Search for charged Higgs bosons through the violation of lepton universality in $t\bar{t}$ events using $pp$ collision data at $\sqrt{s}=7$ TeV with the ATLAS experiment
Autor(a) principal: | |
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Data de Publicação: | 2013 |
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/10400.26/26346 |
Resumo: | In several extensions of the Standard Model, the top quark can decay into a bottom quark and a light charged Higgs boson $H^+, t \to bH^+$, in addition to the Standard Model decay $t \to bW$. Since W bosons decay to the three lepton generations equally, while $H^+$ may predominantly decay into $\tau\nu$, charged Higgs bosons can be searched for using the violation of lepton universality in top quark decays. The analysis in this paper is based on 4.6/fb of proton-proton collision data at $\sqrt{s}$ = 7 TeV collected by the ATLAS experiment at the Large Hadron Collider. Signatures containing leptons (e or $\mu$) and/or a hadronically decaying $\tau (\tau_{had})$ are used. Event yield ratios between $e+\tau_{had}$ and $e+\mu$, as well as between $\mu+\tau_{had}$ and $\mu+e$, final states are measured in the data and compared to predictions from simulations. This ratio-based method reduces the impact of systematic uncertainties in the analysis. No significant deviation from the Standard Model predictions is observed. With the assumption that the branching fraction $B(H^+ \to \tau\nu)$ is 100%, upper limits in the range 3.2%-4.4% can be placed on the branching fraction $B(t \to bH^+)$ for charged Higgs boson masses $m_{H+}$ in the range 90-140 GeV. After combination with results from a search for charged Higgs bosons in ttbar decays using the $\tau_{had}$+jets final state, upper limits on $B(t \to bH^+)$ can be set in the range 0.8%-3.4%, for $m_{H+}$ in the range 90-160 GeV. |
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7160 |
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Search for charged Higgs bosons through the violation of lepton universality in $t\bar{t}$ events using $pp$ collision data at $\sqrt{s}=7$ TeV with the ATLAS experimentIn several extensions of the Standard Model, the top quark can decay into a bottom quark and a light charged Higgs boson $H^+, t \to bH^+$, in addition to the Standard Model decay $t \to bW$. Since W bosons decay to the three lepton generations equally, while $H^+$ may predominantly decay into $\tau\nu$, charged Higgs bosons can be searched for using the violation of lepton universality in top quark decays. The analysis in this paper is based on 4.6/fb of proton-proton collision data at $\sqrt{s}$ = 7 TeV collected by the ATLAS experiment at the Large Hadron Collider. Signatures containing leptons (e or $\mu$) and/or a hadronically decaying $\tau (\tau_{had})$ are used. Event yield ratios between $e+\tau_{had}$ and $e+\mu$, as well as between $\mu+\tau_{had}$ and $\mu+e$, final states are measured in the data and compared to predictions from simulations. This ratio-based method reduces the impact of systematic uncertainties in the analysis. No significant deviation from the Standard Model predictions is observed. With the assumption that the branching fraction $B(H^+ \to \tau\nu)$ is 100%, upper limits in the range 3.2%-4.4% can be placed on the branching fraction $B(t \to bH^+)$ for charged Higgs boson masses $m_{H+}$ in the range 90-140 GeV. After combination with results from a search for charged Higgs bosons in ttbar decays using the $\tau_{had}$+jets final state, upper limits on $B(t \to bH^+)$ can be set in the range 0.8%-3.4%, for $m_{H+}$ in the range 90-160 GeV.Repositório ComumATLAS collaboration (2900 authors)Aguilar-Saavedra, Juan AntonioAmor Dos Santos, Susana PatriciaAnjos, NunoCantrill, RobertCarvalho, JoãoCastro, Nuno FilipeConde Muiño, PatriciaDa Cunha Sargedas De Sousa, Mario JoseDo Valle Wemans, AndréFiolhais, MiguelGalhardo, BrunoGomes, AgostinhoGonçalo, RicardoJorge, PedroLopes, LourencoMachado Miguens, JoanaMaio, AméliaManeira, JoséOliveira, Miguel AlfonsoOnofre, AntónioPalma, AlbertoPina, João AntonioPinto, BelmiroSantos, HelenaSaraiva, JoãoSilva, JoséVeloso, FilipeWolters, Helmut2019-02-03T22:03:50Z20132019-02-03T22:03:50Z2013-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.26/26346enghttp://dx.doi.org/10.1007/JHEP03(2013)076info: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:RCAAP2023-08-03T06:25:43Zoai:comum.rcaap.pt:10400.26/26346Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T15:53:32.404799Repositório 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 charged Higgs bosons through the violation of lepton universality in $t\bar{t}$ events using $pp$ collision data at $\sqrt{s}=7$ TeV with the ATLAS experiment |
title |
Search for charged Higgs bosons through the violation of lepton universality in $t\bar{t}$ events using $pp$ collision data at $\sqrt{s}=7$ TeV with the ATLAS experiment |
spellingShingle |
Search for charged Higgs bosons through the violation of lepton universality in $t\bar{t}$ events using $pp$ collision data at $\sqrt{s}=7$ TeV with the ATLAS experiment ATLAS collaboration (2900 authors) |
