Search for flavor-changing neutral currents in top quark decays $t\to Hc$ and $t \to Hu$ in multilepton final states in proton-proton collisions at $\sqrt{s}= 13$ TeV with the ATLAS detector

Detalhes bibliográficos
Autor(a) principal: ATLAS collaboration (2918 authors)
Data de Publicação: 2018
Outros Autores: Aguilar Saavedra, Juan Antonio, Amor Dos Santos, Susana Patricia, Araque Espinosa, Juan Pedro, Castro, Nuno Filipe, Conde Muino, Patricia, Da Cunha Sargedas De Sousa, Mario Jose, Dias DO Vale, Tiago, Faisca Rodrigues Pereira, Rui Miguel, Fiolhais, Miguel, Galhardo, Bruno, Gomes, Agostinho, Goncalo, Ricardo, Jorge, Pedro, Machado Miguens, Joana, Maio, Amelia, Maneira, Jose, Mendes Gouveia, Emanuel Demetrio, Oleiro Seabra, Luis Filipe, Onofre, Antonio, Costa Batalha Pedro, Rute, Pereira Peixoto, Ana Paula, Santos, Helena, Saraiva, Joao, Silva, Jose Manuel, Tavares Delgado, Ademar, Veloso, Filipe, Wolters, Helmut
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10400.26/27632
Resumo: Flavor-changing neutral currents are not present in the Standard Model at tree level and are suppressed in loop processes by the unitarity of the Cabibbo-Kobayashi-Maskawa matrix; the corresponding rates for top quark decay processes are experimentally unobservable. Extensions of the Standard Model can generate new flavor-changing neutral current processes, leading to signals which, if observed, would be unambiguous evidence of new interactions. A data set corresponding to an integrated luminosity of 36.1  fb-1 of pp collisions at a center-of-mass energy of s=13  TeV recorded with the ATLAS detector at the Large Hadron Collider is used to search for top quarks decaying to up or charm quarks with the emission of a Higgs boson, with subsequent Higgs boson decay to final states with at least one electron or muon. No signal is observed and limits on the branching fractions B(t→Hc)<0.16% and B(t→Hu)<0.19% at 95% confidence level are obtained (with expected limits of 0.15% in both cases).
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spelling Search for flavor-changing neutral currents in top quark decays $t\to Hc$ and $t \to Hu$ in multilepton final states in proton-proton collisions at $\sqrt{s}= 13$ TeV with the ATLAS detectorFlavor-changing neutral currents are not present in the Standard Model at tree level and are suppressed in loop processes by the unitarity of the Cabibbo-Kobayashi-Maskawa matrix; the corresponding rates for top quark decay processes are experimentally unobservable. Extensions of the Standard Model can generate new flavor-changing neutral current processes, leading to signals which, if observed, would be unambiguous evidence of new interactions. A data set corresponding to an integrated luminosity of 36.1  fb-1 of pp collisions at a center-of-mass energy of s=13  TeV recorded with the ATLAS detector at the Large Hadron Collider is used to search for top quarks decaying to up or charm quarks with the emission of a Higgs boson, with subsequent Higgs boson decay to final states with at least one electron or muon. No signal is observed and limits on the branching fractions B(t→Hc)<0.16% and B(t→Hu)<0.19% at 95% confidence level are obtained (with expected limits of 0.15% in both cases).Repositório ComumATLAS collaboration (2918 authors)Aguilar Saavedra, Juan AntonioAmor Dos Santos, Susana PatriciaAraque Espinosa, Juan PedroCastro, Nuno FilipeConde Muino, PatriciaDa Cunha Sargedas De Sousa, Mario JoseDias DO Vale, TiagoFaisca Rodrigues Pereira, Rui MiguelFiolhais, MiguelGalhardo, BrunoGomes, AgostinhoGoncalo, RicardoJorge, PedroMachado Miguens, JoanaMaio, AmeliaManeira, JoseMendes Gouveia, Emanuel DemetrioOleiro Seabra, Luis FilipeOnofre, AntonioCosta Batalha Pedro, RutePereira Peixoto, Ana PaulaSantos, HelenaSaraiva, JoaoSilva, Jose ManuelTavares Delgado, AdemarVeloso, FilipeWolters, Helmut2019-02-05T16:20:37Z2018-08-072019-02-05T16:20:37Z2018-08-07T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.26/27632enghttp://dx.doi.org/10.1103/PhysRevD.98.032002info: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:RCAAP2024-05-16T07:39:07Zoai:comum.rcaap.pt:10400.26/27632Portal AgregadorONGhttps://www.rcaap.pt/oai/openairemluisa.alvim@gmail.comopendoar:71602024-05-16T07:39:07Repositório 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 Search for flavor-changing neutral currents in top quark decays $t\to Hc$ and $t \to Hu$ in multilepton final states in proton-proton collisions at $\sqrt{s}= 13$ TeV with the ATLAS detector
title Search for flavor-changing neutral currents in top quark decays $t\to Hc$ and $t \to Hu$ in multilepton final states in proton-proton collisions at $\sqrt{s}= 13$ TeV with the ATLAS detector
