Searches for heavy long-lived sleptons with the ATLAS detector in pp collisions at √s = 8 TeV

A search for long-lived sleptons has been performed on a data sample of 15.9 fb−1 of pp collisions at a center of mass energy of √s= 8 TeV collected by the ATLAS detector at LHC in 2012. Long-lived sleptons are expected to interact as if they were heavy muons, charged and penetrating. Results are interpreted in the context of gauge-mediated supersymmetry breaking (GMSB) models where the ˜ τ1, supersymmetric partner of the τ lepton, is the next to lightest supersymmetric particle (NLSP) and decays outside the ATLAS volume. No excess is observed above the estimated background, therefore lower limits, at 95% confidence level, are set on the mass of the long-lived sleptons.