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

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 in...

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Autor principal: Aad, G.
Formato: JOUR
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_14346044_v76_n2_p1_Aad
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_14346044_v76_n2_p1_Aad
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spelling todo:paper_14346044_v76_n2_p1_Aad2023-10-03T16:15:13Z Search for single top-quark production via flavour-changing neutral currents at 8 TeV with the ATLAS detector Aad, G. 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 (Formula presented.) 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 (Formula presented.) branching fraction is set. The observed 95 % CL limit is (Formula presented.) and the expected 95 % CL limit is (Formula presented.). 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 (Formula presented.) and (Formula presented.) and on the branching fractions (Formula presented.) and (Formula presented.). © 2016, CERN for the benefit of the ATLAS collaboration. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_14346044_v76_n2_p1_Aad
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description 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 (Formula presented.) 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 (Formula presented.) branching fraction is set. The observed 95 % CL limit is (Formula presented.) and the expected 95 % CL limit is (Formula presented.). 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 (Formula presented.) and (Formula presented.) and on the branching fractions (Formula presented.) and (Formula presented.). © 2016, CERN for the benefit of the ATLAS collaboration.
format JOUR
author Aad, G.
spellingShingle Aad, G.
Search for single top-quark production via flavour-changing neutral currents at 8 TeV with the ATLAS detector
author_facet Aad, G.
author_sort Aad, G.
title Search for single top-quark production via flavour-changing neutral currents at 8 TeV with the ATLAS detector
title_short Search for single top-quark production via flavour-changing neutral currents at 8 TeV with the ATLAS detector
title_full Search for single top-quark production via flavour-changing neutral currents at 8 TeV with the ATLAS detector
title_fullStr Search for single top-quark production via flavour-changing neutral currents at 8 TeV with the ATLAS detector
title_full_unstemmed Search for single top-quark production via flavour-changing neutral currents at 8 TeV with the ATLAS detector
title_sort search for single top-quark production via flavour-changing neutral currents at 8 tev with the atlas detector
url http://hdl.handle.net/20.500.12110/paper_14346044_v76_n2_p1_Aad
work_keys_str_mv AT aadg searchforsingletopquarkproductionviaflavourchangingneutralcurrentsat8tevwiththeatlasdetector
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