Exclusion limits on gluino and top-squark pair production in natural SUSY scenarios with inclusive razor and exclusive single-lepton searches at sqrt(s) = 8 TeV

Abstract

A set of gluino and top squark exclusion bounds is presented, derived from the search for supersymmetry in events with b-jets at $\sqrt{s}=8$ TeV based on the razor variables $R^2$ and $M_R$ and on the exclusive search for top squarks in events with one electron or muon. Exclusion limits on the gluino and top squark are derived at 95% confidence level from the combination of the nine razor boxes. For the top squark, the combined likelihood of the razor hadronic analysis and the exclusive top squark search in events with single-lepton results in a stronger bound on the top squark mass.

Link to PAS

PAS-SUS-14-011

Figures in the PAS

SMS Interpretations Caption
Figure 1: Simplified natural SUSY spectrum considered as a benchmark for result interpretations. The neutralino is forced to be the lightest SUSY particle. The difference in mass between the chargino and the neutralino is fixed to 5 GeV. Gluino and same-flavor squark pair production are considered in separate models, scanning the masses of the produced SUSY particle and the neutralino.
Figure 2: Diagrams displaying the event topologies of gluino production considered in the analysis.
Figure 3: Diagrams displaying the event topologies of top squark pair production considered in the analysis.
Figure 4: The limit on SUSY particle masses in the gluino-mediated models: T1tttt, T1tttb, T1ttbb, T1tbbb, and T1bbbb. The color coding denotes the observed 95% CL upper limit on the signal cross section. The dashed and solid lines represent the expected and observed exclusion contours at 95% CL, respectively. The dashed contours around the expected limit and the solid contours around the observed one represent the impact of the theoretical un- certainty in the cross section and the combination of the statistical and experimental systematic uncertainties, respectively.
Figure 5: The limit on SUSY particle masses in the squark-mediated models: T2tt, T2tb, and T2bW$^{\ast}$. The color scale denotes the observed 95% CL upper limit on the signal model cross section. The meaning of the color coding and the displayed contours are explained in the caption of Fig. 4.
Figure 6: Gluino mass limit at 95% CL, obtained for different gluino-gluino models, in the context of the benchmark natural SUSY spectrum of Fig. 1.
Figure 7: Top squark mass limit at 95% CL, obtained for different squark-squark models in the context of the benchmark natural SUSY spectrum of Fig. 1.
Figure 8: Top squark mass limit at 95% CL, obtained combining the result of the hadronic razor boxes with the result of the single-lepton channel for T2tt, T2tb, and independent of the branching ratio choice.

Additional Material

SMS Interpretations Caption
Observed top squark mass limit at 95% CL, obtained separately for the hadronic razor boxes and the single-lepton channel for T2tt.
GluinoLimitsRazor2014.root Electronic format of 95% CL exclusion limits for gluino-mediated models.
StopLimitsRazor2014.root Electronic format of 95% CL exclusion limits for stop-mediated models.
Topic attachments
I Attachment History Action Size Date Who Comment
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PNGpng naturalSpectrum.png r2 r1 manage 372.8 K 2014-07-05 - 12:11 JavierDuarte  
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Topic revision: r12 - 2015-02-19 - JavierDuarte
 
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