Publicação
A search for top-squark pair production, in final states containing a top quark, a charm quark and missing transverse momentum, using the 139 fb-1 of pp collision data collected by the ATLAS detector
| Resumo: | This paper presents a search for top-squark pair production in final states with a top quark, a charm quark and missing transverse momentum. The data were collected with the ATLAS detector during LHC Run 2 and correspond to an integrated luminosity of \( 139 \, \text{fb}^{-1} \) of proton-proton collisions at a centre-of-mass energy of \( \sqrt{s} = 13 \, \text{TeV} \). The analysis is motivated by an extended Minimal Supersymmetric Standard Model featuring a non-minimal flavour violation in the second- and third-generation squark sector. The top squark in this model has two possible decay modes, either \( \tilde{t}_1 \rightarrow c\tilde{\chi}^0_1 \) or \( \tilde{t}_1 \rightarrow t\tilde{\chi}^0_1 \), where the \( \tilde{\chi}^0_1 \) is undetected. The analysis is optimised assuming that both of the decay modes are equally probable, leading to the most likely final state of \( tc + E_{\text{miss}}^T \). Good agreement is found between the Standard Model expectation and the data in the search regions. Exclusion limits at 95% CL are obtained in the \( m(\tilde{t}_1) \) vs. \( m(\tilde{\chi}^0_1) \) plane and, in addition, limits on the branching ratio of the \( \tilde{t}_1 \rightarrow t\tilde{\chi}^0_1 \) decay as a function of \( m(\tilde{t}_1) \) are also produced. Top-squark masses of up to 800 GeV are excluded for scenarios with light neutralinos, and top-squark masses up to 600 GeV are excluded in scenarios where the neutralino and the top squark are almost mass degenerate. |
|---|---|
| Autores principais: | Castro, Nuno Filipe |
| Outros Autores: | Onofre, A.; ATLAS Collaboration |
| Assunto: | Beyond Standard Model Hadron-Hadron Scattering Supersymmetry |
| Ano: | 2024 |
| País: | Portugal |
| Tipo de documento: | artigo |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | Universidade do Minho |
| Idioma: | inglês |
| Origem: | RepositóriUM - Universidade do Minho |
| _version_ | 1866271304905129984 |
|---|---|
| author | Castro, Nuno Filipe |
| author2 | Onofre, A. ATLAS Collaboration |
| author2_role | author author |
| author_facet | Castro, Nuno Filipe Onofre, A. ATLAS Collaboration |
| author_role | author |
| contributor_name_str_mv | Universidade do Minho |
| country_str | PT |
| creators_json_txt | [{\"Person.name\":\"Castro, Nuno Filipe\"},{\"Person.name\":\"Onofre, A.\"},{\"Person.name\":\"ATLAS Collaboration\"}] |
| datacite.contributors.contributor.contributorName.fl_str_mv | Universidade do Minho |
| datacite.creators.creator.creatorName.fl_str_mv | Castro, Nuno Filipe Onofre, A. ATLAS Collaboration |
| datacite.date.Accepted.fl_str_mv | 2024-01-01T00:00:00Z |
| datacite.rights.fl_str_mv | http://purl.org/coar/access_right/c_abf2 |
| datacite.subjects.subject.fl_str_mv | Beyond Standard Model Hadron-Hadron Scattering Supersymmetry |
| datacite.titles.title.fl_str_mv | A search for top-squark pair production, in final states containing a top quark, a charm quark and missing transverse momentum, using the 139 fb-1 of pp collision data collected by the ATLAS detector |
| dc.contributor.none.fl_str_mv | Universidade do Minho |
| dc.creator.none.fl_str_mv | Castro, Nuno Filipe Onofre, A. ATLAS Collaboration |
| dc.date.Accepted.fl_str_mv | 2024-01-01T00:00:00Z |
| dc.format.none.fl_str_mv | application/pdf |
| dc.identifier.none.fl_str_mv | https://hdl.handle.net/1822/98866 |
| dc.language.none.fl_str_mv | eng |
| dc.publisher.none.fl_str_mv | Springer |
