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
- Institución
- Universidad Nacional de La Plata
- OAI Identificador
- oai:sedici.unlp.edu.ar:10915/80326
Ver los metadatos del registro completo
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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:UNLP2025-09-29T11:14:46Zoai: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:13292025-09-29 11:14:47.152SEDICI (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 |
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http://sedici.unlp.edu.ar/handle/10915/80326 |
dc.language.none.fl_str_mv |
eng |
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eng |
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info:eu-repo/semantics/altIdentifier/issn/0370-2693 info:eu-repo/semantics/altIdentifier/doi/10.1016/j.physletb.2012.08.011 |
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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) |
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openAccess |
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http://creativecommons.org/licenses/by-nc-nd/4.0/ Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) |
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