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In models of anomaly-mediated supersymmetry breaking (AMSB), the lightestchargino is predicted to have a lifetime long enough to be detected in colliderexperiments. This letter explores AMSB scenarios in pp collisions at sqrt(s) =7 TeV by attempting to identify decaying charginos which result in tracks thatappear to have few associated hits in the outer region of the tracking system.The search was based on data corresponding to an integrated luminosity of 1.02fb^-1 collected with the ATLAS detector in 2011. The pT spectrum of candidatetracks is found to be consistent with the expectation from Standard Modelbackground processes and constraints on the lifetime and the production crosssection were obtained. In the minimal AMSB framework with m_3/2 < 32 TeV, m_0 <1.5 TeV, tan(beta) = 5 and mu > 0, a chargino having mass below 92 GeV and alifetime between 0.5 ns and 2 ns is excluded at 95% confidence level.

european physical journal. c, particles and fields

Search for anomaly-mediated supersymmetry breaking with the ATLAS  detector based on a disappearing-track signature in pp collisions at sqrt(s)  = 7 TeV