Abstract
We present an update of a search for supersymmetry in final states containing jets, missing transverse momentum, and one isolated electron or muon, using 1.04 fb^-1 of proton-proton collision data at sqrt{s} = 7 TeV recorded by the ATLAS experiment at the LHC in the first half of 2011. The analysis is carried out in four distinct signal regions with either three or four jets and variations on the (missing) transverse momentum cuts, resulting in optimized limits for various supersymmetry models. No excess above the standard model background expectation is observed. Limits are set on the visible cross-section of new physics within the kinematic requirements of the search. The results are interpreted as limits on the parameters of the minimal supergravity framework, limits on cross-sections of simplified models with specific squark and gluino decay modes, and limits on parameters of a model with bilinear R-parity violation.
Highlights
AND ANALYSIS OVERVIEWMany extensions of the standard model predict the existence of new colored particles, such as the squarks (q~) and gluinos (g~) of supersymmetric (SUSY) theories [1], which could be accessible at the LHC
We present an update of a search for supersymmetry in final states containing jets, missing transverse pmffisoffi m1⁄4en7tuTmeV, and one recorded isolated electron or muon, by the ATLAS experiment using at the
This paper reports on an update of a search for events with exactly one isolated high-transverse momentum electron or muon, at least three high-pT jets, and significant missing transverse momentum (EmT iss), using data collected by ATLAS
Summary
Many extensions of the standard model predict the existence of new colored particles, such as the squarks (q~) and gluinos (g~) of supersymmetric (SUSY) theories [1], which could be accessible at the LHC. LHC results of searches for SUSY with 35 pbÀ1 of data collected in 2010, in final states with zero, one, or two leptons (where leptons refer to either electrons or muons), can be found in Refs [3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18]. The control regions normalize the backgrounds from W and tt" production To estimate these backgrounds in the signal regions, an extrapolation of the individual background components from the control to the signal regions is performed. The cut optimization was performed in the MSUGRA/CMSSM (minimal supergravity/ constrained minimal supersymmetric standard model) framework [20,21], and for simplified models characterizing specific SUSY production and decay modes. The results are interpreted in these MSUGRA/CMSSM and simplified model frameworks, as well as in a model with bilinear R-parity violation (bRPV) [22]
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