Search for gluinos in events with two same-sign leptons, jets and missing transverse momentum with the ATLAS detector in pp collisions at sqrt(s) = 7 TeV

TL;DR

This paper reports a search for gluinos in proton-proton collisions at 7 TeV using the ATLAS detector, finding no evidence of gluinos but setting new exclusion limits on their mass.

Contribution

It introduces a novel search strategy for gluinos decaying via the top squark using same-sign leptons and missing energy at 7 TeV.

Findings

Gluino masses below 550 GeV are excluded at 95% CL.

Gluino masses up to 750 GeV can be excluded depending on model parameters.

No excess beyond Standard Model expectations was observed.

Abstract

A search is presented for gluinos decaying via the supersymmetric partner of the top quark using events with two same-sign leptons, jets and missing transverse momentum. The analysis is performed with 2.05 fb^-1 of integrated luminosity from pp collisions at sqrt(s) = 7 TeV collected by the ATLAS detector at the LHC. No excess beyond the Standard Model expectation is observed and exclusion limits are derived for simplified models where the gluino decays via the supersymmetric partner of the top quark and in the MSUGRA/CMSSM framework. In those scenarios, gluino masses below 550 GeV are excluded at 95% CL within the parameter space considered, significantly extending the coverage with respect to existing limits. Depending on the model parameters, gluino masses up to 750 GeV can also be excluded at 95% CL.