Evidence for single top-quark production in the s-channel in proton–proton collisions at √s=8TeVwith the ATLAS detector using the Matrix Element Method

This Letter presents evidence for single top-quark production in the s-channel using proton–proton collisions at a centre-of-mass energy of 8TeVwith the ATLAS detector at the CERN Large Hadron Collider. The analysis is performed on events containing one isolated electron or muon, large missing trans...

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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:
Física
Large hadron collider
proton–proton collision
ATLAS detector
Matrix element method
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/78357
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-78357
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Física
Física
Large hadron collider
proton–proton collision
ATLAS detector
Matrix element method
spellingShingle Física
Física
Large hadron collider
proton–proton collision
ATLAS detector
Matrix element method
Alconada Verzini, María Josefina
Alonso, Francisco
Arduh, Francisco Anuar
Dova, María Teresa
Monticelli, Fernando Gabriel
Wahlberg, Hernán Pablo
The ATLAS Collaboration
Evidence for single top-quark production in the s-channel in proton–proton collisions at √s=8TeVwith the ATLAS detector using the Matrix Element Method
topic_facet Física
Física
Large hadron collider
proton–proton collision
ATLAS detector
Matrix element method
description This Letter presents evidence for single top-quark production in the s-channel using proton–proton collisions at a centre-of-mass energy of 8TeVwith the ATLAS detector at the CERN Large Hadron Collider. The analysis is performed on events containing one isolated electron or muon, large missing transverse momentum and exactly two b-tagged jets in the final state. The analysed data set corresponds to an integrated luminosity of 20.3fb−1. The signal is extracted using a maximum-likelihood fit of a discriminant which is based on the matrix element method and optimized in order to separate single-top-quark s-channel events from the main background contributions, which are top-quark pair production and Wboson production in association with heavy-flavour jets. The measurement leads to an observed signal significance of 3.2 standard deviations and a measured cross-section of σs=4.8 ±0.8(stat.)+1.6−1.3(syst.)pb, which is consistent with the Standard Model expectation. The expected significance for the analysis is 3.9 standard deviations.
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 Evidence for single top-quark production in the s-channel in proton–proton collisions at √s=8TeVwith the ATLAS detector using the Matrix Element Method
title_short Evidence for single top-quark production in the s-channel in proton–proton collisions at √s=8TeVwith the ATLAS detector using the Matrix Element Method
title_full Evidence for single top-quark production in the s-channel in proton–proton collisions at √s=8TeVwith the ATLAS detector using the Matrix Element Method
title_fullStr Evidence for single top-quark production in the s-channel in proton–proton collisions at √s=8TeVwith the ATLAS detector using the Matrix Element Method
title_full_unstemmed Evidence for single top-quark production in the s-channel in proton–proton collisions at √s=8TeVwith the ATLAS detector using the Matrix Element Method
title_sort evidence for single top-quark production in the s-channel in proton–proton collisions at √s=8tevwith the atlas detector using the matrix element method
publishDate 2016
url http://sedici.unlp.edu.ar/handle/10915/78357
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