Inclusive and differential cross section measurements of single top quark production in association with a Z boson in proton-proton collisions at √s = 13 TeV

Detalhes bibliográficos
Autor(a) principal: Tumasyan, Armen
Data de Publicação: 2022
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/10183/237127
Resumo: Inclusive and differential cross sections of single top quark production in as sociation with a Z boson are measured in proton-proton collisions at a center-of-mass energy of 13 TeV with a data sample corresponding to an integrated luminosity of 138 fb−1 recorded by the CMS experiment. Events are selected based on the presence of three lep tons, electrons or muons, associated with leptonic Z boson and top quark decays. The measurement yields an inclusive cross section of 87.9 +7.5 −7.3 (stat)+7.3 −6.0 (syst) fb for a dilepton invariant mass greater than 30 GeV, in agreement with standard model (SM) calculations and represents the most precise determination to date. The ratio between the cross sec tions for the top quark and the top antiquark production in association with a Z boson is measured as 2.37+0.56 −0.42 (stat)+0.27 −0.13 (syst). Differential measurements at parton and particle levels are performed for the first time. Several kinematic observables are considered to study the modeling of the process. Results are compared to theoretical predictions with different assumptions on the source of the initial-state b quark and found to be in agree ment, within the uncertainties. Additionally, the spin asymmetry, which is sensitive to the top quark polarization, is determined from the differential distribution of the polarization angle at parton level to be 0.54±0.16 (stat)±0.06 (syst), in agreement with SM predictions.
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spelling Tumasyan, ArmenSilveira, Gustavo Gil daBernardes, César AugustoCMS Collaboration2022-04-13T04:51:17Z20221029-8479http://hdl.handle.net/10183/237127001138424Inclusive and differential cross sections of single top quark production in as sociation with a Z boson are measured in proton-proton collisions at a center-of-mass energy of 13 TeV with a data sample corresponding to an integrated luminosity of 138 fb−1 recorded by the CMS experiment. Events are selected based on the presence of three lep tons, electrons or muons, associated with leptonic Z boson and top quark decays. The measurement yields an inclusive cross section of 87.9 +7.5 −7.3 (stat)+7.3 −6.0 (syst) fb for a dilepton invariant mass greater than 30 GeV, in agreement with standard model (SM) calculations and represents the most precise determination to date. The ratio between the cross sec tions for the top quark and the top antiquark production in association with a Z boson is measured as 2.37+0.56 −0.42 (stat)+0.27 −0.13 (syst). Differential measurements at parton and particle levels are performed for the first time. Several kinematic observables are considered to study the modeling of the process. Results are compared to theoretical predictions with different assumptions on the source of the initial-state b quark and found to be in agree ment, within the uncertainties. Additionally, the spin asymmetry, which is sensitive to the top quark polarization, is determined from the differential distribution of the polarization angle at parton level to be 0.54±0.16 (stat)±0.06 (syst), in agreement with SM predictions.application/pdfengThe journal of high energy physics. Trieste. No. 2 (Feb. 2022), 107, 66 p.Aceleradores de partículasColisões proton-protonBosons ZHadron-Hadron scatteringTop PhysicsInclusive and differential cross section measurements of single top quark production in association with a Z boson in proton-proton collisions at √s = 13 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:UFRGSTEXT001138424.pdf.txt001138424.pdf.txtExtracted Texttext/plain171663http://www.lume.ufrgs.br/bitstream/10183/237127/2/001138424.pdf.txt0222751e9f21ff7aa2d356262d0d4555MD52ORIGINAL001138424.pdfTexto completo (inglês)application/pdf3429302http://www.lume.ufrgs.br/bitstream/10183/237127/1/001138424.pdfaa107e51f8fc0dbe1a8e156d61db453fMD5110183/2371272023-07-08 03:34:38.067201oai:www.lume.ufrgs.br:10183/237127Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2023-07-08T06:34:38Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false
dc.title.pt_BR.fl_str_mv Inclusive and differential cross section measurements of single top quark production in association with a Z boson in proton-proton collisions at √s = 13 TeV
title Inclusive and differential cross section measurements of single top quark production in association with a Z boson in proton-proton collisions at √s = 13 TeV
spellingShingle Inclusive and differential cross section measurements of single top quark production in association with a Z boson in proton-proton collisions at √s = 13 TeV
Tumasyan, Armen
Aceleradores de partículas
Colisões proton-proton
Bosons Z
Hadron-Hadron scattering
Top Physics
title_short Inclusive and differential cross section measurements of single top quark production in association with a Z boson in proton-proton collisions at √s = 13 TeV
title_full Inclusive and differential cross section measurements of single top quark production in association with a Z boson in proton-proton collisions at √s = 13 TeV
title_fullStr Inclusive and differential cross section measurements of single top quark production in association with a Z boson in proton-proton collisions at √s = 13 TeV
title_full_unstemmed Inclusive and differential cross section measurements of single top quark production in association with a Z boson in proton-proton collisions at √s = 13 TeV
title_sort Inclusive and differential cross section measurements of single top quark production in association with a Z boson in proton-proton collisions at √s = 13 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
Colisões proton-proton
Bosons Z
topic Aceleradores de partículas
Colisões proton-proton
Bosons Z
Hadron-Hadron scattering
Top Physics
dc.subject.eng.fl_str_mv Hadron-Hadron scattering
Top Physics
description Inclusive and differential cross sections of single top quark production in as sociation with a Z boson are measured in proton-proton collisions at a center-of-mass energy of 13 TeV with a data sample corresponding to an integrated luminosity of 138 fb−1 recorded by the CMS experiment. Events are selected based on the presence of three lep tons, electrons or muons, associated with leptonic Z boson and top quark decays. The measurement yields an inclusive cross section of 87.9 +7.5 −7.3 (stat)+7.3 −6.0 (syst) fb for a dilepton invariant mass greater than 30 GeV, in agreement with standard model (SM) calculations and represents the most precise determination to date. The ratio between the cross sec tions for the top quark and the top antiquark production in association with a Z boson is measured as 2.37+0.56 −0.42 (stat)+0.27 −0.13 (syst). Differential measurements at parton and particle levels are performed for the first time. Several kinematic observables are considered to study the modeling of the process. Results are compared to theoretical predictions with different assumptions on the source of the initial-state b quark and found to be in agree ment, within the uncertainties. Additionally, the spin asymmetry, which is sensitive to the top quark polarization, is determined from the differential distribution of the polarization angle at parton level to be 0.54±0.16 (stat)±0.06 (syst), in agreement with SM predictions.
publishDate 2022
dc.date.accessioned.fl_str_mv 2022-04-13T04:51:17Z
dc.date.issued.fl_str_mv 2022
dc.type.driver.fl_str_mv Estrangeiro
info:eu-repo/semantics/article
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dc.identifier.issn.pt_BR.fl_str_mv 1029-8479
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url http://hdl.handle.net/10183/237127
dc.language.iso.fl_str_mv eng
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dc.relation.ispartof.pt_BR.fl_str_mv The journal of high energy physics. Trieste. No. 2 (Feb. 2022), 107, 66 p.
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