Search for Higgs boson decays to a Z boson and a photon in proton-proton collisions at √s = 13 TeV
Autor(a) principal: | |
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Data de Publicação: | 2023 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/270341 |
Resumo: | Results are presented from a search for the Higgs boson decay H → Zγ, where Z → ` + ` − with ` = e or µ. The search is performed using a sample of proton-proton (pp) collision data at a center-of-mass energy of 13 TeV, recorded by the CMS experiment at the LHC, corresponding to an integrated luminosity of 138 fb−1 . Events are assigned to mutually exclusive categories, which exploit differences in both event topology and kinematics of distinct Higgs production mechanisms to enhance signal sensitivity. The signal strength µ, defined as the product of the cross section and the branching fraction [σ(pp → H)B(H → Zγ)] relative to the standard model prediction, is extracted from a simultaneous fit to the ` + ` − γ invariant mass distributions in all categories and is measured to be µ = 2.4 ± 0.9 for a Higgs boson mass of 125.38 GeV. The statistical significance of the observed excess of events is 2.7 standard deviations. This measurement corresponds to σ(pp → H)B(H → Zγ) = 0.21 ± 0.08 pb. The observed (expected) upper limit at 95% confidence level on µ is 4.1 (1.8), where the expected limit is calculated under the background-only hypothesis. The ratio of branching fractions B(H → Zγ)/B(H → γγ) is measured to be 1.5 +0.7 −0.6 , which agrees with the standard model prediction of 0.69 ± 0.04 at the 1.5 standard deviation level. |
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Tumasyan, ArmenSilveira, Gustavo Gil daBernardes, César AugustoCMS Collaboration2023-12-19T03:24:28Z20231029-8479http://hdl.handle.net/10183/270341001186847Results are presented from a search for the Higgs boson decay H → Zγ, where Z → ` + ` − with ` = e or µ. The search is performed using a sample of proton-proton (pp) collision data at a center-of-mass energy of 13 TeV, recorded by the CMS experiment at the LHC, corresponding to an integrated luminosity of 138 fb−1 . Events are assigned to mutually exclusive categories, which exploit differences in both event topology and kinematics of distinct Higgs production mechanisms to enhance signal sensitivity. The signal strength µ, defined as the product of the cross section and the branching fraction [σ(pp → H)B(H → Zγ)] relative to the standard model prediction, is extracted from a simultaneous fit to the ` + ` − γ invariant mass distributions in all categories and is measured to be µ = 2.4 ± 0.9 for a Higgs boson mass of 125.38 GeV. The statistical significance of the observed excess of events is 2.7 standard deviations. This measurement corresponds to σ(pp → H)B(H → Zγ) = 0.21 ± 0.08 pb. The observed (expected) upper limit at 95% confidence level on µ is 4.1 (1.8), where the expected limit is calculated under the background-only hypothesis. The ratio of branching fractions B(H → Zγ)/B(H → γγ) is measured to be 1.5 +0.7 −0.6 , which agrees with the standard model prediction of 0.69 ± 0.04 at the 1.5 standard deviation level.application/pdfengThe journal of high energy physics. Trieste. No. 5 (May 2023), 233, 48 p.Aceleradores de partículasBosons de higgsColisões proton-protonBeyond Standard ModelHadron-Hadron scatteringHiggs PhysicsSearch for Higgs boson decays to a Z boson and a photon in proton-proton collisions at √s = 13 TeVEstrangeiroinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSTEXT001186847.pdf.txt001186847.pdf.txtExtracted Texttext/plain130316http://www.lume.ufrgs.br/bitstream/10183/270341/2/001186847.pdf.txtffa7dda181fadd63b75bdb1ee76d2501MD52ORIGINAL001186847.pdfTexto completo (inglês)application/pdf1416980http://www.lume.ufrgs.br/bitstream/10183/270341/1/001186847.pdfeae52282876b443476a2f8dd525a804fMD5110183/2703412023-12-20 04:21:51.026141oai:www.lume.ufrgs.br:10183/270341Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2023-12-20T06:21:51Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Search for Higgs boson decays to a Z boson and a photon in proton-proton collisions at √s = 13 TeV |
