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A search is presented for direct chargino production based on adisappearing-track signature using 20.3 fb-1 of proton-proton collisions atsqrt(s) = 8 TeV collected with the ATLAS experiment at the LHC. Inanomaly-mediated supersymmetry breaking (AMSB) models, the lightest chargino isnearly mass-degenerate with the lightest neutralino and its lifetime is longenough to be detected in the tracking detectors by identifying decays thatresult in tracks with no associated hits in the outer region of the trackingsystem. Some models with supersymmetry also predict charginos with asignificant lifetime. This analysis attains sensitivity for charginos with alifetime between 0.1 ns and 10 ns, and significantly surpasses the reach of theLEP experiments. No significant excess above the background expectation isobserved for candidate tracks with large transverse momentum, and constraintson chargino properties are obtained. In the AMSB scenarios, a chargino massbelow 270 GeV is excluded at 95% confidence level.

physical review. d. particles, fields, gravitation, and cosmology/physical review. d, particles, fields, gravitation, and cosmology

Search for charginos nearly mass-degenerate with the lightest neutralino  based on a disappearing-track signature in pp collisions at sqrt(s) = 8 TeV  with the ATLAS detector