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Search for single top-quark production via flavour-changing neutral currents at 8TeV with the ATLAS detector
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.ORCID iD: 0000-0002-8913-0981
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Number of Authors: 2857
2016 (English)In: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 76, no 2, 55Article in journal (Refereed) Published
Abstract [en]

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) < 3.4 pb and the expected 95% CL limit is sigma(qg -> t) x B(t -> Wb) < 2.9 pb. 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 kappa(ugt)/Lambda < 5.8 x 10(-3) TeV-1 and kappa(cgt)/Lambda < 13x10(-3) TeV and on the branching fractions B(t -> ug) < 4.0 x 10(-5) and B(t -> cg) < 20 x 10(-5).

Place, publisher, year, edition, pages
Springer-Verlag New York, 2016. Vol. 76, no 2, 55
Keyword [en]
Parton Distributions, Hadron Colliders, Doublet Models, Cross-Section, Root-S=7 Tev, Decays, Collisions, Lhc, Couplings, Standard
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-187897DOI: 10.1140/epjc/s10052-016-3876-4ISI: 000375277900001ScopusID: 2-s2.0-84958164056OAI: oai:DiVA.org:kth-187897DiVA: diva2:932080
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QC 20160531

Available from: 2016-05-31 Created: 2016-05-31 Last updated: 2016-05-31Bibliographically approved

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Lund-Jensen, BengtSidebo, EdvinStrandberg, Jonas
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