Search for flavour-changing neutral current top-quark decays t → qZ in proton-proton collisions at √s = 13 TeV with the ATLAS detector

A search for flavour-changing neutral-current processes in top-quark decays is presented. Data collected with the ATLAS detector from proton-proton collisions at the Large Hadron Collider at a centre-of-mass energy of √s =13 TeV, corresponding to an integrated luminosity of 36.1 fb⁻¹, are analysed....

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Autores principales: Alconada Verzini, María Josefina, Alonso, Francisco, Arduh, Francisco Anuar, Dova, María Teresa, Hoya, Joaquín, Monticelli, Fernando Gabriel, Wahlberg, Hernán Pablo, The ATLAS Collaboration
Formato: Articulo
Lenguaje:Inglés
Publicado: 2018
Materias:
Ciencias Exactas
Física
Hadron-Hadron scattering (experiments)
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/125669
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-125669
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
Hadron-Hadron scattering (experiments)
spellingShingle Ciencias Exactas
Física
Hadron-Hadron scattering (experiments)
Alconada Verzini, María Josefina
Alonso, Francisco
Arduh, Francisco Anuar
Dova, María Teresa
Hoya, Joaquín
Monticelli, Fernando Gabriel
Wahlberg, Hernán Pablo
The ATLAS Collaboration
Search for flavour-changing neutral current top-quark decays t → qZ in proton-proton collisions at √s = 13 TeV with the ATLAS detector
topic_facet Ciencias Exactas
Física
Hadron-Hadron scattering (experiments)
description A search for flavour-changing neutral-current processes in top-quark decays is presented. Data collected with the ATLAS detector from proton-proton collisions at the Large Hadron Collider at a centre-of-mass energy of √s =13 TeV, corresponding to an integrated luminosity of 36.1 fb⁻¹, are analysed. The search is performed using top-quark pair events, with one top quark decaying through the t → qZ (q = u, c) flavour-changing neutral-current channel, and the other through the dominant Standard Model mode t → bW. Only Z boson decays into charged leptons and leptonic W boson decays are considered as signal. Consequently, the final-state topology is characterized by the presence of three isolated charged leptons (electrons or muons), at least two jets, one of the jets originating from a b-quark, and missing transverse momentum from the undetected neutrino. The data are consistent with Standard Model background contributions, and at 95% confidence level the search sets observed (expected) upper limits of 1.7 × 10⁻⁴ (2.4 × 10⁻⁴ on the t → uZ branching ratio and 2.4 × 10⁻⁴ (3.2 × 10⁻⁴) on the t → cZ branching ratio, constituting the most stringent limits to date.
format Articulo
Articulo
author Alconada Verzini, María Josefina
Alonso, Francisco
Arduh, Francisco Anuar
Dova, María Teresa
Hoya, Joaquín
Monticelli, Fernando Gabriel
Wahlberg, Hernán Pablo
The ATLAS Collaboration
author_facet Alconada Verzini, María Josefina
Alonso, Francisco
Arduh, Francisco Anuar
Dova, María Teresa
Hoya, Joaquín
Monticelli, Fernando Gabriel
Wahlberg, Hernán Pablo
The ATLAS Collaboration
author_sort Alconada Verzini, María Josefina
title Search for flavour-changing neutral current top-quark decays t → qZ in proton-proton collisions at √s = 13 TeV with the ATLAS detector
title_short Search for flavour-changing neutral current top-quark decays t → qZ in proton-proton collisions at √s = 13 TeV with the ATLAS detector
title_full Search for flavour-changing neutral current top-quark decays t → qZ in proton-proton collisions at √s = 13 TeV with the ATLAS detector
title_fullStr Search for flavour-changing neutral current top-quark decays t → qZ in proton-proton collisions at √s = 13 TeV with the ATLAS detector
title_full_unstemmed Search for flavour-changing neutral current top-quark decays t → qZ in proton-proton collisions at √s = 13 TeV with the ATLAS detector
title_sort search for flavour-changing neutral current top-quark decays t → qz in proton-proton collisions at √s = 13 tev with the atlas detector
publishDate 2018
url http://sedici.unlp.edu.ar/handle/10915/125669
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