Search for direct stop production in events with missing transverse momentum and two b-jets using 12.8 fb^{-1} of pp collisions at sqrt{s} = 8 TeV with the ATLAS detector

The results of the search for direct pair production of bottom squarks presented in ATLAS-CONF-2012-165 are reinterpreted in terms of direct pair production of top squarks decaying into a bottom quark and a chargino. The dataset used corresponds to an integrated luminosity of 12.8 fb−1 of pp collisions at s√=8~TeV recorded by the ATLAS detector at the LHC. Assuming that the mass difference between the chargino and the lightest neutralino is small (~<5 GeV), top squarks with masses <580 GeV are excluded for m (neutralino) =100 and neutralino masses up to 300 GeV are excluded for m(stop) =500 GeV. In the case of a larger mass differences (<20 GeV) the top squark and neutralino mass limits weaken by 100 GeV and 50 GeV, respectively.