| dc.rights.cclincense.fl_str_mv | http://creativecommons.org/licenses/by/4.0/ |
| dc.rights.none.fl_str_mv | http://purl.org/coar/access_right/c_abf2 |
| dc.rights.rights.copyright.fl_str_mv | openAccess |
| dc.subject.none.fl_str_mv | Beyond Standard Model Hadron-Hadron Scattering Supersymmetry |
| dc.title.fl_str_mv | A search for top-squark pair production, in final states containing a top quark, a charm quark and missing transverse momentum, using the 139 fb-1 of pp collision data collected by the ATLAS detector |
| dc.type.none.fl_str_mv | http://purl.org/coar/resource_type/c_6501 |
| description | This paper presents a search for top-squark pair production in final states with a top quark, a charm quark and missing transverse momentum. The data were collected with the ATLAS detector during LHC Run 2 and correspond to an integrated luminosity of \( 139 \, \text{fb}^{-1} \) of proton-proton collisions at a centre-of-mass energy of \( \sqrt{s} = 13 \, \text{TeV} \). The analysis is motivated by an extended Minimal Supersymmetric Standard Model featuring a non-minimal flavour violation in the second- and third-generation squark sector. The top squark in this model has two possible decay modes, either \( \tilde{t}_1 \rightarrow c\tilde{\chi}^0_1 \) or \( \tilde{t}_1 \rightarrow t\tilde{\chi}^0_1 \), where the \( \tilde{\chi}^0_1 \) is undetected. The analysis is optimised assuming that both of the decay modes are equally probable, leading to the most likely final state of \( tc + E_{\text{miss}}^T \). Good agreement is found between the Standard Model expectation and the data in the search regions. Exclusion limits at 95% CL are obtained in the \( m(\tilde{t}_1) \) vs. \( m(\tilde{\chi}^0_1) \) plane and, in addition, limits on the branching ratio of the \( \tilde{t}_1 \rightarrow t\tilde{\chi}^0_1 \) decay as a function of \( m(\tilde{t}_1) \) are also produced. Top-squark masses of up to 800 GeV are excluded for scenarios with light neutralinos, and top-squark masses up to 600 GeV are excluded in scenarios where the neutralino and the top squark are almost mass degenerate. |
| dirty | 0 |
| eu_rights_str_mv | openAccess |
| format | article |
| fulltext.url.fl_str_mv | https://repositorium.uminho.pt/bitstreams/9f99f902-25d6-4e26-9909-6b9e2f2b3a81/download |
| id | rum_68de76ec2fba5000fe26562fbb68c741 |
| identifier.url.fl_str_mv | https://hdl.handle.net/1822/98866 |
| instacron_str | repositorium |
| institution | Universidade do Minho |
| instname_str | Universidade do Minho |
| language | eng |
| network_acronym_str | rum |
| network_name_str | RepositóriUM - Universidade do Minho |
| oai_identifier_str | oai:repositorium.uminho.pt:1822/98866 |
| organization_str_mv | urn:organizationAcronym:repositorium |
| person_str_mv | Castro, Nuno Filipe Onofre, A. ATLAS Collaboration |
| publishDate | 2024 |
| publisher.none.fl_str_mv | Springer |
| reponame_str | RepositóriUM - Universidade do Minho |
| repository_id_str | urn:repositoryAcronym:rum |
| service_str_mv | urn:repositoryAcronym:rum |
| spelling | engSpringerengThis paper presents a search for top-squark pair production in final states with a top quark, a charm quark and missing transverse momentum. The data were collected with the ATLAS detector during LHC Run 2 and correspond to an integrated luminosity of \( 139 \, \text{fb}^{-1} \) of proton-proton collisions at a centre-of-mass energy of \( \sqrt{s} = 13 \, \text{TeV} \). The analysis is motivated by an extended Minimal Supersymmetric Standard Model featuring a non-minimal flavour violation in the second- and third-generation squark sector. The top squark in this model has two possible decay modes, either \( \tilde{t}_1 \rightarrow