spellingShingle Search for flavor-changing neutral currents in top quark decays $t\to Hc$ and $t \to Hu$ in multilepton final states in proton-proton collisions at $\sqrt{s}= 13$ TeV with the ATLAS detector
ATLAS collaboration (2918 authors)
title_short Search for flavor-changing neutral currents in top quark decays $t\to Hc$ and $t \to Hu$ in multilepton final states in proton-proton collisions at $\sqrt{s}= 13$ TeV with the ATLAS detector
title_full Search for flavor-changing neutral currents in top quark decays $t\to Hc$ and $t \to Hu$ in multilepton final states in proton-proton collisions at $\sqrt{s}= 13$ TeV with the ATLAS detector
title_fullStr Search for flavor-changing neutral currents in top quark decays $t\to Hc$ and $t \to Hu$ in multilepton final states in proton-proton collisions at $\sqrt{s}= 13$ TeV with the ATLAS detector
title_full_unstemmed Search for flavor-changing neutral currents in top quark decays $t\to Hc$ and $t \to Hu$ in multilepton final states in proton-proton collisions at $\sqrt{s}= 13$ TeV with the ATLAS detector
title_sort Search for flavor-changing neutral currents in top quark decays $t\to Hc$ and $t \to Hu$ in multilepton final states in proton-proton collisions at $\sqrt{s}= 13$ TeV with the ATLAS detector
author ATLAS collaboration (2918 authors)
author_facet ATLAS collaboration (2918 authors)
Aguilar Saavedra, Juan Antonio
Amor Dos Santos, Susana Patricia
Araque Espinosa, Juan Pedro
Castro, Nuno Filipe
Conde Muino, Patricia
Da Cunha Sargedas De Sousa, Mario Jose
Dias DO Vale, Tiago
Faisca Rodrigues Pereira, Rui Miguel
Fiolhais, Miguel
Galhardo, Bruno
Gomes, Agostinho
Goncalo, Ricardo
Jorge, Pedro
Machado Miguens, Joana
Maio, Amelia
Maneira, Jose
Mendes Gouveia, Emanuel Demetrio
Oleiro Seabra, Luis Filipe
Onofre, Antonio
Costa Batalha Pedro, Rute
Pereira Peixoto, Ana Paula
Santos, Helena
Saraiva, Joao
Silva, Jose Manuel
Tavares Delgado, Ademar
Veloso, Filipe
Wolters, Helmut
author_role author
author2 Aguilar Saavedra, Juan Antonio
Amor Dos Santos, Susana Patricia
Araque Espinosa, Juan Pedro
Castro, Nuno Filipe
Conde Muino, Patricia
Da Cunha Sargedas De Sousa, Mario Jose
Dias DO Vale, Tiago
Faisca Rodrigues Pereira, Rui Miguel
Fiolhais, Miguel
Galhardo, Bruno
Gomes, Agostinho
Goncalo, Ricardo
Jorge, Pedro
Machado Miguens, Joana
Maio, Amelia
Maneira, Jose
Mendes Gouveia, Emanuel Demetrio
Oleiro Seabra, Luis Filipe
Onofre, Antonio
Costa Batalha Pedro, Rute
Pereira Peixoto, Ana Paula
Santos, Helena
Saraiva, Joao
Silva, Jose Manuel
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
author
author
author
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dc.contributor.none.fl_str_mv Repositório Comum
dc.contributor.author.fl_str_mv ATLAS collaboration (2918 authors)
Aguilar Saavedra, Juan Antonio
Amor Dos Santos, Susana Patricia
Araque Espinosa, Juan Pedro
Castro, Nuno Filipe
Conde Muino, Patricia
Da Cunha Sargedas De Sousa, Mario Jose
Dias DO Vale, Tiago
Faisca Rodrigues Pereira, Rui Miguel
Fiolhais, Miguel
Galhardo, Bruno
Gomes, Agostinho
Goncalo, Ricardo
Jorge, Pedro
Machado Miguens, Joana
Maio, Amelia
Maneira, Jose
Mendes Gouveia, Emanuel Demetrio
Oleiro Seabra, Luis Filipe
Onofre, Antonio
Costa Batalha Pedro, Rute
Pereira Peixoto, Ana Paula
Santos, Helena
Saraiva, Joao
Silva, Jose Manuel
Tavares Delgado, Ademar
Veloso, Filipe
Wolters, Helmut
description Flavor-changing neutral currents are not present in the Standard Model at tree level and are suppressed in loop processes by the unitarity of the Cabibbo-Kobayashi-Maskawa matrix; the corresponding rates for top quark decay processes are experimentally unobservable. Extensions of the Standard Model can generate new flavor-changing neutral current processes, leading to signals which, if observed, would be unambiguous evidence of new interactions. A data set corresponding to an integrated luminosity of 36.1  fb-1 of pp collisions at a center-of-mass energy of s=13  TeV recorded with the ATLAS detector at the Large Hadron Collider is used to search for top quarks decaying to up or charm quarks with the emission of a Higgs boson, with subsequent Higgs boson decay to final states with at least one electron or muon. No signal is observed and limits on the branching fractions B(t→Hc)<0.16% and B(t→Hu)<0.19% at 95% confidence level are obtained (with expected limits of 0.15% in both cases).
publishDate 2018
dc.date.none.fl_str_mv 2018-08-07
2018-08-07T00:00:00Z
2019-02-05T16:20:37Z
2019-02-05T16:20:37Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
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url http://hdl.handle.net/10400.26/27632
dc.language.iso.fl_str_mv eng
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dc.relation.none.fl_str_mv http://dx.doi.org/10.1103/PhysRevD.98.032002
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