INVESTIGADORES
MONTICELLI Fernando Gabriel
artículos
Título:
Search for anomaly-mediated supersymmetry breaking with the ATLAS detector based on a disappearing-track signature in pp collisions at √s = 7 TeV
Autor/es:
ATLAS COLLABORATION, G. AAD, F. MONTICELLI, ET AL
Revista:
EUROPEAN PHYSICAL JOURNAL C - PARTICLES AND FIELDS
Editorial:
SPRINGER
Referencias:
Lugar: Berlin; Año: 2012 vol. 213 p. 1 - 23
ISSN:
1434-6044
Resumen:
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.