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Search for scalar top quark pair production in natural gauge mediated supersymmetry models with the ATLAS detector in pp collisions at √s = 7 TeV
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ATLAS Collaboration (Including: Farrington, Sinead). (2012) Search for scalar top quark pair production in natural gauge mediated supersymmetry models with the ATLAS detector in pp collisions at √s = 7 TeV. Physics Letters B, Volume 715 (Number 1-3). pp. 44-60. doi:10.1016/j.physletb.2012.07.010 ISSN 0370-2693.
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WRAP_Farrington_1-s2.0-S0370269312007502-main.pdf - Published Version Available under License Creative Commons Attribution. Download (1595Kb) | Preview |
Official URL: http://dx.doi.org/10.1016/j.physletb.2012.07.010
Abstract
The results of a search for pair production of the lighter scalar partners of top quarks () in 2.05 fb−1 of pp collisions at TeV using the ATLAS experiment at the LHC are reported. Scalar top quarks are searched for in events with two same flavour opposite-sign leptons (e,μ) with invariant mass consistent with the Z boson mass, large missing transverse momentum and jets in the final state. At least one of the jets is identified as originating from a b-quark. No excess over Standard Model expectations is found. The results are interpreted in the framework of R-parity conserving, gauge mediated Supersymmetry breaking ‘natural’ scenarios, where the neutralino () is the next-to-lightest supersymmetric particle. Scalar top quark masses up to 310 GeV are excluded for at 95% confidence level, reaching an exclusion of for . Scalar top quark masses below 240 GeV are excluded for all values of .
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