Evidence for the associated production of the Higgs boson and a top quark pair with the ATLAS detector
Autor(a) principal: | |
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Data de Publicação: | 2018 |
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/10400.26/27543 |
Resumo: | A search for the associated production of the Higgs boson with a top quark pair (tt¯H) is reported. The search is performed in multilepton final states using a data set corresponding to an integrated luminosity of 36.1 fb-1 of proton-proton collision data recorded by the ATLAS experiment at a center-of-mass energy s=13 TeV at the Large Hadron Collider. Higgs boson decays to WW*, ττ, and ZZ* are targeted. Seven final states, categorized by the number and flavor of charged-lepton candidates, are examined for the presence of the Standard Model Higgs boson with a mass of 125 GeV and a pair of top quarks. An excess of events over the expected background from Standard Model processes is found with an observed significance of 4.1 standard deviations, compared to an expectation of 2.8 standard deviations. The best fit for the tt¯H production cross section is σ(tt¯H)=790-210+230 fb, in agreement with the Standard Model prediction of 507-50+35 fb. The combination of this result with other tt¯H searches from the ATLAS experiment using the Higgs boson decay modes to bb¯, γγ and ZZ*→4ℓ, has an observed significance of 4.2 standard deviations, compared to an expectation of 3.8 standard deviations. This provides evidence for the tt¯H production mode. |
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spelling |
Evidence for the associated production of the Higgs boson and a top quark pair with the ATLAS detectorA search for the associated production of the Higgs boson with a top quark pair (tt¯H) is reported. The search is performed in multilepton final states using a data set corresponding to an integrated luminosity of 36.1 fb-1 of proton-proton collision data recorded by the ATLAS experiment at a center-of-mass energy s=13 TeV at the Large Hadron Collider. Higgs boson decays to WW*, ττ, and ZZ* are targeted. Seven final states, categorized by the number and flavor of charged-lepton candidates, are examined for the presence of the Standard Model Higgs boson with a mass of 125 GeV and a pair of top quarks. An excess of events over the expected background from Standard Model processes is found with an observed significance of 4.1 standard deviations, compared to an expectation of 2.8 standard deviations. The best fit for the tt¯H production cross section is σ(tt¯H)=790-210+230 fb, in agreement with the Standard Model prediction of 507-50+35 fb. The combination of this result with other tt¯H searches from the ATLAS experiment using the Higgs boson decay modes to bb¯, γγ and ZZ*→4ℓ, has an observed significance of 4.2 standard deviations, compared to an expectation of 3.8 standard deviations. This provides evidence for the tt¯H production mode.AMVA4NewPhysicsRepositório ComumATLAS collaboration (2856 authors)Aguilar-Saavedra, Juan AntonioAmor Dos Santos, Susana PatriciaAraque, Juan PedroCastro, Nuno FilipeConde Muiño, PatriciaDa Cunha Sargedas De Sousa, Mario JoseFiolhais, MiguelGalhardo, BrunoGomes, AgostinhoGonçalo, RicardoJorge, PedroMachado Miguens, JoanaMaio, AméliaManeira, JoséOleiro Seabra, Luis FilipeOnofre, AntónioPedro, RuteSantos, HelenaSaraiva, JoãoSilva, JoséTavares Delgado, AdemarVeloso, FilipeWolters, Helmut2019-02-05T15:45:00Z2018-04-092019-02-05T15:45:00Z2018-04-09T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.26/27543enghttp://dx.doi.org/10.1103/PhysRevD.97.072003info: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:RCAAP2023-08-03T06:25:51Zoai:comum.rcaap.pt:10400.26/27543Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T15:54:18.636522Repositório 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 the Higgs boson and a top quark pair with the ATLAS detector |
title |
Evidence for the associated production of the Higgs boson and a top quark pair with the ATLAS detector |
spellingShingle |
Evidence for the associated production of the Higgs boson and a top quark pair with the ATLAS detector ATLAS collaboration (2856 authors) |
