W+ W− boson pair production in proton-proton collisions at √s=13 TeV
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Publication Date: | 2020 |
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Format: | Article |
Language: | eng |
Source: | Repositório Institucional da UFRGS |
Download full: | http://hdl.handle.net/10183/216891 |
Summary: | A measurement of the W+W− boson pair production cross section in proton-proton collisions at s=13 TeV is presented. The data used in this study are collected with the CMS detector at the CERN LHC and correspond to an integrated luminosity of 35.9 fb−1. The W+W− candidate events are selected by requiring two oppositely charged leptons (electrons or muons). Two methods for reducing background contributions are employed. In the first one, a sequence of requirements on kinematic quantities is applied allowing a measurement of the total production cross section, 117.6±6.8 pb, which agrees well with the theoretical prediction. Fiducial cross sections are also reported for events with zero or one jet, and the change in the zero-jet fiducial cross section with the jet transverse momentum threshold is measured. Normalized differential cross sections are reported within the fiducial region. A second method for suppressing background contributions employs two random forest classifiers. The analysis based on this method includes a measurement of the total production cross section and also a measurement of the normalized jet multiplicity distribution in W+W− events. Finally, a dilepton invariant mass distribution is used to probe for physics beyond the standard model in the context of an effective field theory, and constraints on the presence of dimension-6 operators are derived. |
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Sirunyan, A. M.Silveira, Gustavo Gil daCMS Collaboration2020-12-24T04:21:39Z20200556-2821http://hdl.handle.net/10183/216891001120319A measurement of the W+W− boson pair production cross section in proton-proton collisions at s=13 TeV is presented. The data used in this study are collected with the CMS detector at the CERN LHC and correspond to an integrated luminosity of 35.9 fb−1. The W+W− candidate events are selected by requiring two oppositely charged leptons (electrons or muons). Two methods for reducing background contributions are employed. In the first one, a sequence of requirements on kinematic quantities is applied allowing a measurement of the total production cross section, 117.6±6.8 pb, which agrees well with the theoretical prediction. Fiducial cross sections are also reported for events with zero or one jet, and the change in the zero-jet fiducial cross section with the jet transverse momentum threshold is measured. Normalized differential cross sections are reported within the fiducial region. A second method for suppressing background contributions employs two random forest classifiers. The analysis based on this method includes a measurement of the total production cross section and also a measurement of the normalized jet multiplicity distribution in W+W− events. Finally, a dilepton invariant mass distribution is used to probe for physics beyond the standard model in the context of an effective field theory, and constraints on the presence of dimension-6 operators are derived.application/pdfengPhysical Review. D, Particles and fields. Woodbury. Vol. 102, no. 9 (Nov. 2020), 092001, 30 p.Aceleradores de partículasColisões proton-protonBosons WW+ W− boson pair production 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:UFRGSTEXT001120319.pdf.txt001120319.pdf.txtExtracted Texttext/plain147012http://www.lume.ufrgs.br/bitstream/10183/216891/2/001120319.pdf.txta8db57e4f3d72a205030f9f37c9d2f1cMD52ORIGINAL001120319.pdfTexto completo (inglês)application/pdf1626909http://www.lume.ufrgs.br/bitstream/10183/216891/1/001120319.pdf238421da2e41c5a3ebf67b4b5c420c7eMD5110183/2168912023-07-22 03:41:36.125965oai:www.lume.ufrgs.br:10183/216891Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2023-07-22T06:41:36Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
W+ W− boson pair production in proton-proton collisions at √s=13 TeV |
title |
W+ W− boson pair production in proton-proton collisions at √s=13 TeV |
spellingShingle |
W+ W− boson pair production in proton-proton collisions at √s=13 TeV Sirunyan, A. M. Aceleradores de partículas Colisões proton-proton Bosons W |
title_short |
W+ W− boson pair production in proton-proton collisions at √s=13 TeV |
title_full |
W+ W− boson pair production in proton-proton collisions at √s=13 TeV |
title_fullStr |
W+ W− boson pair production in proton-proton collisions at √s=13 TeV |
title_full_unstemmed |
W+ W− boson pair production in proton-proton collisions at √s=13 TeV |
title_sort |
W+ W− boson pair production 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 |
Aceleradores de partículas Colisões proton-proton Bosons W |
topic |
Aceleradores de partículas Colisões proton-proton Bosons W |
description |
A measurement of the W+W− boson pair production cross section in proton-proton collisions at s=13 TeV is presented. The data used in this study are collected with the CMS detector at the CERN LHC and correspond to an integrated luminosity of 35.9 fb−1. The W+W− candidate events are selected by requiring two oppositely charged leptons (electrons or muons). Two methods for reducing background contributions are employed. In the first one, a sequence of requirements on kinematic quantities is applied allowing a measurement of the total production cross section, 117.6±6.8 pb, which agrees well with the theoretical prediction. Fiducial cross sections are also reported for events with zero or one jet, and the change in the zero-jet fiducial cross section with the jet transverse momentum threshold is measured. Normalized differential cross sections are reported within the fiducial region. A second method for suppressing background contributions employs two random forest classifiers. The analysis based on this method includes a measurement of the total production cross section and also a measurement of the normalized jet multiplicity distribution in W+W− events. Finally, a dilepton invariant mass distribution is used to probe for physics beyond the standard model in the context of an effective field theory, and constraints on the presence of dimension-6 operators are derived. |
publishDate |
2020 |
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2020-12-24T04:21:39Z |
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2020 |
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Estrangeiro info:eu-repo/semantics/article |
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001120319 |
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Physical Review. D, Particles and fields. Woodbury. Vol. 102, no. 9 (Nov. 2020), 092001, 30 p. |
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