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Search for direct top squark pair production in final states with one isolated lepton, jets, and missing transverse momentum in $\sqrt{s}=7$ TeV $pp$ collisions using 4.7 $fb^{-1}$ of ATLAS data

The ATLAS collaboration
Phys.Rev.Lett. 109 (2012) 211803, 2012.

Abstract (data abstract)
CERN-LHC. A study of data from proton-proton collisions at a centre-of-mass energy of 7 TeV having final states consisting of one isolated electron or muon, jets and missing trasnverse momentum using a data sample of total integrated luminosity of 4.7 fb-1. Each event must have >=1 reconstructed primary vertex associated with five or more tracks with PT > 0.4 GeV. Events must have exactly one muon (or electron) with |eta|<2.4 (or 2.47) and pT > 20 (or 25) GeV and isolated from other particles. The scalar sum of the pT of tracks >1 GeV within a cone of size deltaR=0.2 around the lepton candidate is required to be < 10% of the electron pT, and <1.8 Gev for the muon. jets are reconstructed using the ant-kT clustering algorithm with radius parameter=0.4. Events with four or more jets with |eta|<2.5 and pT> 80,60,40,and 25 GeV are selected with at least one jet identified as a b-jet.

  • Table 1

    Data from F 1


    The observed and standard model prediction for the distribution of missing ET in signal region A.

  • Table 2

    Data from F3 (Auxiliary Plots)


    The observed 95% exclusion limits for the five signal regions.

  • Table 3

    Data from F3 (Auxiliary Plots)


    The expected 95% exclusion limits for the five signal regions.

  • Table 4

    Data from F 11,12 (Auxiliary Plots)


    The stop pair production cross section and its uncertainty due to PDF, factorization and the renormalization scales.

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