The results of a search for pair production of the lighter scalar partners of top quarks (t~1) in 2.05 fb -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 (χ~10) is the next-to-lightest supersymmetric particle. Scalar top quark masses up to 310 GeV are excluded for 115GeV <230GeV at 95% confidence level, reaching an exclusion of mt~1<330GeV for mχ~10=190GeV. Scalar top quark masses below 240 GeV are excluded for all values of mχ~10>mZ. © 2012 CERN.
CITATION STYLE
Aad, G., Abbott, B., Abdallah, J., Abdel Khalek, S., Abdelalim, A. A., Abdinov, O., … Zwalinski, L. (2012). Search for scalar top quark pair production in natural gauge mediated supersymmetry models with the ATLAS detector in pp collisions at s=7TeV. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 715(1–3), 44–60. https://doi.org/10.1016/j.physletb.2012.07.010
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