Evidence for the associated production of a W boson and a top quark in ATLAS at root s=7 TeV
Autor(a) principal: | |
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Data de Publicação: | 2012 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/1822/48799 |
Resumo: | This Letter presents evidence for the associated production of a W boson and a top quark using 2.05 fb−12.05 fb−1 of pp collision data at View the MathML sources=7TeV 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) pbσWt=16.8±2.9 (stat)±4.9 (syst) pb, in good agreement with the Standard Model expectation. From this result the CKM matrix element View the MathML source|Vtb|=1.03−0.19+0.16 is derived assuming that the Wt production through |Vts||Vts| and |Vtd||Vtd| is small. |
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Evidence for the associated production of a W boson and a top quark in ATLAS at root s=7 TeVATLASTop quarkW+tW+tSingle top-quarkW plus tCiências Naturais::Ciências FísicasCiências Naturais::Ciências FísicasScience & TechnologyThis Letter presents evidence for the associated production of a W boson and a top quark using 2.05 fb−12.05 fb−1 of pp collision data at View the MathML sources=7TeV 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) pbσWt=16.8±2.9 (stat)±4.9 (syst) pb, in good agreement with the Standard Model expectation. From this result the CKM matrix element View the MathML source|Vtb|=1.03−0.19+0.16 is derived assuming that the Wt production through |Vts||Vts| and |Vtd||Vtd| is small.We acknowledge the support of ANPCyT, Argentina; YerPhl, Armenia; ARC, Australia; BMWF, Austria; ANAS, Azerbaijan; SSTC, Belarus; CNPq and FAPESP, Brazil; NSERC, NRC and CFI, Canada; CERN; CONICYT, Chile; CAS, MOST and NSFC, China; COLCIENCIAS, Colombia; MSMT CR, MPO CR and VSC CR, Czech Republic; DNRF, DNSRC and Lundbeck Foundation, Denmark; EPLANET and ERC, European Union; IN2P3-CNRS, CEA-DSM/IRFU, France; GNAS, Georgia; BMBF, DFG, HGF, MPG and AvH Foundation, Germany; GSRT, Greece; ISF, MINERVA, GIF, DIP and Benoziyo Center, Israel; INFN, Italy; MEXT and JSPS, Japan; CNRST, Morocco; FOM and NWO, Netherlands; RCN, Norway; MNiSW, Poland; GRICES and FCT, Portugal; MERYS (MECTS), Romania; MES of Russia and ROSATOM, Russian Federation; JINR; MSTD, Serbia; MSSR, Slovakia; ARRS and MVZT, Slovenia; DST/NRF, South Africa; MICINN, Spain; SRC and Wallenberg Foundation, Sweden; SER, SNSF and Cantons of Bern and Geneva, Switzerland; NSC, Taiwan; TAEK, Turkey; STFC, the Royal Society and Leverhulme Trust, United Kingdom; DOE and NSF, United States of America.info:eu-repo/semantics/publishedVersionElsevierUniversidade do MinhoOnofre, A.Castro, Nuno Filipe Silva FernandesATLAS Collaboration20122012-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/1822/48799engAad, G., Abbott, B., Abdallah, J., Khalek, S. A., Abdelalim, A. A., Abdinov, O., . . . Collaboration, A. (2012). Evidence for the associated production of a W boson and a top quark in ATLAS at root s=7 TeV. Physics Letters B, 716(1), 142-159. doi: 10.1016/j.physletb.2012.08.0110370-26931873-244510.1016/j.physletb.2012.08.011http://www.sciencedirect.com/science/article/pii/S0370269312008489info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-07-21T12:17:46Zoai:repositorium.sdum.uminho.pt:1822/48799Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T19:10:26.950651Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Evidence for the associated production of a W boson and a top quark in ATLAS at root s=7 TeV |
title |
Evidence for the associated production of a W boson and a top quark in ATLAS at root s=7 TeV |
spellingShingle |
Evidence for the associated production of a W boson and a top quark in ATLAS at root s=7 TeV Onofre, A. ATLAS Top quark W+tW+t Single top-quark W plus t Ciências Naturais::Ciências Físicas Ciências Naturais::Ciências Físicas Science & Technology |
title_short |
Evidence for the associated production of a W boson and a top quark in ATLAS at root s=7 TeV |
title_full |
Evidence for the associated production of a W boson and a top quark in ATLAS at root s=7 TeV |
title_fullStr |
Evidence for the associated production of a W boson and a top quark in ATLAS at root s=7 TeV |
title_full_unstemmed |
Evidence for the associated production of a W boson and a top quark in ATLAS at root s=7 TeV |
title_sort |
Evidence for the associated production of a W boson and a top quark in ATLAS at root s=7 TeV |
author |
Onofre, A. |
author_facet |
Onofre, A. Castro, Nuno Filipe Silva Fernandes ATLAS Collaboration |
author_role |
author |
author2 |
Castro, Nuno Filipe Silva Fernandes ATLAS Collaboration |
author2_role |
author author |
dc.contributor.none.fl_str_mv |
Universidade do Minho |
dc.contributor.author.fl_str_mv |
Onofre, A. Castro, Nuno Filipe Silva Fernandes ATLAS Collaboration |
dc.subject.por.fl_str_mv |
ATLAS Top quark W+tW+t Single top-quark W plus t Ciências Naturais::Ciências Físicas Ciências Naturais::Ciências Físicas Science & Technology |
topic |
ATLAS Top quark W+tW+t Single top-quark W plus t Ciências Naturais::Ciências Físicas Ciências Naturais::Ciências Físicas Science & Technology |
description |
This Letter presents evidence for the associated production of a W boson and a top quark using 2.05 fb−12.05 fb−1 of pp collision data at View the MathML sources=7TeV 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) pbσWt=16.8±2.9 (stat)±4.9 (syst) pb, in good agreement with the Standard Model expectation. From this result the CKM matrix element View the MathML source|Vtb|=1.03−0.19+0.16 is derived assuming that the Wt production through |Vts||Vts| and |Vtd||Vtd| is small. |
publishDate |
2012 |
dc.date.none.fl_str_mv |
2012 2012-01-01T00:00:00Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/1822/48799 |
url |
http://hdl.handle.net/1822/48799 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Aad, G., Abbott, B., Abdallah, J., Khalek, S. A., Abdelalim, A. A., Abdinov, O., . . . Collaboration, A. (2012). Evidence for the associated production of a W boson and a top quark in ATLAS at root s=7 TeV. Physics Letters B, 716(1), 142-159. doi: 10.1016/j.physletb.2012.08.011 0370-2693 1873-2445 10.1016/j.physletb.2012.08.011 http://www.sciencedirect.com/science/article/pii/S0370269312008489 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Elsevier |
publisher.none.fl_str_mv |
Elsevier |
dc.source.none.fl_str_mv |
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