Observation of the rare decay of the η meson to four muons
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/10183/272239 |
Resumo: | A search for the rare η → μ+ μ− μ+ μ− double-Dalitz decay is performed using a sample of proton-proton collisions, collected by the CMS experiment at the CERN LHC with high-rate muon triggers during 2017 and 2018 and corresponding to an integrated luminosity of 101 fb−1. A signal having a statistical significance well in excess of 5 standard deviations is observed. Using the η → μ+ μ− decay as normalization, the branching fraction B (η → μ+ μ− μ+ μ−) = [5.0 ± 0.8 (stat) ± 0.7 (syst) ± 0.7 (B 2 μ)] × 10−9 is measured, where the last term is the uncertainty in the normalization channel branching fraction. This work achieves an improved precision of over 5 orders of magnitude compared to previous results, leading to the first measurement of this branching fraction, which is found to agree with theoretical predictions. |
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Hayrapetyan, AramSilveira, Gustavo Gil daBernardes, César AugustoCMS Collaboration2024-02-28T05:02:14Z20230031-9007http://hdl.handle.net/10183/272239001196833A search for the rare η → μ+ μ− μ+ μ− double-Dalitz decay is performed using a sample of proton-proton collisions, collected by the CMS experiment at the CERN LHC with high-rate muon triggers during 2017 and 2018 and corresponding to an integrated luminosity of 101 fb−1. A signal having a statistical significance well in excess of 5 standard deviations is observed. Using the η → μ+ μ− decay as normalization, the branching fraction B (η → μ+ μ− μ+ μ−) = [5.0 ± 0.8 (stat) ± 0.7 (syst) ± 0.7 (B 2 μ)] × 10−9 is measured, where the last term is the uncertainty in the normalization channel branching fraction. This work achieves an improved precision of over 5 orders of magnitude compared to previous results, leading to the first measurement of this branching fraction, which is found to agree with theoretical predictions.application/pdfengPhysical review letters. Melville. Vol. 131, no. 9 (Sept. 2023), 091903, 19 p.Aceleradores de partículasColisões proton-protonMuonsObservation of the rare decay of the η meson to four muonsEstrangeiroinfo: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:UFRGSTEXT001196833.pdf.txt001196833.pdf.txtExtracted Texttext/plain88352http://www.lume.ufrgs.br/bitstream/10183/272239/2/001196833.pdf.txte0d1672b704ea6274355f91f2546886aMD52ORIGINAL001196833.pdfTexto completo (inglês)application/pdf37318560http://www.lume.ufrgs.br/bitstream/10183/272239/1/001196833.pdf501dae7639c73b8bd9e170f2abfde27fMD5110183/2722392024-02-29 04:57:23.531812oai:www.lume.ufrgs.br:10183/272239Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2024-02-29T07:57:23Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Observation of the rare decay of the η meson to four muons |
title |
Observation of the rare decay of the η meson to four muons |
spellingShingle |
Observation of the rare decay of the η meson to four muons Hayrapetyan, Aram Aceleradores de partículas Colisões proton-proton Muons |
title_short |
Observation of the rare decay of the η meson to four muons |
title_full |
Observation of the rare decay of the η meson to four muons |
title_fullStr |
Observation of the rare decay of the η meson to four muons |
title_full_unstemmed |
Observation of the rare decay of the η meson to four muons |
title_sort |
Observation of the rare decay of the η meson to four muons |
author |
Hayrapetyan, Aram |
author_facet |
Hayrapetyan, Aram 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 |
Hayrapetyan, Aram Silveira, Gustavo Gil da Bernardes, César Augusto CMS Collaboration |
dc.subject.por.fl_str_mv |
Aceleradores de partículas Colisões proton-proton Muons |
topic |
Aceleradores de partículas Colisões proton-proton Muons |
description |
A search for the rare η → μ+ μ− μ+ μ− double-Dalitz decay is performed using a sample of proton-proton collisions, collected by the CMS experiment at the CERN LHC with high-rate muon triggers during 2017 and 2018 and corresponding to an integrated luminosity of 101 fb−1. A signal having a statistical significance well in excess of 5 standard deviations is observed. Using the η → μ+ μ− decay as normalization, the branching fraction B (η → μ+ μ− μ+ μ−) = [5.0 ± 0.8 (stat) ± 0.7 (syst) ± 0.7 (B 2 μ)] × 10−9 is measured, where the last term is the uncertainty in the normalization channel branching fraction. This work achieves an improved precision of over 5 orders of magnitude compared to previous results, leading to the first measurement of this branching fraction, which is found to agree with theoretical predictions. |
publishDate |
2023 |
dc.date.issued.fl_str_mv |
2023 |
dc.date.accessioned.fl_str_mv |
2024-02-28T05:02:14Z |
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/10183/272239 |
dc.identifier.issn.pt_BR.fl_str_mv |
0031-9007 |
dc.identifier.nrb.pt_BR.fl_str_mv |
001196833 |
identifier_str_mv |
0031-9007 001196833 |
url |
http://hdl.handle.net/10183/272239 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Physical review letters. Melville. Vol. 131, no. 9 (Sept. 2023), 091903, 19 p. |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
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reponame:Repositório Institucional da UFRGS instname:Universidade Federal do Rio Grande do Sul (UFRGS) instacron:UFRGS |
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