TY  - JOUR
T1  - Search for anomaly-mediated supersymmetry breaking with the ATLAS detector based on a disappearing-track signature in pp collisions at √s=7 TeV
JF  - The European Physical Journal C
N2  - In models of anomaly-mediated supersymmetry breaking (AMSB), the lightest chargino is predicted to have a lifetime long enough to be detected in collider experiments. This letter explores AMSB scenarios in pp collisions at √s=7 TeV by attempting to identify decaying charginos which result in tracks that appear 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 1.02 fb\(^{−1}\) collected with the ATLAS detector in 2011. The p\(_T\) spectrum of candidate tracks is found to be consistent with the expectation from Standard Model background processes and constraints on the lifetime and the production cross section were obtained. In the minimal AMSB framework with m\(_{3/2}\)<32 TeV, m\(_0\)<1.5 TeV, tanβ=5 and μ>0, a chargino having mass below 92 GeV and a lifetime between 0.5 ns and 2 ns is excluded at 95 % confidence level.
KW  - chargino decay
KW  - anomaly mediation
KW  - supersymmetry
KW  - symmetry breaking
KW  - scattering
KW  - chargino lifetime
KW  - sparticle cascade decay
KW  - chargino mass
KW  - track data analysis
KW  - transverse momentum momentum spectrum
KW  - background
KW  - Monte Carlo
KW  - experimental results
KW  - sparticle pair production
KW  - chargino --> neutralino pi
KW  - CERN LHC Coll
KW  - ATLAS
KW  - 7000 GeV-cms
Y1  - 2012
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-127850
VL  - 72
IS  - 1993
ER  -