Measurement of properties of B0s → μ+μ− decays and search for B0→ μ+μ− with the CMS experiment
Autor(a) principal: | |
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Data de Publicação: | 2020 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/212315 |
Resumo: | Results are reported for the B0s→ μ+μ− branching fraction and effective lifetime and from a search for the decay B0→ μ+μ−. The analysis uses a data sample of proton-proton collisions accumulated by the CMS experiment in 2011, 2012, and 2016, with center-of-mass energies (integrated luminosities) of 7 TeV (5 fb−1), 8 TeV (20 fb−1), and 13 TeV (36 fb−1). The branching fractions are determined by measuring event yields relative to B+→ J/ψK+ decays (with J/ψ → μ+μ−), which results in the reduction of many of the systematic uncertainties. The decay B0s→ μ+μ− is observed with a significance of 5.6 standard deviations. The branching fraction is measured to be B(B0s→μ+μ−)=[2.9±0.7(exp)±0.2(frag)]×10−9, where the first uncertainty combines the experimental statistical and systematic contributions, and the second is due to the uncertainty in the ratio of the B0s and the B+ fragmentation functions. No significant excess is observed for the decay B0→ μ+μ−, and an upper limit of ℬ(B0 → μ+μ−) < 3.6 × 10−10 is obtained at 95% confidence level. The B0s→ μ+μ− effective lifetime is measured to be τμ+μ−=1.70+0.61−0.44 ps. These results are consistent with standard model predictions. |
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Sirunyan, A. M.Silveira, Gustavo Gil daCMS Collaboration2020-07-23T03:40:09Z20201029-8479http://hdl.handle.net/10183/212315001114759Results are reported for the B0s→ μ+μ− branching fraction and effective lifetime and from a search for the decay B0→ μ+μ−. The analysis uses a data sample of proton-proton collisions accumulated by the CMS experiment in 2011, 2012, and 2016, with center-of-mass energies (integrated luminosities) of 7 TeV (5 fb−1), 8 TeV (20 fb−1), and 13 TeV (36 fb−1). The branching fractions are determined by measuring event yields relative to B+→ J/ψK+ decays (with J/ψ → μ+μ−), which results in the reduction of many of the systematic uncertainties. The decay B0s→ μ+μ− is observed with a significance of 5.6 standard deviations. The branching fraction is measured to be B(B0s→μ+μ−)=[2.9±0.7(exp)±0.2(frag)]×10−9, where the first uncertainty combines the experimental statistical and systematic contributions, and the second is due to the uncertainty in the ratio of the B0s and the B+ fragmentation functions. No significant excess is observed for the decay B0→ μ+μ−, and an upper limit of ℬ(B0 → μ+μ−) < 3.6 × 10−10 is obtained at 95% confidence level. The B0s→ μ+μ− effective lifetime is measured to be τμ+μ−=1.70+0.61−0.44 ps. These results are consistent with standard model predictions.application/pdfengThe journal of high energy physics. Trieste. No. 4 (Apr. 2020), 188, 48 p.Aceleradores de partículasColisões proton-protonHadronsB physicsHadron-Hadron scattering (experiments)Measurement of properties of B0s → μ+μ− decays and search for B0→ μ+μ− with the CMS experimentEstrangeiroinfo: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:UFRGSTEXT001114759.pdf.txt001114759.pdf.txtExtracted Texttext/plain136093http://www.lume.ufrgs.br/bitstream/10183/212315/2/001114759.pdf.txtbd097e4f31f323aab2726a3593f3e8a4MD52ORIGINAL001114759.pdfTexto completo (inglês)application/pdf919153http://www.lume.ufrgs.br/bitstream/10183/212315/1/001114759.pdf3437592fbfe52400703a550d9376a594MD5110183/2123152023-07-22 03:40:30.627653oai:www.lume.ufrgs.br:10183/212315Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2023-07-22T06:40:30Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Measurement of properties of B0s → μ+μ− decays and search for B0→ μ+μ− with the CMS experiment |
title |
Measurement of properties of B0s → μ+μ− decays and search for B0→ μ+μ− with the CMS experiment |
spellingShingle |
Measurement of properties of B0s → μ+μ− decays and search for B0→ μ+μ− with the CMS experiment Sirunyan, A. M. Aceleradores de partículas Colisões proton-proton Hadrons B physics Hadron-Hadron scattering (experiments) |
title_short |
Measurement of properties of B0s → μ+μ− decays and search for B0→ μ+μ− with the CMS experiment |
title_full |
Measurement of properties of B0s → μ+μ− decays and search for B0→ μ+μ− with the CMS experiment |
title_fullStr |
Measurement of properties of B0s → μ+μ− decays and search for B0→ μ+μ− with the CMS experiment |
title_full_unstemmed |
Measurement of properties of B0s → μ+μ− decays and search for B0→ μ+μ− with the CMS experiment |
title_sort |
Measurement of properties of B0s → μ+μ− decays and search for B0→ μ+μ− with the CMS experiment |
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 Hadrons |
topic |
Aceleradores de partículas Colisões proton-proton Hadrons B physics Hadron-Hadron scattering (experiments) |
dc.subject.eng.fl_str_mv |
B physics Hadron-Hadron scattering (experiments) |
description |
Results are reported for the B0s→ μ+μ− branching fraction and effective lifetime and from a search for the decay B0→ μ+μ−. The analysis uses a data sample of proton-proton collisions accumulated by the CMS experiment in 2011, 2012, and 2016, with center-of-mass energies (integrated luminosities) of 7 TeV (5 fb−1), 8 TeV (20 fb−1), and 13 TeV (36 fb−1). The branching fractions are determined by measuring event yields relative to B+→ J/ψK+ decays (with J/ψ → μ+μ−), which results in the reduction of many of the systematic uncertainties. The decay B0s→ μ+μ− is observed with a significance of 5.6 standard deviations. The branching fraction is measured to be B(B0s→μ+μ−)=[2.9±0.7(exp)±0.2(frag)]×10−9, where the first uncertainty combines the experimental statistical and systematic contributions, and the second is due to the uncertainty in the ratio of the B0s and the B+ fragmentation functions. No significant excess is observed for the decay B0→ μ+μ−, and an upper limit of ℬ(B0 → μ+μ−) < 3.6 × 10−10 is obtained at 95% confidence level. The B0s→ μ+μ− effective lifetime is measured to be τμ+μ−=1.70+0.61−0.44 ps. These results are consistent with standard model predictions. |
publishDate |
2020 |
dc.date.accessioned.fl_str_mv |
2020-07-23T03:40:09Z |
dc.date.issued.fl_str_mv |
2020 |
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/10183/212315 |
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001114759 |
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http://hdl.handle.net/10183/212315 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
The journal of high energy physics. Trieste. No. 4 (Apr. 2020), 188, 48 p. |
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info:eu-repo/semantics/openAccess |
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openAccess |
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