Search for anomaly-mediated supersymmetry breaking with the ATLAS detector based on a disappearing-track signature in pp collisions at $$\sqrt{s} = 7~\mathrm{TeV}$$
Journal Article
·
· European Physical Journal. C, Particles and Fields
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 (Formula Presented) = 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 β = 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.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- Contributing Organization:
- The ATLAS Collaboration
- Grant/Contract Number:
- AC02-05CH11231
- OSTI ID:
- 1409402
- Alternate ID(s):
- OSTI ID: 1838746
OSTI ID: 21573554
- Journal Information:
- European Physical Journal. C, Particles and Fields, Journal Name: European Physical Journal. C, Particles and Fields Journal Issue: 4 Vol. 72; ISSN 1434-6044
- Publisher:
- SpringerCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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Thu Jan 17 19:00:00 EST 2013
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OSTI ID:1462393
Search for charginos nearly mass degenerate with the lightest neutralino based on a disappearing-track signature in pp collisions at =8 TeV with the ATLAS detector
Dataset
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Tue Oct 01 00:00:00 EDT 2013
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OSTI ID:1893151