El Cuerpo
Académico de Partículas Campos y Relatividad General invita
cordialmente a su próximo seminario
Dra. Arely Cortés
González
Universidad de Illinois, Urbana-Champaign
Este
seminario se llevará a cabo en la
Sala de Conferencias 111B/302
Facultad de Ciencias Físico Matemáticas – BUAP
Jueves 16 de agosto de 2012
12:00 hrs.
Resumen:
A search for flavor changing neutral current (FCNC)
processes in top-quark decays by the ATLAS Collaboration is presented. Data
collected from pp
collisions at the LHC with a center-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 --> Wq. Only decays of the Z-boson to charged leptons and leptonic W-boson
decays were considered as signal. Consequently, the final-state topology is
characterized 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.