Search for scalar top quark pair production in natural gauge mediated supersymmetry models with the ATLAS detector in pp collisions at √s = 7 TeV
Author(s)Taylor, Frank E.
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The results of a search for pair production of the lighter scalar partners of top quarks ([bar over t][subscript 1]) in 2.05 fb[superscript −1] of pp collisions at √s = 7 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 ([bar over χ][0 over 1]) is the next-to-lightest supersymmetric particle. Scalar top quark masses up to 310 GeV are excluded for 115 GeV <m[subscript bar over χ][subscript 0 over 1] < 230 GeV at 95% confidence level, reaching an exclusion of m[subscript bar over t][subscript 1] < 330 GeV for m[subscript bar over χ][subscript 0 over 1] = 190 GeV. Scalar top quark masses below 240 GeV are excluded for all values of m[subscript bar over χ][subscript 0 over 1] > m[subscript Z].
DepartmentMassachusetts Institute of Technology. Department of Physics
Physics Letters B
Aad, G., B. Abbott, J. Abdallah, S. Abdel Khalek, A.A. Abdelalim, O. Abdinov, B. Abi, et al. “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 715, no. 1–3 (August 2012): 44–60. © 2012 CERN
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