Evidence for the associated production of a W boson and a top quark in ATLAS at √s = 7 TeV

Autores
Anduaga, Xabier Sebastián; Dova, María Teresa; Monticelli, Fernando Gabriel; Tripiana, Martín F.; The ATLAS Collaboration
Año de publicación
2012
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
This Letter presents evidence for the associated production of a W boson and a top quark using 2.05 fb-1 of pp collision data at √s = 7 TeV accumulated with the ATLAS detector at the LHC. The analysis is based on the selection of the dileptonic final states with events featuring two isolated leptons, electron or muon, with significant transverse missing momentum and at least one jet. An approach based on boosted decision trees has been developed to improve the discrimination of single top-quark Wt events from background. A template fit to the final classifier distributions is performed to determine the cross-section. The result is incompatible with the background-only hypothesis at the 3.3σ level, the expected sensitivity assuming the Standard Model production rate being 3.4σ . The corresponding cross-section is determined and found to be σWt = 16.8 ± 2.9 (stat) ± 4.9 (syst) pb, in good agreement with the Standard Model expectation. From this result the CKM matrix element |Vtb|=1.03+0.16-0.19 is derived assuming that the Wt production through |Vts| and |Vtd| is small.
Facultad de Ciencias Exactas
Materia
Ciencias Exactas
Física
ATLAS detector
top quark
w boson
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by-nc-nd/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/80326
Acceder
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oai_identifier_str oai:sedici.unlp.edu.ar:10915/80326
network_acronym_str SEDICI
repository_id_str 1329
network_name_str SEDICI (UNLP)
spelling Evidence for the associated production of a W boson and a top quark in ATLAS at √s = 7 TeVAnduaga, Xabier SebastiánDova, María TeresaMonticelli, Fernando GabrielTripiana, Martín F.The ATLAS CollaborationCiencias ExactasFísicaATLAS detectortop quarkw bosonThis Letter presents evidence for the associated production of a W boson and a top quark using 2.05 fb<sup>-1</sup> of pp collision data at √s = 7 TeV accumulated with the ATLAS detector at the LHC. The analysis is based on the selection of the dileptonic final states with events featuring two isolated leptons, electron or muon, with significant transverse missing momentum and at least one jet. An approach based on boosted decision trees has been developed to improve the discrimination of single top-quark Wt events from background. A template fit to the final classifier distributions is performed to determine the cross-section. The result is incompatible with the background-only hypothesis at the 3.3σ level, the expected sensitivity assuming the Standard Model production rate being 3.4σ . The corresponding cross-section is determined and found to be σ<sub>Wt</sub> = 16.8 ± 2.9 (stat) ± 4.9 (syst) pb, in good agreement with the Standard Model expectation. From this result the CKM matrix element |V<sub>tb</sub>|=1.03<sup>+0.16</sup><sub>-0.19</sub> is derived assuming that the Wt production through |V<sub>ts</sub>| and |V<sub>td</sub>| is small.Facultad de Ciencias Exactas2012-08-09info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf142-159http://sedici.unlp.edu.ar/handle/10915/80326enginfo:eu-repo/semantics/altIdentifier/issn/0370-2693info:eu-repo/semantics/altIdentifier/doi/10.1016/j.physletb.2012.08.011info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-nd/4.0/Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-10-22T16:55:36Zoai:sedici.unlp.edu.ar:10915/80326Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-10-22 16:55:36.585SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Evidence for the associated production of a W boson and a top quark in ATLAS at √s = 7 TeV
title Evidence for the associated production of a W boson and a top quark in ATLAS at √s = 7 TeV
spellingShingle Evidence for the associated production of a W boson and a top quark in ATLAS at √s = 7 TeV
Anduaga, Xabier Sebastián
Ciencias Exactas
Física
ATLAS detector
top quark
w boson
title_short Evidence for the associated production of a W boson and a top quark in ATLAS at √s = 7 TeV
title_full Evidence for the associated production of a W boson and a top quark in ATLAS at √s = 7 TeV
title_fullStr Evidence for the associated production of a W boson and a top quark in ATLAS at √s = 7 TeV
title_full_unstemmed Evidence for the associated production of a W boson and a top quark in ATLAS at √s = 7 TeV
title_sort Evidence for the associated production of a W boson and a top quark in ATLAS at √s = 7 TeV
dc.creator.none.fl_str_mv Anduaga, Xabier Sebastián
Dova, María Teresa
Monticelli, Fernando Gabriel
Tripiana, Martín F.
