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

Journal Article · Fri Apr 27 04:00:00 EDT 2012 · The European Physical Journal, C

OSTI ID:1046998

Aad, G; Abbott, B; Abdallah, J; Abdelalim, AA; Abdesselam, A; Abdinov, O; Abi, B; Abolins, M; Abramowicz, H; Abreu, H; Acerbi, E; Acharya, BS; Adams, DL; Addy, TN; Adelman, J; Aderholz, M; Adomeit, S; Adragna, P; Adye, T; Aefsky, S ; Aguilar-Saavedra, JA

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 {radical}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{sup -1} collected with the ATLAS detector in 2011. The p{sub 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{sub 3/2} < 32 TeV, m{sub 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.

• Research Organization: BROOKHAVEN NATIONAL LABORATORY (BNL)
• Sponsoring Organization: USDOE SC OFFICE OF SCIENCE (SC)
• DOE Contract Number: AC02-98CH10886
• OSTI ID: 1046998
• Report Number(s): BNL--98250-2012-JA; KA1101021
• Journal Information: The European Physical Journal, C, Journal Name: The European Physical Journal, C Journal Issue: 4 Vol. 72; ISSN 1434-6044
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CROSS SECTIONS
LIFETIME
LUMINOSITY
PRODUCTION
STANDARD MODEL
SUPERSYMMETRY