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

Abstract

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 sqrt(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 pT 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, tan(beta) = 5 and mu > 0, a chargino having mass below 92 GeV and a lifetime between 0.5 ns and 2 ns is excluded at 95% confidence level.

7 pages plus author list (20 pages total), 8 figures, 2 tables, revised author list, matches Eur. Phys. J. C version

References in corpus (4)

• Herwig++ Physics and Manual
• Jet energy measurement with the ATLAS detector in proton-proton collisions at sqrt(s) = 7 TeV
• Parton Distributions for LO Generators
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Cited by in corpus (13)

• Mini-Split
• 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
• Collider Searches for Long-Lived Particles Beyond the Standard Model
• Displaced Supersymmetry
• Constrained Supersymmetry after two years of LHC data: a global view with Fittino
• Pure Gravity Mediation of Supersymmetry Breaking at the LHC
• Vector Boson Fusion Processes as a Probe of Supersymmetric Electroweak Sectors at the LHC
• Multiple Gamma Lines from Semi-Annihilation
• Search for direct chargino production in anomaly-mediated supersymmetry breaking models based on a disappearing-track signature in pp collisions at sqrt(s)=7 TeV with the ATLAS detector
• Strictly Anomaly Mediated Supersymmetry Breaking
• Mitigation of the LHC Inverse Problem
• Supersymmetry Searches with ATLAS and CMS
• Gamma Ray and Neutrino Flux from Annihilation of Neutralino Dark Matter at Galactic Halo Region in mAMSB Model