Measurement of the Higgs boson width and evidence of its off-shell contributions to ZZ production
Autor(a) principal: | |
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Data de Publicação: | 2022 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/254250 |
Resumo: | Since the discovery of the Higgs boson in 2012, detailed studies of its properties have been ongoing. Besides its mass, its width—related to its lifetime—is an important parameter. One way to determine this quantity is to measure its off-shell production, where the Higgs boson mass is far away from its nominal value, and relating it to its on-shell production, where the mass is close to the nominal value. Here we report evidence for such off-shell contributions to the production cross-section of two Z bosons with data from the CMS experiment at the CERN Large Hadron Collider. We constrain the total rate of the off-shell Higgs boson contribution beyond the Z boson pair production threshold, relative to its standard model expectation, to the interval [0.0061, 2.0] at the 95% confidence level. The scenario with no off-shell contribution is excluded at a p-value of 0.0003 (3.6 standard deviations). We measure the width of the Higgs boson as ΓH = 3.2+2.4 −1.7 MeV, in agreement with the standard model expectation of 4.1 MeV. In addition, we set constraints on anomalous Higgs boson couplings to W and Z boson pairs. |
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Sirunyan, A. M.Silveira, Gustavo Gil daBernardes, César AugustoCMS Collaboration2023-02-07T05:02:14Z20221745-2481http://hdl.handle.net/10183/254250001160070Since the discovery of the Higgs boson in 2012, detailed studies of its properties have been ongoing. Besides its mass, its width—related to its lifetime—is an important parameter. One way to determine this quantity is to measure its off-shell production, where the Higgs boson mass is far away from its nominal value, and relating it to its on-shell production, where the mass is close to the nominal value. Here we report evidence for such off-shell contributions to the production cross-section of two Z bosons with data from the CMS experiment at the CERN Large Hadron Collider. We constrain the total rate of the off-shell Higgs boson contribution beyond the Z boson pair production threshold, relative to its standard model expectation, to the interval [0.0061, 2.0] at the 95% confidence level. The scenario with no off-shell contribution is excluded at a p-value of 0.0003 (3.6 standard deviations). We measure the width of the Higgs boson as ΓH = 3.2+2.4 −1.7 MeV, in agreement with the standard model expectation of 4.1 MeV. In addition, we set constraints on anomalous Higgs boson couplings to W and Z boson pairs.application/pdfengNature Physics. London. Vol. 18, no. 11 (Nov. 2022), p. 1329–1334Aceleradores de partículasBosons de higgsBosons ZMeasurement of the Higgs boson width and evidence of its off-shell contributions to ZZ productionEstrangeiroinfo: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:UFRGSTEXT001160070.pdf.txt001160070.pdf.txtExtracted Texttext/plain133156http://www.lume.ufrgs.br/bitstream/10183/254250/2/001160070.pdf.txt9a7568bdb806f956248da357c8395fd7MD52ORIGINAL001160070.pdfTexto completo (inglês)application/pdf3750110http://www.lume.ufrgs.br/bitstream/10183/254250/1/001160070.pdfe8690dad3e1513362197fe996b842f92MD5110183/2542502023-07-08 03:34:49.331929oai:www.lume.ufrgs.br:10183/254250Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2023-07-08T06:34:49Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Measurement of the Higgs boson width and evidence of its off-shell contributions to ZZ production |
title |
Measurement of the Higgs boson width and evidence of its off-shell contributions to ZZ production |
spellingShingle |
Measurement of the Higgs boson width and evidence of its off-shell contributions to ZZ production Sirunyan, A. M. Aceleradores de partículas Bosons de higgs Bosons Z |
title_short |
Measurement of the Higgs boson width and evidence of its off-shell contributions to ZZ production |
title_full |
Measurement of the Higgs boson width and evidence of its off-shell contributions to ZZ production |
title_fullStr |
Measurement of the Higgs boson width and evidence of its off-shell contributions to ZZ production |
title_full_unstemmed |
Measurement of the Higgs boson width and evidence of its off-shell contributions to ZZ production |
title_sort |
Measurement of the Higgs boson width and evidence of its off-shell contributions to ZZ production |
author |
Sirunyan, A. M. |
author_facet |
Sirunyan, A. M. 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 |
Sirunyan, A. M. Silveira, Gustavo Gil da Bernardes, César Augusto CMS Collaboration |
dc.subject.por.fl_str_mv |
Aceleradores de partículas Bosons de higgs Bosons Z |
topic |
Aceleradores de partículas Bosons de higgs Bosons Z |
description |
Since the discovery of the Higgs boson in 2012, detailed studies of its properties have been ongoing. Besides its mass, its width—related to its lifetime—is an important parameter. One way to determine this quantity is to measure its off-shell production, where the Higgs boson mass is far away from its nominal value, and relating it to its on-shell production, where the mass is close to the nominal value. Here we report evidence for such off-shell contributions to the production cross-section of two Z bosons with data from the CMS experiment at the CERN Large Hadron Collider. We constrain the total rate of the off-shell Higgs boson contribution beyond the Z boson pair production threshold, relative to its standard model expectation, to the interval [0.0061, 2.0] at the 95% confidence level. The scenario with no off-shell contribution is excluded at a p-value of 0.0003 (3.6 standard deviations). We measure the width of the Higgs boson as ΓH = 3.2+2.4 −1.7 MeV, in agreement with the standard model expectation of 4.1 MeV. In addition, we set constraints on anomalous Higgs boson couplings to W and Z boson pairs. |
publishDate |
2022 |
dc.date.issued.fl_str_mv |
2022 |
dc.date.accessioned.fl_str_mv |
2023-02-07T05:02:14Z |
dc.type.driver.fl_str_mv |
Estrangeiro info:eu-repo/semantics/article |
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info:eu-repo/semantics/publishedVersion |
format |
article |
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publishedVersion |
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http://hdl.handle.net/10183/254250 |
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1745-2481 |
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001160070 |
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http://hdl.handle.net/10183/254250 |
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eng |
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eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Nature Physics. London. Vol. 18, no. 11 (Nov. 2022), p. 1329–1334 |
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openAccess |
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