The ATLAS Collaboration
author Anduaga, Xabier Sebastián
author_facet Anduaga, Xabier Sebastián
Dova, María Teresa
Monticelli, Fernando Gabriel
Tripiana, Martín F.
The ATLAS Collaboration
author_role author
author2 Dova, María Teresa
Monticelli, Fernando Gabriel
Tripiana, Martín F.
The ATLAS Collaboration
author2_role author
author
author
author
dc.subject.none.fl_str_mv Ciencias Exactas
Física
ATLAS detector
top quark
w boson
topic Ciencias Exactas
Física
ATLAS detector
top quark
w boson
dc.description.none.fl_txt_mv This Letter presents evidence for the associated production of a W boson and a top quark using 2.05 fb<sup>-1</sup> of pp collision data at √s = 7 TeV accumulated with the ATLAS detector at the LHC. The analysis is based on the selection of the dileptonic final states with events featuring two isolated leptons, electron or muon, with significant transverse missing momentum and at least one jet. An approach based on boosted decision trees has been developed to improve the discrimination of single top-quark Wt events from background. A template fit to the final classifier distributions is performed to determine the cross-section. The result is incompatible with the background-only hypothesis at the 3.3σ level, the expected sensitivity assuming the Standard Model production rate being 3.4σ . The corresponding cross-section is determined and found to be σ<sub>Wt</sub> = 16.8 ± 2.9 (stat) ± 4.9 (syst) pb, in good agreement with the Standard Model expectation. From this result the CKM matrix element |V<sub>tb</sub>|=1.03<sup>+0.16</sup><sub>-0.19</sub> is derived assuming that the Wt production through |V<sub>ts</sub>| and |V<sub>td</sub>| is small.
Facultad de Ciencias Exactas
description This Letter presents evidence for the associated production of a W boson and a top quark using 2.05 fb<sup>-1</sup> of pp collision data at √s = 7 TeV accumulated with the ATLAS detector at the LHC. The analysis is based on the selection of the dileptonic final states with events featuring two isolated leptons, electron or muon, with significant transverse missing momentum and at least one jet. An approach based on boosted decision trees has been developed to improve the discrimination of single top-quark Wt events from background. A template fit to the final classifier distributions is performed to determine the cross-section. The result is incompatible with the background-only hypothesis at the 3.3σ level, the expected sensitivity assuming the Standard Model production rate being 3.4σ . The corresponding cross-section is determined and found to be σ<sub>Wt</sub> = 16.8 ± 2.9 (stat) ± 4.9 (syst) pb, in good agreement with the Standard Model expectation. From this result the CKM matrix element |V<sub>tb</sub>|=1.03<sup>+0.16</sup><sub>-0.19</sub> is derived assuming that the Wt production through |V<sub>ts</sub>| and |V<sub>td</sub>| is small.
publishDate 2012
dc.date.none.fl_str_mv 2012-08-09
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Articulo
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://sedici.unlp.edu.ar/handle/10915/80326
url http://sedici.unlp.edu.ar/handle/10915/80326
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/issn/0370-2693
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.physletb.2012.08.011
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-nd/4.0/
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)
dc.format.none.fl_str_mv application/pdf
142-159
dc.source.none.fl_str_mv reponame:SEDICI (UNLP)
instname:Universidad Nacional de La Plata
instacron:UNLP
reponame_str SEDICI (UNLP)
collection SEDICI (UNLP)
instname_str Universidad Nacional de La Plata
instacron_str UNLP
institution UNLP
repository.name.fl_str_mv SEDICI (UNLP) - Universidad Nacional de La Plata
repository.mail.fl_str_mv alira@sedici.unlp.edu.ar
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score 12.982451

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