INVESTIGADORES
MONTICELLI Fernando Gabriel
artículos
Título:
A search for flavour changing neutral currents in top-quark decays in pp collision data collected with the ATLAS detector at √s = 7 TeV
Autor/es:
ATLAS COLLABORATION, G. AAD, F. MONTICELLI, ET AL
Revista:
JOURNAL OF HIGH ENERGY PHYSICS
Editorial:
SPRINGER
Referencias:
Lugar: Berlin; Año: 2012 vol. 213 p. 1 - 23
ISSN:
1126-6708
Resumen:
A search for flavour changing neutral current (FCNC)
processes in top-quark decays by the ATLAS Collaboration is presented.
Data collected from pp collisions at the LHC at a centre-of-mass energy
of sqrt(s) = 7 TeV during 2011, corresponding to an integrated
luminosity of 2.1 fb^-1, were used. A search was performed for top-quark
pair-production events, with one top quark decaying through the
t->Zq FCNC (q=u,c) channel, and the other through the Standard Model
dominant mode t->Wb. Only the decays of the Z boson to charged
leptons and leptonic W-boson decays were considered as signal.
Consequently, the final-state topology is characterised by the presence
of three isolated charged leptons, at least two jets and missing
transverse momentum from the undetected neutrino. No evidence for an
FCNC signal was found. An upper limit on the t->Zq branching ratio of
BR(t->Zq)<0.73% is set at the 95% confidence level.