Scalar mass dependence of angular variables in $t\bar tφ$ production
Autor(a) principal: | |
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Data de Publicação: | 2020 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | https://hdl.handle.net/1822/69371 |
Resumo: | In this paper we explore CP discrimination in the associated production of top-quark pairs ($t\bar{t}$) with a generic scalar boson ($\phi$) at the LHC. We probe the CP-sensitivity of several observables for a varying scalar boson mass and CP-number, either CP-even ($\phi=H$) or CP-odd ($\phi=A$), using dileptonic final states of the $t\bar{t}\phi$ system, with $\phi\rightarrow b\bar{b}$. We show that CP-searches are virtually impossible for $\phi$ boson masses above a few hundred GeV in this channel. A full phenomenological analysis was performed, using Standard Model background and signal events generated with MadGraph5 MC@NLO and reconstructed using a kinematic fit. The most sensitive CP-observables are used to compute Confidence Levels (CLs), as a function of luminosity, for the exclusion of different signal hypotheses with scalar and pseudoscalar boson masses that range from $m_\phi$ = 40 GeV up to 200 GeV. We finalize by analysing the impact of a measurement (or limit) of the CP-violating angle in the parameter space of a complex two-Higgs doublet model known as the C2HDM. |
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Scalar mass dependence of angular variables in $t\bar tφ$ productionBeyond Standard ModelCP violationCiências Naturais::Ciências FísicasScience & TechnologyIn this paper we explore CP discrimination in the associated production of top-quark pairs ($t\bar{t}$) with a generic scalar boson ($\phi$) at the LHC. We probe the CP-sensitivity of several observables for a varying scalar boson mass and CP-number, either CP-even ($\phi=H$) or CP-odd ($\phi=A$), using dileptonic final states of the $t\bar{t}\phi$ system, with $\phi\rightarrow b\bar{b}$. We show that CP-searches are virtually impossible for $\phi$ boson masses above a few hundred GeV in this channel. A full phenomenological analysis was performed, using Standard Model background and signal events generated with MadGraph5 MC@NLO and reconstructed using a kinematic fit. The most sensitive CP-observables are used to compute Confidence Levels (CLs), as a function of luminosity, for the exclusion of different signal hypotheses with scalar and pseudoscalar boson masses that range from $m_\phi$ = 40 GeV up to 200 GeV. We finalize by analysing the impact of a measurement (or limit) of the CP-violating angle in the parameter space of a complex two-Higgs doublet model known as the C2HDM.DA, RC and RS are partially supported by the Portuguese Foundation for Science and Tech-nology (FCT) under Contracts no. UIDB/00618/2020, UIDP/00618/2020, PTDC/FIS-PAR/31000 /2017 and CERN/FIS-PAR/0002/2017, and the HARMONIA project undercontract UMO-2015/18/M/ ST2/00518. AO is partially supported by FCT, under the Contract CERN/FIS-PAR/0029/2019. DA is supported by ULisboa { BD2018.info:eu-repo/semantics/publishedVersionSpringerUniversidade do MinhoAzevedo, DuarteCapucha, RodrigoOnofre, A.Santos, Rui20202020-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/1822/69371engAzevedo, D., Capucha, R., Onofre, A., & Santos, R. (2020). Scalar mass dependence of angular variables in tt¯ ϕ production. [Article]. Journal of High Energy Physics, 2020(6). doi: 10.1007/jhep06(2020)1551126-67081029-847910.1007/JHEP06(2020)155https://link.springer.com/article/10.1007%2FJHEP06%282020%29155info: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:RCAAP2023-07-21T12:37:06Zoai:repositorium.sdum.uminho.pt:1822/69371Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T19:33:21.396512Repositório 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 |
Scalar mass dependence of angular variables in $t\bar tφ$ production |
title |
Scalar mass dependence of angular variables in $t\bar tφ$ production |
spellingShingle |
Scalar mass dependence of angular variables in $t\bar tφ$ production Azevedo, Duarte Beyond Standard Model CP violation Ciências Naturais::Ciências Físicas Science & Technology |
title_short |
Scalar mass dependence of angular variables in $t\bar tφ$ production |
title_full |
Scalar mass dependence of angular variables in $t\bar tφ$ production |
title_fullStr |
Scalar mass dependence of angular variables in $t\bar tφ$ production |
title_full_unstemmed |
Scalar mass dependence of angular variables in $t\bar tφ$ production |
title_sort |
Scalar mass dependence of angular variables in $t\bar tφ$ production |
author |
Azevedo, Duarte |
author_facet |
Azevedo, Duarte Capucha, Rodrigo Onofre, A. Santos, Rui |
author_role |
author |
author2 |
Capucha, Rodrigo Onofre, A. Santos, Rui |
author2_role |
author author author |
dc.contributor.none.fl_str_mv |
Universidade do Minho |
dc.contributor.author.fl_str_mv |
Azevedo, Duarte Capucha, Rodrigo Onofre, A. Santos, Rui |
dc.subject.por.fl_str_mv |
Beyond Standard Model CP violation Ciências Naturais::Ciências Físicas Science & Technology |
topic |
Beyond Standard Model CP violation Ciências Naturais::Ciências Físicas Science & Technology |
description |
In this paper we explore CP discrimination in the associated production of top-quark pairs ($t\bar{t}$) with a generic scalar boson ($\phi$) at the LHC. We probe the CP-sensitivity of several observables for a varying scalar boson mass and CP-number, either CP-even ($\phi=H$) or CP-odd ($\phi=A$), using dileptonic final states of the $t\bar{t}\phi$ system, with $\phi\rightarrow b\bar{b}$. We show that CP-searches are virtually impossible for $\phi$ boson masses above a few hundred GeV in this channel. A full phenomenological analysis was performed, using Standard Model background and signal events generated with MadGraph5 MC@NLO and reconstructed using a kinematic fit. The most sensitive CP-observables are used to compute Confidence Levels (CLs), as a function of luminosity, for the exclusion of different signal hypotheses with scalar and pseudoscalar boson masses that range from $m_\phi$ = 40 GeV up to 200 GeV. We finalize by analysing the impact of a measurement (or limit) of the CP-violating angle in the parameter space of a complex two-Higgs doublet model known as the C2HDM. |
publishDate |
2020 |
dc.date.none.fl_str_mv |
2020 2020-01-01T00:00:00Z |
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 |
https://hdl.handle.net/1822/69371 |
url |
https://hdl.handle.net/1822/69371 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Azevedo, D., Capucha, R., Onofre, A., & Santos, R. (2020). Scalar mass dependence of angular variables in tt¯ ϕ production. [Article]. Journal of High Energy Physics, 2020(6). doi: 10.1007/jhep06(2020)155 1126-6708 1029-8479 10.1007/JHEP06(2020)155 https://link.springer.com/article/10.1007%2FJHEP06%282020%29155 |
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 |
Springer |
publisher.none.fl_str_mv |
Springer |
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 |
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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1799132850439585792 |