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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Autores principales: Alconada Verzini, María Josefina, Alonso, Francisco, Arduh, Francisco Anuar, Dova, María Teresa, Monticelli, Fernando Gabriel, Wahlberg, Hernán Pablo, The ATLAS Collaboration
Formato: Articulo
Lenguaje:Inglés
Publicado: 2016
Materias:
Ciencias Exactas
Física
quarks
ATLAS detector
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/87008
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-87008
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Exactas
Física
quarks
ATLAS detector
spellingShingle Ciencias Exactas
Física
quarks
ATLAS detector
Alconada Verzini, María Josefina
Alonso, Francisco
Arduh, Francisco Anuar
Dova, María Teresa
Monticelli, Fernando Gabriel
Wahlberg, Hernán Pablo
The ATLAS Collaboration
Search for single top-quark production via flavour-changing neutral currents at 8 TeV with the ATLAS detector
topic_facet Ciencias Exactas
Física
quarks
ATLAS detector
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<sup>-1</sup> 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 σ<sub>qg→t</sub> × B(t → Wb) < 3.4 pb and the expected 95 % CL limit is σ<sub>qg→t</sub> × 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 κ<sub>ugt</sub> /Λ < 5.8 × 10<sup>-3</sup> TeV<sup>-1</sup> and κ<sub>cgt</sub> /Λ < 13×10<sup>-3</sup> TeV and on the branching fractions B(t → ug) < 4.0 × 10<sup>-5</sup> and B(t → cg) < 20 × 10<sup>-5</sup>.
format Articulo
Articulo
author Alconada Verzini, María Josefina
Alonso, Francisco
Arduh, Francisco Anuar
Dova, María Teresa
Monticelli, Fernando Gabriel
Wahlberg, Hernán Pablo
The ATLAS Collaboration
author_facet Alconada Verzini, María Josefina
Alonso, Francisco
Arduh, Francisco Anuar
Dova, María Teresa
Monticelli, Fernando Gabriel
Wahlberg, Hernán Pablo
The ATLAS Collaboration
author_sort Alconada Verzini, María Josefina
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
publishDate 2016
url http://sedici.unlp.edu.ar/handle/10915/87008
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AT wahlberghernanpablo searchforsingletopquarkproductionviaflavourchangingneutralcurrentsat8tevwiththeatlasdetector
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bdutipo_str Repositorios
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