Search for R-parity-violating supersymmetry in proton-proton collisions at √s = 8 CMS.TeV in events with large jet and b-jet multiplicity

Abstract

Preliminary results are reported from a search for new physics beyond the standard model (SM) in proton-proton collisions at a center-of-mass energy √s=8 CMS.TeV, focusing on the signature of large multiplicity of jets and b-tagged jets. The data sample comprises an integrated luminosity of 19.5 fb-1, recorded by the CMS experiment at the Large Hadron Collider (LHC). The results are used to exclude gluinos with mgluino<980 CMS.GeV in an R-parity violating supersymmetric extension of the standard model in which each gluino decays to tbs.

Plots for analysis of fully hadronic final state

 gluinodiagram.pdf

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Feynman diagram for pair production of gluinos decaying to tbs.

 CSV_fit.pdf

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Fit to the CSV distribution in data for 4 ≤ Njet ≤ 5, HT > 1.1 CMS.TeV and CSV b-tagging discriminant> 0.9. Error bars indicate the statistical uncertainty arising from MC statistics.

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Data (dots with error bars), uncorrected MC prediction (green band), and truth- matched gluon splitting events scaled to the data-MC difference in ∆R < 1.6 (black histogram) in a typical signal region corresponding to HT > 1750 CMS.GeV and Njet = 6.

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Data (dots with error bars) and the corrected prediction of the Nb distribution are shown. The shaded band shows the MC statistical uncertainty. Events are required to have 1000 < HT < 1750 CMS.GeV. The jet multiplicity requirements are Njet = 4 (left), Njet = 5 (middle), and Njet = 6 (right).

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Data (dots with error bars) and the corrected prediction of the Nb distribution are shown. The shaded band shows the MC statistical uncertainty. Events are required to have HT > 1750 CMS.GeV. The jet multiplicity requirements are Njet = 4 (left), Njet = 5 (middle), and Njet = 6 (right).

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Data (dots with error bars) and the corrected prediction of the Nb distribution in the high Njet signal region. The shaded band shows the MC statistical uncertainty. Events are required to have 1000 < HT < 1750 CMS.GeV. The jet multiplicity requirements are Njet = 7 (left) and Njet ≥ 8 (right).

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Data (dots with error bars) and the corrected prediction of the Nb distribution in the high Njet signal region. The shaded band shows the MC statistical uncertainty. Events are required to have HT > 1750 CMS.GeV. The jet multiplicity requirements are Njet = 7 (left) and Njet ≥ 8 (right).

signal_efficiency.pdf

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Signal efficiencies as a function of mgluino for Nb ≥ 2, HT > 1.0 CMS.TeV, and Njet ≥ 6, together with the breakdown among Njet bins.

limits_post_unblind_toys.pdf

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Expected and observed limits in the all-hadronic gluino → tbs analysis. The red band is the gluino pair production cross section.

-- ChrisWest - 2015-08-19

Topic attachments
I Attachment History Action Size Date Who Comment
PDFpdf CSV_fit.pdf r1 manage 15.1 K 2015-08-19 - 08:02 ChrisWest  
PNGpng CSV_fit.png r1 manage 15.1 K 2015-08-19 - 08:02 ChrisWest  
PDFpdf dataMC_N_BJet_eq4_HT1000_nominal.pdf r1 manage 17.4 K 2015-08-19 - 08:03 ChrisWest  
PNGpng dataMC_N_BJet_eq4_HT1000_nominal.png r2 r1 manage 29.8 K 2015-08-26 - 02:40 ChrisWest  
PDFpdf dataMC_N_BJet_eq4_HT1750_nominal.pdf r1 manage 16.7 K 2015-08-19 - 08:03 ChrisWest  
PNGpng dataMC_N_BJet_eq4_HT1750_nominal.png r2 r1 manage 29.2 K 2015-08-26 - 02:40 ChrisWest  
PDFpdf dataMC_N_BJet_eq5_HT1000_nominal.pdf r1 manage 18.0 K 2015-08-19 - 08:03 ChrisWest  
PNGpng dataMC_N_BJet_eq5_HT1000_nominal.png r2 r1 manage 37.5 K 2015-08-26 - 02:40 ChrisWest  
PDFpdf dataMC_N_BJet_eq5_HT1750_nominal.pdf r1 manage 17.2 K 2015-08-19 - 08:03 ChrisWest  
PNGpng dataMC_N_BJet_eq5_HT1750_nominal.png r2 r1 manage 39.2 K 2015-08-26 - 02:41 ChrisWest  
PDFpdf dataMC_N_BJet_eq6_HT1000_nominal.pdf r1 manage 17.7 K 2015-08-19 - 08:03 ChrisWest  
PNGpng dataMC_N_BJet_eq6_HT1000_nominal.png r2 r1 manage 35.8 K 2015-08-26 - 02:41 ChrisWest  
PDFpdf dataMC_N_BJet_eq6_HT1750_nominal.pdf r1 manage 16.8 K 2015-08-19 - 08:03 ChrisWest  
PNGpng dataMC_N_BJet_eq6_HT1750_nominal.png r2 r1 manage 30.3 K 2015-08-26 - 02:41 ChrisWest  
PDFpdf dataMC_N_BJet_eq7_HT1000_nominal.pdf r1 manage 17.5 K 2015-08-19 - 08:03 ChrisWest  
PNGpng dataMC_N_BJet_eq7_HT1000_nominal.png r2 r1 manage 34.1 K 2015-08-26 - 02:41 ChrisWest  
PDFpdf dataMC_N_BJet_eq7_HT1750_nominal.pdf r1 manage 16.8 K 2015-08-19 - 08:03 ChrisWest  
PNGpng dataMC_N_BJet_eq7_HT1750_nominal.png r2 r1 manage 32.1 K 2015-08-26 - 02:41 ChrisWest  
PDFpdf dataMC_N_BJet_geq8_HT1000_nominal.pdf r1 manage 17.4 K 2015-08-19 - 08:03 ChrisWest  
PNGpng dataMC_N_BJet_geq8_HT1000_nominal.png r2 r1 manage 32.9 K 2015-08-26 - 02:41 ChrisWest  
PDFpdf dataMC_N_BJet_geq8_HT1750_nominal.pdf r1 manage 16.8 K 2015-08-19 - 08:03 ChrisWest  
PNGpng dataMC_N_BJet_geq8_HT1750_nominal.png r2 r1 manage 32.0 K 2015-08-26 - 02:41 ChrisWest  
PDFpdf deltaR_eq6_HT1750_gluonSplitting.pdf r1 manage 15.0 K 2015-08-19 - 08:02 ChrisWest  
PNGpng deltaR_eq6_HT1750_gluonSplitting.png r1 manage 16.7 K 2015-08-19 - 08:02 ChrisWest  
PDFpdf gluinodiagram.pdf r1 manage 15.3 K 2015-08-19 - 08:06 ChrisWest  
PNGpng gluinodiagram.png r1 manage 23.3 K 2015-08-19 - 08:06 ChrisWest  
PDFpdf limits_post_unblind_toys.pdf r2 r1 manage 104.1 K 2015-08-26 - 02:46 ChrisWest  
PNGpng limits_post_unblind_toys.png r2 r1 manage 20.0 K 2015-08-26 - 02:46 ChrisWest  
PDFpdf signal_efficiency.pdf r1 manage 14.8 K 2015-08-19 - 08:02 ChrisWest  
PNGpng signal_efficiency.png r1 manage 19.7 K 2015-08-19 - 08:02 ChrisWest  
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Topic revision: r3 - 2015-09-11 - FilipMoortgat
 
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