
Topic revision: r5 - 2014-09-03 - BatoolSafarzadehSamani
    • 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