Search for scalar top quark pair production in natural gauge mediated supersymmetry models with the ATLAS detector in <em>pp</em> collisions at √s=7  TeV

ATLAS Collaboration

doi:10.1016/j.physletb.2012.07.010

Scientific article

English

Search for scalar top quark pair production in natural gauge mediated supersymmetry models with the ATLAS detector in pp collisions at √s=7 TeV

Contributors

ATLAS Collaboration

Published in

Physics letters. B, vol. 715, no. 1-3, p. 44-60

Publication date

2012

Abstract

The results of a search for pair production of the lighter scalar partners of top quarks (˜t1) 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 0 1) is the next-to-lightest supersymmetric particle. Scalar top quark masses up to 310 GeV are excluded for 115 GeV < m χ 0 1< 230 GeV at 95% confidence level, reaching an exclusion of mt1 < 330 GeV for m ˜χ 0 1 = 190 GeV. Scalar top quark masses below 240 GeV are excluded for all values of m ˜χ 0 1>mZ.

UNIGE affiliation entities

Faculté des sciences / Section de physique / Département de physique nucléaire et corpusculaire

Citation (ISO format)

ATLAS Collaboration. Search for scalar top quark pair production in natural gauge mediated supersymmetry models with the ATLAS detector in pp collisions at √s=7 TeV. In: Physics letters. B, 2012, vol. 715, n° 1-3, p. 44–60. doi: 10.1016/j.physletb.2012.07.010

Article (Published version)

Identifiers

PID : unige:39873
DOI : 10.1016/j.physletb.2012.07.010

Additional URL for this publication

http://www.sciencedirect.com/science/article/pii/S0370269312007502#

Journal ISSN

0370-2693

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