Search for rare decays of Z and Higgs bosons to J/ψ and a photon in proton-proton collisions at √s = 13TeV
Autor(a) principal: | |
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Data de Publicação: | 2019 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/194650 |
Resumo: | A search is presented for decays of Z and Higgs bosons to a J/ψ meson and a photon, with the subsequent decay of the J/ψ to μ + μ −. The analysis uses data from proton-proton collisions with an integrated luminosity of 35.9 fb−1 at √ s = 13 TeV collected with the CMS detector at the LHC. The observed limit on the Z → J/ψγ decay branching fraction, assuming that the J/ψ meson is produced unpolarized, is 1.4 × 10−6 at 95% confidence level, which corresponds to a rate higher than expected in the standard model by a factor of 15. For extreme-polarization scenarios, the observed limit changes from −13.6 to +8.6% with respect to the unpolarized scenario. The observed upper limit on the branching fraction for H → J/ψγ where the J/ψ meson is assumed to be transversely polarized is 7.6×10−4, a factor of 260 larger than the standard model prediction. The results for the Higgs boson are combined with previous data from proton-proton collisions at √ s = 8 TeV to produce an observed upper limit on the branching fraction for H → J/ψγ that is a factor of 220 larger than the standard model value. |
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Sirunyan, A. M.Silveira, Gustavo Gil daCMS Collaboration2019-05-28T02:36:57Z20191434-6044http://hdl.handle.net/10183/194650001088903A search is presented for decays of Z and Higgs bosons to a J/ψ meson and a photon, with the subsequent decay of the J/ψ to μ + μ −. The analysis uses data from proton-proton collisions with an integrated luminosity of 35.9 fb−1 at √ s = 13 TeV collected with the CMS detector at the LHC. The observed limit on the Z → J/ψγ decay branching fraction, assuming that the J/ψ meson is produced unpolarized, is 1.4 × 10−6 at 95% confidence level, which corresponds to a rate higher than expected in the standard model by a factor of 15. For extreme-polarization scenarios, the observed limit changes from −13.6 to +8.6% with respect to the unpolarized scenario. The observed upper limit on the branching fraction for H → J/ψγ where the J/ψ meson is assumed to be transversely polarized is 7.6×10−4, a factor of 260 larger than the standard model prediction. The results for the Higgs boson are combined with previous data from proton-proton collisions at √ s = 8 TeV to produce an observed upper limit on the branching fraction for H → J/ψγ that is a factor of 220 larger than the standard model value.application/pdfengThe European physical journal. C, Particles and fields. Berlin. Vol. 79, no. 2 (Feb. 2019), 94, 27 p.Aceleradores de partículasColisões proton-protonBosons de higgsBosons ZMésons psiSearch for rare decays of Z and Higgs bosons to J/ψ and a photon in proton-proton collisions at √s = 13TeVEstrangeiroinfo: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:UFRGSTEXT001088903.pdf.txt001088903.pdf.txtExtracted Texttext/plain107262http://www.lume.ufrgs.br/bitstream/10183/194650/2/001088903.pdf.txt2874c59fa2f4e22abb6256cf706d0642MD52ORIGINAL001088903.pdfTexto completo (inglês)application/pdf878448http://www.lume.ufrgs.br/bitstream/10183/194650/1/001088903.pdf732bbf36d4cb60163c8a82352c36abf3MD5110183/1946502023-08-03 03:32:30.896538oai:www.lume.ufrgs.br:10183/194650Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2023-08-03T06:32:30Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Search for rare decays of Z and Higgs bosons to J/ψ and a photon in proton-proton collisions at √s = 13TeV |
title |
Search for rare decays of Z and Higgs bosons to J/ψ and a photon in proton-proton collisions at √s = 13TeV |
spellingShingle |
Search for rare decays of Z and Higgs bosons to J/ψ and a photon in proton-proton collisions at √s = 13TeV Sirunyan, A. M. Aceleradores de partículas Colisões proton-proton Bosons de higgs Bosons Z Mésons psi |
title_short |
Search for rare decays of Z and Higgs bosons to J/ψ and a photon in proton-proton collisions at √s = 13TeV |
title_full |
Search for rare decays of Z and Higgs bosons to J/ψ and a photon in proton-proton collisions at √s = 13TeV |
title_fullStr |
Search for rare decays of Z and Higgs bosons to J/ψ and a photon in proton-proton collisions at √s = 13TeV |
title_full_unstemmed |
Search for rare decays of Z and Higgs bosons to J/ψ and a photon in proton-proton collisions at √s = 13TeV |
title_sort |
Search for rare decays of Z and Higgs bosons to J/ψ and a photon in proton-proton collisions at √s = 13TeV |
author |
Sirunyan, A. M. |
author_facet |
Sirunyan, A. M. Silveira, Gustavo Gil da CMS Collaboration |
author_role |
author |
author2 |
Silveira, Gustavo Gil da CMS Collaboration |
author2_role |
author author |
dc.contributor.author.fl_str_mv |
Sirunyan, A. M. Silveira, Gustavo Gil da CMS Collaboration |
dc.subject.por.fl_str_mv |
Aceleradores de partículas Colisões proton-proton Bosons de higgs Bosons Z Mésons psi |
topic |
Aceleradores de partículas Colisões proton-proton Bosons de higgs Bosons Z Mésons psi |
description |
A search is presented for decays of Z and Higgs bosons to a J/ψ meson and a photon, with the subsequent decay of the J/ψ to μ + μ −. The analysis uses data from proton-proton collisions with an integrated luminosity of 35.9 fb−1 at √ s = 13 TeV collected with the CMS detector at the LHC. The observed limit on the Z → J/ψγ decay branching fraction, assuming that the J/ψ meson is produced unpolarized, is 1.4 × 10−6 at 95% confidence level, which corresponds to a rate higher than expected in the standard model by a factor of 15. For extreme-polarization scenarios, the observed limit changes from −13.6 to +8.6% with respect to the unpolarized scenario. The observed upper limit on the branching fraction for H → J/ψγ where the J/ψ meson is assumed to be transversely polarized is 7.6×10−4, a factor of 260 larger than the standard model prediction. The results for the Higgs boson are combined with previous data from proton-proton collisions at √ s = 8 TeV to produce an observed upper limit on the branching fraction for H → J/ψγ that is a factor of 220 larger than the standard model value. |
publishDate |
2019 |
dc.date.accessioned.fl_str_mv |
2019-05-28T02:36:57Z |
dc.date.issued.fl_str_mv |
2019 |
dc.type.driver.fl_str_mv |
Estrangeiro info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10183/194650 |
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1434-6044 |
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001088903 |
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http://hdl.handle.net/10183/194650 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
The European physical journal. C, Particles and fields. Berlin. Vol. 79, no. 2 (Feb. 2019), 94, 27 p. |
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info:eu-repo/semantics/openAccess |
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openAccess |
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application/pdf |
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