Observation of τ lepton pair production in ultraperipheral Pb-Pb collisions at √sNN = 5.02 TeV

Detalhes bibliográficos
Autor(a) principal: Tumasyan, Armen
Data de Publicação: 2023
Outros Autores: Silveira, Gustavo Gil da, Bernardes, César Augusto, CMS Collaboration
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFRGS
Texto Completo: http://hdl.handle.net/10183/272304
Resumo: We present an observation of photon-photon production of τ lepton pairs in ultraperipheral lead-lead collisions. The measurement is based on a data sample with an integrated luminosity of 404 μb−1 collected by the CMS experiment at a center-of-mass energy per nucleon pair of √sNN = 5.02 TeV. The γγ → τ+ τ− process is observed for τ+ τ− events with a muon and three charged hadrons in the final state. The measured fiducial cross section is σ (γγ → τ+ τ−) = 4.8 ± 0.6 (stat) ± 0.5 (syst) μb, where the second (third) term corresponds to the statistical (systematic) uncertainty in σ (γγ → τ+ τ−) in agreement with leading-order QED predictions. Using σ (γγ → τ+ τ−), we estimate a model-dependent value of the anomalous magnetic moment of the τ lepton of a τ = 0.00 1 + 0.055 − 0.089.
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spelling Tumasyan, ArmenSilveira, Gustavo Gil daBernardes, César AugustoCMS Collaboration2024-02-28T05:03:30Z20230031-9007http://hdl.handle.net/10183/272304001196807We present an observation of photon-photon production of τ lepton pairs in ultraperipheral lead-lead collisions. The measurement is based on a data sample with an integrated luminosity of 404 μb−1 collected by the CMS experiment at a center-of-mass energy per nucleon pair of √sNN = 5.02 TeV. The γγ → τ+ τ− process is observed for τ+ τ− events with a muon and three charged hadrons in the final state. The measured fiducial cross section is σ (γγ → τ+ τ−) = 4.8 ± 0.6 (stat) ± 0.5 (syst) μb, where the second (third) term corresponds to the statistical (systematic) uncertainty in σ (γγ → τ+ τ−) in agreement with leading-order QED predictions. Using σ (γγ → τ+ τ−), we estimate a model-dependent value of the anomalous magnetic moment of the τ lepton of a τ = 0.00 1 + 0.055 − 0.089.application/pdfengPhysical review letters. Melville. Vol. 131, no. 15 (Oct. 2023), 151803, 18 p.Aceleradores de partículasColisao de ions pesadosObservation of τ lepton pair production in ultraperipheral Pb-Pb collisions 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:UFRGSTEXT001196807.pdf.txt001196807.pdf.txtExtracted Texttext/plain88190http://www.lume.ufrgs.br/bitstream/10183/272304/2/001196807.pdf.txt1386f489d059271a32ccb18ba8fde0a1MD52ORIGINAL001196807.pdfTexto completo (inglês)application/pdf37523461http://www.lume.ufrgs.br/bitstream/10183/272304/1/001196807.pdf5d34d01519e5bda2972128e0894c8460MD5110183/2723042024-02-29 04:59:25.060541oai:www.lume.ufrgs.br:10183/272304Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2024-02-29T07:59:25Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false
dc.title.pt_BR.fl_str_mv Observation of τ lepton pair production in ultraperipheral Pb-Pb collisions at √sNN = 5.02 TeV
title Observation of τ lepton pair production in ultraperipheral Pb-Pb collisions at √sNN = 5.02 TeV
spellingShingle Observation of τ lepton pair production in ultraperipheral Pb-Pb collisions at √sNN = 5.02 TeV
Tumasyan, Armen
Aceleradores de partículas
Colisao de ions pesados
title_short Observation of τ lepton pair production in ultraperipheral Pb-Pb collisions at √sNN = 5.02 TeV
title_full Observation of τ lepton pair production in ultraperipheral Pb-Pb collisions at √sNN = 5.02 TeV
title_fullStr Observation of τ lepton pair production in ultraperipheral Pb-Pb collisions at √sNN = 5.02 TeV
title_full_unstemmed Observation of τ lepton pair production in ultraperipheral Pb-Pb collisions at √sNN = 5.02 TeV
title_sort Observation of τ lepton pair production in ultraperipheral Pb-Pb collisions at √sNN = 5.02 TeV
author Tumasyan, Armen
author_facet Tumasyan, Armen
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 Tumasyan, Armen
Silveira, Gustavo Gil da
Bernardes, César Augusto
CMS Collaboration
dc.subject.por.fl_str_mv Aceleradores de partículas
Colisao de ions pesados
topic Aceleradores de partículas
Colisao de ions pesados
description We present an observation of photon-photon production of τ lepton pairs in ultraperipheral lead-lead collisions. The measurement is based on a data sample with an integrated luminosity of 404 μb−1 collected by the CMS experiment at a center-of-mass energy per nucleon pair of √sNN = 5.02 TeV. The γγ → τ+ τ− process is observed for τ+ τ− events with a muon and three charged hadrons in the final state. The measured fiducial cross section is σ (γγ → τ+ τ−) = 4.8 ± 0.6 (stat) ± 0.5 (syst) μb, where the second (third) term corresponds to the statistical (systematic) uncertainty in σ (γγ → τ+ τ−) in agreement with leading-order QED predictions. Using σ (γγ → τ+ τ−), we estimate a model-dependent value of the anomalous magnetic moment of the τ lepton of a τ = 0.00 1 + 0.055 − 0.089.
publishDate 2023
dc.date.issued.fl_str_mv 2023
dc.date.accessioned.fl_str_mv 2024-02-28T05:03:30Z
dc.type.driver.fl_str_mv Estrangeiro
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dc.identifier.uri.fl_str_mv http://hdl.handle.net/10183/272304
dc.identifier.issn.pt_BR.fl_str_mv 0031-9007
dc.identifier.nrb.pt_BR.fl_str_mv 001196807
identifier_str_mv 0031-9007
001196807
url http://hdl.handle.net/10183/272304
dc.language.iso.fl_str_mv eng
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dc.relation.ispartof.pt_BR.fl_str_mv Physical review letters. Melville. Vol. 131, no. 15 (Oct. 2023), 151803, 18 p.
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dc.format.none.fl_str_mv application/pdf
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reponame_str Repositório Institucional da UFRGS
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