title_short |
Search for charged Higgs bosons through the violation of lepton universality in $t\bar{t}$ events using $pp$ collision data at $\sqrt{s}=7$ TeV with the ATLAS experiment |
title_full |
Search for charged Higgs bosons through the violation of lepton universality in $t\bar{t}$ events using $pp$ collision data at $\sqrt{s}=7$ TeV with the ATLAS experiment |
title_fullStr |
Search for charged Higgs bosons through the violation of lepton universality in $t\bar{t}$ events using $pp$ collision data at $\sqrt{s}=7$ TeV with the ATLAS experiment |
title_full_unstemmed |
Search for charged Higgs bosons through the violation of lepton universality in $t\bar{t}$ events using $pp$ collision data at $\sqrt{s}=7$ TeV with the ATLAS experiment |
title_sort |
Search for charged Higgs bosons through the violation of lepton universality in $t\bar{t}$ events using $pp$ collision data at $\sqrt{s}=7$ TeV with the ATLAS experiment |
author |
ATLAS collaboration (2900 authors) |
author_facet |
ATLAS collaboration (2900 authors) Aguilar-Saavedra, Juan Antonio Amor Dos Santos, Susana Patricia Anjos, Nuno Cantrill, Robert Carvalho, João Castro, Nuno Filipe Conde Muiño, Patricia Da Cunha Sargedas De Sousa, Mario Jose Do Valle Wemans, André Fiolhais, Miguel Galhardo, Bruno Gomes, Agostinho Gonçalo, Ricardo Jorge, Pedro Lopes, Lourenco Machado Miguens, Joana Maio, Amélia Maneira, José Oliveira, Miguel Alfonso Onofre, António Palma, Alberto Pina, João Antonio Pinto, Belmiro Santos, Helena Saraiva, João Silva, José Veloso, Filipe Wolters, Helmut |
author_role |
author |
author2 |
Aguilar-Saavedra, Juan Antonio Amor Dos Santos, Susana Patricia Anjos, Nuno Cantrill, Robert Carvalho, João Castro, Nuno Filipe Conde Muiño, Patricia Da Cunha Sargedas De Sousa, Mario Jose Do Valle Wemans, André Fiolhais, Miguel Galhardo, Bruno Gomes, Agostinho Gonçalo, Ricardo Jorge, Pedro Lopes, Lourenco Machado Miguens, Joana Maio, Amélia Maneira, José Oliveira, Miguel Alfonso Onofre, António Palma, Alberto Pina, João Antonio Pinto, Belmiro Santos, Helena Saraiva, João Silva, José 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 author author |
dc.contributor.none.fl_str_mv |
Repositório Comum |
dc.contributor.author.fl_str_mv |
ATLAS collaboration (2900 authors) Aguilar-Saavedra, Juan Antonio Amor Dos Santos, Susana Patricia Anjos, Nuno Cantrill, Robert Carvalho, João Castro, Nuno Filipe Conde Muiño, Patricia Da Cunha Sargedas De Sousa, Mario Jose Do Valle Wemans, André Fiolhais, Miguel Galhardo, Bruno Gomes, Agostinho Gonçalo, Ricardo Jorge, Pedro Lopes, Lourenco Machado Miguens, Joana Maio, Amélia Maneira, José Oliveira, Miguel Alfonso Onofre, António Palma, Alberto Pina, João Antonio Pinto, Belmiro Santos, Helena Saraiva, João Silva, José Veloso, Filipe Wolters, Helmut |
description |
In several extensions of the Standard Model, the top quark can decay into a bottom quark and a light charged Higgs boson $H^+, t \to bH^+$, in addition to the Standard Model decay $t \to bW$. Since W bosons decay to the three lepton generations equally, while $H^+$ may predominantly decay into $\tau\nu$, charged Higgs bosons can be searched for using the violation of lepton universality in top quark decays. The analysis in this paper is based on 4.6/fb of proton-proton collision data at $\sqrt{s}$ = 7 TeV collected by the ATLAS experiment at the Large Hadron Collider. Signatures containing leptons (e or $\mu$) and/or a hadronically decaying $\tau (\tau_{had})$ are used. Event yield ratios between $e+\tau_{had}$ and $e+\mu$, as well as between $\mu+\tau_{had}$ and $\mu+e$, final states are measured in the data and compared to predictions from simulations. This ratio-based method reduces the impact of systematic uncertainties in the analysis. No significant deviation from the Standard Model predictions is observed. With the assumption that the branching fraction $B(H^+ \to \tau\nu)$ is 100%, upper limits in the range 3.2%-4.4% can be placed on the branching fraction $B(t \to bH^+)$ for charged Higgs boson masses $m_{H+}$ in the range 90-140 GeV. After combination with results from a search for charged Higgs bosons in ttbar decays using the $\tau_{had}$+jets final state, upper limits on $B(t \to bH^+)$ can be set in the range 0.8%-3.4%, for $m_{H+}$ in the range 90-160 GeV. |
publishDate |
2013 |
dc.date.none.fl_str_mv |
2013 2013-01-01T00:00:00Z 2019-02-03T22:03:50Z 2019-02-03T22:03:50Z |
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/10400.26/26346 |
url |
http://hdl.handle.net/10400.26/26346 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
http://dx.doi.org/10.1007/JHEP03(2013)076 |
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 |
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instname_str |
Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
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 |
repository.mail.fl_str_mv |
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