Measurement of the top quark polarization andt tt spin correlations using dilepton final states in proton-proton collisions at√s = 13 TeV
Autor(a) principal: | |
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Data de Publicação: | 2019 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/203802 |
Resumo: | Measurements of the top quark polarization and top quark pair (t ̄t) spin correlations are presented usingevents containing two oppositely charged leptons (e+e−, e+- μ∓, or μ+μ−) produced in proton-protoncollisions at a center-of-mass energy of 13 TeV. The data were recorded by the CMS experiment at the LHCin 2016 and correspond to an integrated luminosity of 35.9 fb−¹. A set of parton-level normalized differential cross sections, sensitive to each of the independent coefficients of the spin-dependent parts of the t ̄t production density matrix, is measured for the first time at 13 TeV. The measured distributions and extracted coefficients are compared with standard model predictions from simulations at next-to-leading-order (NLO) accuracy in quantum chromodynamics (QCD), and from NLO QCD calculations including electroweak corrections. All measurements are found to be consistent with the expectations of the standard model. The normalized differential cross sections are used in fits to constrain the anomalous chromo-magnetic and chromoelectric dipole moments of the top quark to−0.24<CtG=Λ2<0.07TeV−2and−0.33<CItG=Λ2<0.20TeV−2, respectively, at the 95% confidence level. |
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Sirunyan, A. M.Silveira, Gustavo Gil daCMS Collaboration2019-12-27T04:03:09Z20192470-0010http://hdl.handle.net/10183/203802001106217Measurements of the top quark polarization and top quark pair (t ̄t) spin correlations are presented usingevents containing two oppositely charged leptons (e+e−, e+- μ∓, or μ+μ−) produced in proton-protoncollisions at a center-of-mass energy of 13 TeV. The data were recorded by the CMS experiment at the LHCin 2016 and correspond to an integrated luminosity of 35.9 fb−¹. A set of parton-level normalized differential cross sections, sensitive to each of the independent coefficients of the spin-dependent parts of the t ̄t production density matrix, is measured for the first time at 13 TeV. The measured distributions and extracted coefficients are compared with standard model predictions from simulations at next-to-leading-order (NLO) accuracy in quantum chromodynamics (QCD), and from NLO QCD calculations including electroweak corrections. All measurements are found to be consistent with the expectations of the standard model. The normalized differential cross sections are used in fits to constrain the anomalous chromo-magnetic and chromoelectric dipole moments of the top quark to−0.24<CtG=Λ2<0.07TeV−2and−0.33<CItG=Λ2<0.20TeV−2, respectively, at the 95% confidence level.application/pdfengPhysical review. D, Particles, fields, gravitation, and cosmology. College Park. Vol. 100, no. 7 (Oct. 2019), 072002, 39 p.QuarksAceleradores de partículasMeasurement of the top quark polarization andt tt spin correlations using dilepton final states 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:UFRGSTEXT001106217.pdf.txt001106217.pdf.txtExtracted Texttext/plain173495http://www.lume.ufrgs.br/bitstream/10183/203802/2/001106217.pdf.txtc0ebc0122165ce10bdfe0522957c2074MD52ORIGINAL001106217.pdfTexto completo (inglês)application/pdf1845521http://www.lume.ufrgs.br/bitstream/10183/203802/1/001106217.pdf9234d324628c38575707923173661ed8MD5110183/2038022023-08-05 03:38:23.463139oai:www.lume.ufrgs.br:10183/203802Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2023-08-05T06:38:23Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Measurement of the top quark polarization andt tt spin correlations using dilepton final states in proton-proton collisions at√s = 13 TeV |
title |
Measurement of the top quark polarization andt tt spin correlations using dilepton final states in proton-proton collisions at√s = 13 TeV |
spellingShingle |
Measurement of the top quark polarization andt tt spin correlations using dilepton final states in proton-proton collisions at√s = 13 TeV Sirunyan, A. M. Quarks Aceleradores de partículas |
title_short |
Measurement of the top quark polarization andt tt spin correlations using dilepton final states in proton-proton collisions at√s = 13 TeV |
title_full |
Measurement of the top quark polarization andt tt spin correlations using dilepton final states in proton-proton collisions at√s = 13 TeV |
title_fullStr |
Measurement of the top quark polarization andt tt spin correlations using dilepton final states in proton-proton collisions at√s = 13 TeV |
title_full_unstemmed |
Measurement of the top quark polarization andt tt spin correlations using dilepton final states in proton-proton collisions at√s = 13 TeV |
title_sort |
Measurement of the top quark polarization andt tt spin correlations using dilepton final states in proton-proton collisions at√s = 13 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 |
Quarks Aceleradores de partículas |
topic |
Quarks Aceleradores de partículas |
description |
Measurements of the top quark polarization and top quark pair (t ̄t) spin correlations are presented usingevents containing two oppositely charged leptons (e+e−, e+- μ∓, or μ+μ−) produced in proton-protoncollisions at a center-of-mass energy of 13 TeV. The data were recorded by the CMS experiment at the LHCin 2016 and correspond to an integrated luminosity of 35.9 fb−¹. A set of parton-level normalized differential cross sections, sensitive to each of the independent coefficients of the spin-dependent parts of the t ̄t production density matrix, is measured for the first time at 13 TeV. The measured distributions and extracted coefficients are compared with standard model predictions from simulations at next-to-leading-order (NLO) accuracy in quantum chromodynamics (QCD), and from NLO QCD calculations including electroweak corrections. All measurements are found to be consistent with the expectations of the standard model. The normalized differential cross sections are used in fits to constrain the anomalous chromo-magnetic and chromoelectric dipole moments of the top quark to−0.24<CtG=Λ2<0.07TeV−2and−0.33<CItG=Λ2<0.20TeV−2, respectively, at the 95% confidence level. |
publishDate |
2019 |
dc.date.accessioned.fl_str_mv |
2019-12-27T04:03:09Z |
dc.date.issued.fl_str_mv |
2019 |
dc.type.driver.fl_str_mv |
Estrangeiro info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10183/203802 |
dc.identifier.issn.pt_BR.fl_str_mv |
2470-0010 |
dc.identifier.nrb.pt_BR.fl_str_mv |
001106217 |
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url |
http://hdl.handle.net/10183/203802 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Physical review. D, Particles, fields, gravitation, and cosmology. College Park. Vol. 100, no. 7 (Oct. 2019), 072002, 39 p. |
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info:eu-repo/semantics/openAccess |
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openAccess |
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application/pdf |
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