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Search for single top-quark production via flavour-changing neutral currents at 8 TeV with the ATLAS detector

ContributorsATLAS Collaboration
Collection
  • Open Access - SCOAP3
Publication date2016
Abstract

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 8 TeV 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 σqg→t×B(t→Wb)<3.4pb and the expected 95 % CL limit is σqg→t×B(t→Wb)<2.9pb . The observed limit can be interpreted as upper limits on the coupling constants of the flavour-changing neutral current interactions divided by the scale of new physics κugt/Λ<5.8×10-3TeV-1 and κcgt/Λ<13×10-3TeV and on the branching fractions B(t→ug)<4.0×10-5 and B(t→cg)<20×10-5 .

Citation (ISO format)
ATLAS Collaboration. Search for single top-quark production via flavour-changing neutral currents at 8 TeV with the ATLAS detector. In: European physical journal. C, Particles and fields, 2016, vol. 76, n° 2, p. 55. doi: 10.1140/epjc/s10052-016-3876-4
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Article (Published version)
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ISSN of the journal1434-6044
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