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Impact of LHC searches on NLSP top squark and gluino mass

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Abstract

We explore the implications of 7 TeV LHC searches for a scenario in which one of the stops is the next-to-lightest supersymmetric particle (NLSP). The NLSP stop \( \left( {{{\tilde{t}}_1}} \right) \) is assumed to decay exclusively into neutralino and charm quark. We consider processes where the stops are pair produced together with a hard QCD jet. We also consider stop quarks from gluino decays, \( \tilde{g} \to t\tilde{t}_1^{ * } + \bar{t}{\tilde{t}_1} \). We show that the monojet ATLAS and CMS searches corresponding to 1 fb−1 of integrated luminosity are sensitive to stop masses of up to 160 GeV, with the 20 % neutralino-stop coannihilation region essentially ruled out for \( {M_{{{{\tilde{t}}_1}}}}{\underset{\raise0.3em\hbox{$\smash{\scriptscriptstyle\thicksim}$}}{ < }}140\,{\text{GeV}} \). The region \( {M_{{{{\tilde{t}}_1}}}}{\underset{\raise0.3em\hbox{$\smash{\scriptscriptstyle\thicksim}$}}{ < }}130\,{\text{GeV}} \) is excluded with even relatively larger mass difference, \( {M_{{{{\tilde{t}}_1}}}} - {M_{{\tilde{\chi }_1^0}}} \sim 40\,{\text{GeV}} \), by the multi-jets search. The b-jet and same-sign dilepton searches are sensitive to a heavier gluino because they only pick up gluino pair production events followed by top quarks decaying into b-jets and same-sign dileptons, respectively. We find that the LHC data places a lower limit on the gluino mass in this scenario of about 600 GeV (700 GeV) from b-jets (same-sign dileptons) searches.

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  1. Bartol Research Institute, Department of Physics and Astronomy, University of Delaware, Newark, Delaware, 19716, U.S.A.

    Bin He, Tong Li & Qaisar Shafi

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  1. Bin He
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Correspondence to Tong Li.

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He, B., Li, T. & Shafi, Q. Impact of LHC searches on NLSP top squark and gluino mass. J. High Energ. Phys. 2012, 148 (2012). https://doi.org/10.1007/JHEP05(2012)148

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