Constraints on the initial state of Pb-Pb collisions via measurements of Z-boson yields and azimuthal anisotropy at √snn=5.02 TeV
Autor(a) principal: | |
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Data de Publicação: | 2021 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/235099 |
Resumo: | The CMS experiment at the LHC has measured the differential cross sections of Z bosons decaying to pairs of leptons, as functions of transverse momentum and rapidity, in lead-lead collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV. The measured Z boson elliptic azimuthal anisotropy coefficient is compatible with zero, showing that Z bosons do not experience significant final-state interactions in the medium produced in the collision. Yields of Z bosons are compared to Glauber model predictions and are found to deviate from these expectations in peripheral collisions, indicating the presence of initial collision geometry and centrality selection effects. The precision of the measurement allows, for the first time, for a data-driven determination of the nucleon-nucleon integrated luminosity as a function of lead-lead centrality, thereby eliminating the need for its estimation based on a Glauber model. |
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Sirunyan, A. M.Silveira, Gustavo Gil daCMS Collaboration2022-02-12T04:53:08Z20210031-9007http://hdl.handle.net/10183/235099001132004The CMS experiment at the LHC has measured the differential cross sections of Z bosons decaying to pairs of leptons, as functions of transverse momentum and rapidity, in lead-lead collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV. The measured Z boson elliptic azimuthal anisotropy coefficient is compatible with zero, showing that Z bosons do not experience significant final-state interactions in the medium produced in the collision. Yields of Z bosons are compared to Glauber model predictions and are found to deviate from these expectations in peripheral collisions, indicating the presence of initial collision geometry and centrality selection effects. The precision of the measurement allows, for the first time, for a data-driven determination of the nucleon-nucleon integrated luminosity as a function of lead-lead centrality, thereby eliminating the need for its estimation based on a Glauber model.application/pdfengPhysical review letters. Melville. Vol. 127, no. 10 (Aug. 2021), 102002, 19 p.Aceleradores de partículasColisao de ions pesadosBosons ZConstraints on the initial state of Pb-Pb collisions via measurements of Z-boson yields and azimuthal anisotropy at √snn=5.02 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:UFRGSTEXT001132004.pdf.txt001132004.pdf.txtExtracted Texttext/plain94473http://www.lume.ufrgs.br/bitstream/10183/235099/2/001132004.pdf.txt8e3898fec58763c2bcbd9160074279a1MD52ORIGINAL001132004.pdfTexto completo (inglês)application/pdf602324http://www.lume.ufrgs.br/bitstream/10183/235099/1/001132004.pdf5c13067baa02952f34ac79dfc4cac805MD5110183/2350992023-07-22 03:41:21.199569oai:www.lume.ufrgs.br:10183/235099Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2023-07-22T06:41:21Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Constraints on the initial state of Pb-Pb collisions via measurements of Z-boson yields and azimuthal anisotropy at √snn=5.02 TeV |
title |
Constraints on the initial state of Pb-Pb collisions via measurements of Z-boson yields and azimuthal anisotropy at √snn=5.02 TeV |
spellingShingle |
Constraints on the initial state of Pb-Pb collisions via measurements of Z-boson yields and azimuthal anisotropy at √snn=5.02 TeV Sirunyan, A. M. Aceleradores de partículas Colisao de ions pesados Bosons Z |
title_short |
Constraints on the initial state of Pb-Pb collisions via measurements of Z-boson yields and azimuthal anisotropy at √snn=5.02 TeV |
title_full |
Constraints on the initial state of Pb-Pb collisions via measurements of Z-boson yields and azimuthal anisotropy at √snn=5.02 TeV |
title_fullStr |
Constraints on the initial state of Pb-Pb collisions via measurements of Z-boson yields and azimuthal anisotropy at √snn=5.02 TeV |
title_full_unstemmed |
Constraints on the initial state of Pb-Pb collisions via measurements of Z-boson yields and azimuthal anisotropy at √snn=5.02 TeV |
title_sort |
Constraints on the initial state of Pb-Pb collisions via measurements of Z-boson yields and azimuthal anisotropy at √snn=5.02 TeV |
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 Colisao de ions pesados Bosons Z |
topic |
Aceleradores de partículas Colisao de ions pesados Bosons Z |
description |
The CMS experiment at the LHC has measured the differential cross sections of Z bosons decaying to pairs of leptons, as functions of transverse momentum and rapidity, in lead-lead collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV. The measured Z boson elliptic azimuthal anisotropy coefficient is compatible with zero, showing that Z bosons do not experience significant final-state interactions in the medium produced in the collision. Yields of Z bosons are compared to Glauber model predictions and are found to deviate from these expectations in peripheral collisions, indicating the presence of initial collision geometry and centrality selection effects. The precision of the measurement allows, for the first time, for a data-driven determination of the nucleon-nucleon integrated luminosity as a function of lead-lead centrality, thereby eliminating the need for its estimation based on a Glauber model. |
publishDate |
2021 |
dc.date.issued.fl_str_mv |
2021 |
dc.date.accessioned.fl_str_mv |
2022-02-12T04:53:08Z |
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Estrangeiro info:eu-repo/semantics/article |
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info:eu-repo/semantics/publishedVersion |
format |
article |
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http://hdl.handle.net/10183/235099 |
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001132004 |
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http://hdl.handle.net/10183/235099 |
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eng |
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dc.relation.ispartof.pt_BR.fl_str_mv |
Physical review letters. Melville. Vol. 127, no. 10 (Aug. 2021), 102002, 19 p. |
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