title_short |
Evidence for the associated production of the Higgs boson and a top quark pair with the ATLAS detector |
title_full |
Evidence for the associated production of the Higgs boson and a top quark pair with the ATLAS detector |
title_fullStr |
Evidence for the associated production of the Higgs boson and a top quark pair with the ATLAS detector |
title_full_unstemmed |
Evidence for the associated production of the Higgs boson and a top quark pair with the ATLAS detector |
title_sort |
Evidence for the associated production of the Higgs boson and a top quark pair with the ATLAS detector |
author |
ATLAS collaboration (2856 authors) |
author_facet |
ATLAS collaboration (2856 authors) Aguilar-Saavedra, Juan Antonio Amor Dos Santos, Susana Patricia Araque, Juan Pedro Castro, Nuno Filipe Conde Muiño, Patricia Da Cunha Sargedas De Sousa, Mario Jose Fiolhais, Miguel Galhardo, Bruno Gomes, Agostinho Gonçalo, Ricardo Jorge, Pedro Machado Miguens, Joana Maio, Amélia Maneira, José Oleiro Seabra, Luis Filipe Onofre, António Pedro, Rute Santos, Helena Saraiva, João Silva, José Tavares Delgado, Ademar Veloso, Filipe Wolters, Helmut |
author_role |
author |
author2 |
Aguilar-Saavedra, Juan Antonio Amor Dos Santos, Susana Patricia Araque, Juan Pedro Castro, Nuno Filipe Conde Muiño, Patricia Da Cunha Sargedas De Sousa, Mario Jose Fiolhais, Miguel Galhardo, Bruno Gomes, Agostinho Gonçalo, Ricardo Jorge, Pedro Machado Miguens, Joana Maio, Amélia Maneira, José Oleiro Seabra, Luis Filipe Onofre, António Pedro, Rute Santos, Helena Saraiva, João Silva, José Tavares Delgado, Ademar Veloso, Filipe Wolters, Helmut |
author2_role |
author author author author author author author author author author author author author author author author author author author author author author author |
dc.contributor.none.fl_str_mv |
Repositório Comum |
dc.contributor.author.fl_str_mv |
ATLAS collaboration (2856 authors) Aguilar-Saavedra, Juan Antonio Amor Dos Santos, Susana Patricia Araque, Juan Pedro Castro, Nuno Filipe Conde Muiño, Patricia Da Cunha Sargedas De Sousa, Mario Jose Fiolhais, Miguel Galhardo, Bruno Gomes, Agostinho Gonçalo, Ricardo Jorge, Pedro Machado Miguens, Joana Maio, Amélia Maneira, José Oleiro Seabra, Luis Filipe Onofre, António Pedro, Rute Santos, Helena Saraiva, João Silva, José Tavares Delgado, Ademar Veloso, Filipe Wolters, Helmut |
description |
A search for the associated production of the Higgs boson with a top quark pair (tt¯H) is reported. The search is performed in multilepton final states using a data set corresponding to an integrated luminosity of 36.1 fb-1 of proton-proton collision data recorded by the ATLAS experiment at a center-of-mass energy s=13 TeV at the Large Hadron Collider. Higgs boson decays to WW*, ττ, and ZZ* are targeted. Seven final states, categorized by the number and flavor of charged-lepton candidates, are examined for the presence of the Standard Model Higgs boson with a mass of 125 GeV and a pair of top quarks. An excess of events over the expected background from Standard Model processes is found with an observed significance of 4.1 standard deviations, compared to an expectation of 2.8 standard deviations. The best fit for the tt¯H production cross section is σ(tt¯H)=790-210+230 fb, in agreement with the Standard Model prediction of 507-50+35 fb. The combination of this result with other tt¯H searches from the ATLAS experiment using the Higgs boson decay modes to bb¯, γγ and ZZ*→4ℓ, has an observed significance of 4.2 standard deviations, compared to an expectation of 3.8 standard deviations. This provides evidence for the tt¯H production mode. |
publishDate |
2018 |
dc.date.none.fl_str_mv |
2018-04-09 2018-04-09T00:00:00Z 2019-02-05T15:45:00Z 2019-02-05T15:45:00Z |
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/10400.26/27543 |
url |
http://hdl.handle.net/10400.26/27543 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
http://dx.doi.org/10.1103/PhysRevD.97.072003 |
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.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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