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Article
Report number arXiv:1509.00294 ; CERN-PH-EP-2015-172 ; CERN-PH-EP-2015-172
Title Search for single top-quark production via flavour changing neutral currents at 8 TeV with the ATLAS detector
Related titleSearch for single top-quark production via flavour changing neutral currents at 8 TeV with the ATLAS detector
Author(s) ATLAS Collaboration  Prikaži svih 2876 autora
Publication 2016-01-29
Imprint 1 Sep 2015
Number of pages 30
Note 29 pages plus the Autors list and cover page (45 pages in total), 10 figures, 3 tables, submitted to EPJC, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2014-13/
In: Eur. Phys. J. C 76 (2016) pp.55
DOI 10.1140/epjc/s10052-016-3876-4
10.1140/epjc/s10052-021-09929-5 (erratum)
Subject category Particle Physics - Experiment
Accelerator/Facility, Experiment CERN LHC ; ATLAS
Free keywords flavor physics ; exotics ; top physics ; branching fraction ; experimental results
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 8TeV8TeV and corresponding to an integrated luminosity of 20.3fb120.3fb1 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 tWbtWb branching fraction is set. The observed 95%95% CL limit is σqgt×B(tWb)<3.4pbσqgt×B(tWb)<3.4pb and the expected 95%95% CL limit is σqgt×B(tWb)<2.9pbσqgt×B(tWb)<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<5.8×103TeV1κugt/Λ<5.8×103TeV1 and κcgt/Λ<13×103TeV1κcgt/Λ<13×103TeV1 and on the branching fractions B(tug)<4×105B(tug)<4×105 and B(tcg)<17×105B(tcg)<17×105.
Copyright/License publication: © 2016-2024 CERN (License: CC-BY-4.0), sponsored by SCOAP³
preprint: © 2015-2024 CERN (License: CC-BY-3.0)



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Email contact: a_ciocio@lbl.gov


 Zapis kreiran 2015-08-31, zadnja izmjena 2024-04-19


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