Search for single top-quark production via flavour-changing neutral currents at 8TeV with the ATLAS detector
2016
Abstrakt
A search for single top-quark production via flavour-changing neutral current processes from gluon plus up- or charm-quark initial states in proton-proton collisions at the LHC is presented. Data collected with the ATLAS detector in 2012 at a centre-of-mass energy of 8TeV and corresponding to an integrated luminosity of 20.3 fb(-1) are used.
Candidate events for a top quark decaying into a lepton, a neutrino and a jet are selected and classified into signal- and background-like candidates using a neural network. No signal is observed and an upper limit on the production cross-section multiplied by the t -> Wb branching fraction is set.
The observed 95% CL limit is sigma(qg -> t) x B(t -> Wb) t) x B(t -> Wb) ug) cg) < 20 x 10(-5).