c\tilde{\chi}^0_1 \) or \( \tilde{t}_1 \rightarrow t\tilde{\chi}^0_1 \), where the \( \tilde{\chi}^0_1 \) is undetected. The analysis is optimised assuming that both of the decay modes are equally probable, leading to the most likely final state of \( tc + E_{\text{miss}}^T \). Good agreement is found between the Standard Model expectation and the data in the search regions. Exclusion limits at 95% CL are obtained in the \( m(\tilde{t}_1) \) vs. \( m(\tilde{\chi}^0_1) \) plane and, in addition, limits on the branching ratio of the \( \tilde{t}_1 \rightarrow t\tilde{\chi}^0_1 \) decay as a function of \( m(\tilde{t}_1) \) are also produced. Top-squark masses of up to 800 GeV are excluded for scenarios with light neutralinos, and top-squark masses up to 600 GeV are excluded in scenarios where the neutralino and the top squark are almost mass degenerate.application/pdfengA search for top-squark pair production, in final states containing a top quark, a charm quark and missing transverse momentum, using the 139 fb-1 of pp collision data collected by the ATLAS detectorCastro, Nuno FilipeOnofre, A.ATLAS CollaborationHostingInstitutionOrganizationalUniversidade do Minhoe-mailmailto:repositorium@usdb.uminho.ptrepositorium@usdb.uminho.ptISSNIsPartOf1126-6708DOIIsPartOf10.1007/jhep07(2024)25020242024-01-01T00:00:00ZHandlehttps://hdl.handle.net/1822/98866http://purl.org/coar/access_right/c_abf2open accessBeyond Standard ModelHadron-Hadron ScatteringSupersymmetry1614413 bytesliteraturehttp://purl.org/coar/resource_type/c_6501journal article2024http://creativecommons.org/licenses/by/4.0/openAccesshttp://purl.org/coar/access_right/c_abf2application/pdffulltexthttps://repositorium.uminho.pt/bitstreams/9f99f902-25d6-4e26-9909-6b9e2f2b3a81/download |
| spellingShingle | A search for top-squark pair production, in final states containing a top quark, a charm quark and missing transverse momentum, using the 139 fb-1 of pp collision data collected by the ATLAS detector Castro, Nuno Filipe Beyond Standard Model Hadron-Hadron Scattering Supersymmetry |
| status | SINGLETON |
| subject.fl_str_mv | Beyond Standard Model Hadron-Hadron Scattering Supersymmetry |
| title | A search for top-squark pair production, in final states containing a top quark, a charm quark and missing transverse momentum, using the 139 fb-1 of pp collision data collected by the ATLAS detector |
| title_full | A search for top-squark pair production, in final states containing a top quark, a charm quark and missing transverse momentum, using the 139 fb-1 of pp collision data collected by the ATLAS detector |
| title_fullStr | A search for top-squark pair production, in final states containing a top quark, a charm quark and missing transverse momentum, using the 139 fb-1 of pp collision data collected by the ATLAS detector |
| title_full_unstemmed | A search for top-squark pair production, in final states containing a top quark, a charm quark and missing transverse momentum, using the 139 fb-1 of pp collision data collected by the ATLAS detector |
| title_short | A search for top-squark pair production, in final states containing a top quark, a charm quark and missing transverse momentum, using the 139 fb-1 of pp collision data collected by the ATLAS detector |
| title_sort | A search for top-squark pair production, in final states containing a top quark, a charm quark and missing transverse momentum, using the 139 fb-1 of pp collision data collected by the ATLAS detector |
| topic | Beyond Standard Model Hadron-Hadron Scattering Supersymmetry |
| topic_facet | Beyond Standard Model Hadron-Hadron Scattering Supersymmetry |
| url | https://hdl.handle.net/1822/98866 |
| visible | 1 |