title |
Search for Higgs boson decays to a Z boson and a photon in proton-proton collisions at √s = 13 TeV |
spellingShingle |
Search for Higgs boson decays to a Z boson and a photon in proton-proton collisions at √s = 13 TeV Tumasyan, Armen Aceleradores de partículas Bosons de higgs Colisões proton-proton Beyond Standard Model Hadron-Hadron scattering Higgs Physics |
title_short |
Search for Higgs boson decays to a Z boson and a photon in proton-proton collisions at √s = 13 TeV |
title_full |
Search for Higgs boson decays to a Z boson and a photon in proton-proton collisions at √s = 13 TeV |
title_fullStr |
Search for Higgs boson decays to a Z boson and a photon in proton-proton collisions at √s = 13 TeV |
title_full_unstemmed |
Search for Higgs boson decays to a Z boson and a photon in proton-proton collisions at √s = 13 TeV |
title_sort |
Search for Higgs boson decays to a Z boson and a photon in proton-proton collisions at √s = 13 TeV |
author |
Tumasyan, Armen |
author_facet |
Tumasyan, Armen Silveira, Gustavo Gil da Bernardes, César Augusto CMS Collaboration |
author_role |
author |
author2 |
Silveira, Gustavo Gil da Bernardes, César Augusto CMS Collaboration |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
Tumasyan, Armen Silveira, Gustavo Gil da Bernardes, César Augusto CMS Collaboration |
dc.subject.por.fl_str_mv |
Aceleradores de partículas Bosons de higgs Colisões proton-proton |
topic |
Aceleradores de partículas Bosons de higgs Colisões proton-proton Beyond Standard Model Hadron-Hadron scattering Higgs Physics |
dc.subject.eng.fl_str_mv |
Beyond Standard Model Hadron-Hadron scattering Higgs Physics |
description |
Results are presented from a search for the Higgs boson decay H → Zγ, where Z → ` + ` − with ` = e or µ. The search is performed using a sample of proton-proton (pp) collision data at a center-of-mass energy of 13 TeV, recorded by the CMS experiment at the LHC, corresponding to an integrated luminosity of 138 fb−1 . Events are assigned to mutually exclusive categories, which exploit differences in both event topology and kinematics of distinct Higgs production mechanisms to enhance signal sensitivity. The signal strength µ, defined as the product of the cross section and the branching fraction [σ(pp → H)B(H → Zγ)] relative to the standard model prediction, is extracted from a simultaneous fit to the ` + ` − γ invariant mass distributions in all categories and is measured to be µ = 2.4 ± 0.9 for a Higgs boson mass of 125.38 GeV. The statistical significance of the observed excess of events is 2.7 standard deviations. This measurement corresponds to σ(pp → H)B(H → Zγ) = 0.21 ± 0.08 pb. The observed (expected) upper limit at 95% confidence level on µ is 4.1 (1.8), where the expected limit is calculated under the background-only hypothesis. The ratio of branching fractions B(H → Zγ)/B(H → γγ) is measured to be 1.5 +0.7 −0.6 , which agrees with the standard model prediction of 0.69 ± 0.04 at the 1.5 standard deviation level. |
publishDate |
2023 |
dc.date.accessioned.fl_str_mv |
2023-12-19T03:24:28Z |
dc.date.issued.fl_str_mv |
2023 |
dc.type.driver.fl_str_mv |
Estrangeiro info:eu-repo/semantics/article |
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info:eu-repo/semantics/publishedVersion |
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http://hdl.handle.net/10183/270341 |
dc.language.iso.fl_str_mv |
eng |
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eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
The journal of high energy physics. Trieste. No. 5 (May 2023), 233, 48 p. |
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info:eu-repo/semantics/openAccess |
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openAccess |
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