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Search for anomaly-mediated supersymmetry breaking with the ATLAS detector based on a disappearing-track signature in pp collisions at root s=7 TeV
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.ORCID iD: 0000-0002-8913-0981
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Number of Authors: 3019
2012 (English)In: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 72, no 4, 1993- p.Article in journal (Refereed) Published
Abstract [en]

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 root 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, 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.

Place, publisher, year, edition, pages
2012. Vol. 72, no 4, 1993- p.
Keyword [en]
Supergauge Transformations, Mass-Degenerate, Model, Generators, Charginos, Pions
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-96830DOI: 10.1140/epjc/s10052-012-1993-2ISI: 000304013800004Scopus ID: 2-s2.0-84862283979OAI: oai:DiVA.org:kth-96830DiVA: diva2:533167
Note

QC 20120613. Author count: 3019.

Available from: 2012-06-13 Created: 2012-06-13 Last updated: 2017-06-19Bibliographically approved

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Strandberg, Jonas

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