Observation of four top quark production in proton-proton collisions at √ = 13TeV

The observation of the production of four top quarks in proton-proton collisions is reported, based on a data sample collected by the CMS experiment at a center-of-mass energy of 13 TeV in 2016–2018 at the CERN LHC and corresponding to an integrated luminosity of 138 fb−1. Events with two same-sign,...

Descripción completa

Detalles Bibliográficos
Autores: Hayrapetyan, Aram, Silveira, Gustavo Gil da, Bernardes, César Augusto, CMS Collaboration
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2023
País:Brasil
Institución:Universidade Federal do Rio Grande do Sul (UFRGS)
Repositorio:Repositório Institucional da UFRGS
Idioma:inglés
OAI Identifier:oai:www.lume.ufrgs.br:10183/278511
Acceso en línea:http://hdl.handle.net/10183/278511
Access Level:acceso abierto
Palabra clave:Aceleradores de partículas
Colisões proton-proton
CMS
Top quark
id BR_23736d8a4fa88d8fb9008d5fa183cecb
oai_identifier_str oai:www.lume.ufrgs.br:10183/278511
network_acronym_str BR
network_name_str Brasil
repository_id_str
spelling 2024-09-06T06:39:18Z20230370-2693http://hdl.handle.net/10183/278511001200130The observation of the production of four top quarks in proton-proton collisions is reported, based on a data sample collected by the CMS experiment at a center-of-mass energy of 13 TeV in 2016–2018 at the CERN LHC and corresponding to an integrated luminosity of 138 fb−1. Events with two same-sign, three, or four charged leptons (electrons and muons) and additional jets are analyzed. Compared to previous results in these channels, updated identification techniques for charged leptons and jets originating from the hadronization of b quarks, as well as a revised multivariate analysis strategy to distinguish the signal process from the main backgrounds, lead to an improved expected signal significance of 4.9 standard deviations above the background-only hypothesis. Four top quark production is observed with a significance of 5.6 standard deviations, and its cross section is measured to be 17.7 +3.7 −3.5 (stat) +2.3 −1.9 (syst) fb, in agreement with the available standard model predictions.application/pdfengPhysics letters. B. Amsterdam. Vol. 847 (Dec. 2023), 138290, 32 p.Aceleradores de partículasColisões proton-protonCMSTop quarkObservation of four top quark production in proton-proton collisions at √ = 13TeVEstrangeiroinfo: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:UFRGSHayrapetyan, AramSilveira, Gustavo Gil daBernardes, César AugustoCMS CollaborationTEXT001200130.pdf.txt001200130.pdf.txtExtracted Texttext/plain145132http://www.lume.ufrgs.br/bitstream/10183/278511/2/001200130.pdf.txt19bf5f0d350beb6fa387f79bb65fd0ddMD52ORIGINAL001200130.pdfTexto completo (inglês)application/pdf2625607http://www.lume.ufrgs.br/bitstream/10183/278511/1/001200130.pdf8f69c625ff90132b464f5995d8236074MD5110183/2785112024-09-07 06:19:11.399713oai:www.lume.ufrgs.br:10183/278511Repositório InstitucionalPUBhttps://lume.ufrgs.br/oai/requestlume@ufrgs.bropendoar:2024-09-07T09:19:11Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false
dc.title.pt_BR.fl_str_mv Observation of four top quark production in proton-proton collisions at √ = 13TeV
title Observation of four top quark production in proton-proton collisions at √ = 13TeV
spellingShingle Observation of four top quark production in proton-proton collisions at √ = 13TeV
Hayrapetyan, Aram
Aceleradores de partículas
Colisões proton-proton
CMS
Top quark
title_short Observation of four top quark production in proton-proton collisions at √ = 13TeV
title_full Observation of four top quark production in proton-proton collisions at √ = 13TeV
title_fullStr Observation of four top quark production in proton-proton collisions at √ = 13TeV
title_full_unstemmed Observation of four top quark production in proton-proton collisions at √ = 13TeV
title_sort Observation of four top quark production in proton-proton collisions at √ = 13TeV
dc.creator.none.fl_str_mv Hayrapetyan, Aram
Silveira, Gustavo Gil da
Bernardes, César Augusto
CMS Collaboration
author Hayrapetyan, Aram
author_facet Hayrapetyan, Aram
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.subject.por.fl_str_mv Aceleradores de partículas
Colisões proton-proton
topic Aceleradores de partículas
Colisões proton-proton
CMS
Top quark
dc.subject.eng.fl_str_mv CMS
Top quark
description The observation of the production of four top quarks in proton-proton collisions is reported, based on a data sample collected by the CMS experiment at a center-of-mass energy of 13 TeV in 2016–2018 at the CERN LHC and corresponding to an integrated luminosity of 138 fb−1. Events with two same-sign, three, or four charged leptons (electrons and muons) and additional jets are analyzed. Compared to previous results in these channels, updated identification techniques for charged leptons and jets originating from the hadronization of b quarks, as well as a revised multivariate analysis strategy to distinguish the signal process from the main backgrounds, lead to an improved expected signal significance of 4.9 standard deviations above the background-only hypothesis. Four top quark production is observed with a significance of 5.6 standard deviations, and its cross section is measured to be 17.7 +3.7 −3.5 (stat) +2.3 −1.9 (syst) fb, in agreement with the available standard model predictions.
publishDate 2023
dc.date.issued.fl_str_mv 2023
dc.date.accessioned.fl_str_mv 2024-09-06T06:39:18Z
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/10183/278511
dc.identifier.issn.pt_BR.fl_str_mv 0370-2693
dc.identifier.nrb.pt_BR.fl_str_mv 001200130
identifier_str_mv 0370-2693
001200130
url http://hdl.handle.net/10183/278511
dc.language.iso.fl_str_mv eng
language eng
dc.relation.ispartof.pt_BR.fl_str_mv Physics letters. B. Amsterdam. Vol. 847 (Dec. 2023), 138290, 32 p.
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:Repositório Institucional da UFRGS
instname:Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS
instname_str Universidade Federal do Rio Grande do Sul (UFRGS)
instacron_str UFRGS
institution UFRGS
reponame_str Repositório Institucional da UFRGS
collection Repositório Institucional da UFRGS
bitstream.url.fl_str_mv http://www.lume.ufrgs.br/bitstream/10183/278511/2/001200130.pdf.txt
http://www.lume.ufrgs.br/bitstream/10183/278511/1/001200130.pdf
bitstream.checksum.fl_str_mv 19bf5f0d350beb6fa387f79bb65fd0dd
8f69c625ff90132b464f5995d8236074
bitstream.checksumAlgorithm.fl_str_mv MD5
MD5
repository.name.fl_str_mv Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)
repository.mail.fl_str_mv lume@ufrgs.br
_version_ 1853675940916232192
score 15,300724

Similares en LA Referencia