Home > Research > Publications & Outputs > Search for FCNC single top-quark production at ...

Electronic data

  • 1-s2.0-S0370269312005394-main

    Rights statement: This article is published Open Access at sciencedirect.com. It is distributed under the terms of the Creative Commons Attribution License 3.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are credited.

    Final published version, 1.25 MB, PDF document

    Available under license: CC BY

Links

Text available via DOI:

View graph of relations

Search for FCNC single top-quark production at root s=7 TeV with the ATLAS detector

Research output: Contribution to journalJournal article

Published
  • The ATLAS collaboration
Close
<mark>Journal publication date</mark>12/06/2012
<mark>Journal</mark>Physics Letters B
Issue number4-5
Volume712
Number of pages19
Pages (from-to)351-369
Publication statusPublished
Original languageEnglish

Abstract

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 -> Wb branching fraction is measured to be sigma(qg -> t) x B(t -> Wb) < 3.9 pb. This upper limit is converted using a model-independent approach into upper limits on the coupling strengths kappa(ugt)/Lambda < 6.9.10(-3) TeV-1 and kappa(cgt)/Lambda < 1.6.10(-2) TeV-1, where A is the new physics scale, and on the branching fractions B(t -> ug) < 5.7.10(-5) and B(t -> cg) < 2.7.10(-4).

Bibliographic note

This article is published Open Access at sciencedirect.com. It is distributed under the terms of the Creative Commons Attribution License 3.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are credited.