Study of ATLAS sensitivity to FCNC top quark decays

摘要

A likelihood-based analysis was developed to study the ATLASexperiment sensitivity to top quark Flavour-Changing Neutral-Current (FCNC) de-cays at LHC using tt events. One of the top quarks was considered to decay throughthe dominant Standard Model (SM) channel (t → bW), while the other decays viaFCNC (t → qX, X = Z or g). The expected sensitivity for the first 1 fb~(-1)ofdata is presented as the 95% confidence level limits on the branching ratios (BR) inthe hypothesis of signal absence.