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
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/10183/237127 |
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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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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http://hdl.handle.net/10183/237127 |
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001138424 |
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http://hdl.handle.net/10183/237127 |
dc.language.iso.fl_str_mv |
eng |
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eng |
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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info:eu-repo/semantics/openAccess |
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openAccess |
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