Search for FCNC single top-quark production at root s=7 TeV with the ATLAS detector
Popovic, D. S.
Vranješ Milosavljević, Marija
ATLAS Collaboration (ukupan broj autora: 3042)
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A search for the production of single top-quarks via flavour-changing neutral-currents is presented. Data collected with the ATLAS detector at a centre-of-mass energy of root s = 7 TeV, corresponding to an integrated luminosity of 2.05 fb(-1), are used. Candidate events with a semileptonic top-quark decay signature are classified as signal- or background-like events by using several kinematic variables as input to a neural network. No signal is observed in the neural network output distribution and a Bayesian upper limit is placed on the production cross-section. The observed upper limit at 95% confidence level on the cross-section multiplied by the t - GT Wb branching fraction is measured to be sigma(qg - GT t) x B(t - GT Wb) LT 3.9 pb. This upper limit is converted using a model-independent approach into upper limits on the coupling strengths kappa(ugt)/Lambda LT 6.9.10(-3) TeV-1 and kappa(cgt)/Lambda LT 1.6.10(-2) TeV-1, where A is the new physics scale, and on the branching fractio...ns B(t - GT ug) LT 5.7.10(-5) and B(t - GT cg) LT 2.7.10(-4). (C) 2012 CERN. Published by Elsevier B.V. All rights reserved.
Keywords:Top physics / Heavy-quark production / FCNC / Single top quark
Source:Physics Letters B, 2012, 712, 4-5, 351-369
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