Observation of tt¯ Production in Pb+Pb Collisions at √sNN=5.02 TeV with the ATLAS Detector

Autores
Alonso, Francisco; Beaucamp, Jean Yves; Dova, María Teresa; Monticelli, Fernando Gabriel; Sili, Francisco; Wahlberg, Hernán Pablo; The ATLAS Collaboration
Año de publicación
2025
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Top-quark pair production is observed in lead–lead (Pb+Pb) collisions at √sNN=5.02 TeV at the Large Hadron Collider with the ATLAS detector. The data sample was recorded in 2015 and 2018, amounting to an integrated luminosity of 1.9 nb−1. Events with exactly one electron and one muon and at least two jets are selected. Top-quark pair production is measured with an observed (expected) significance of 5.0 (4.1) standard deviations. The measured top-quark pair production cross section is σtt¯=3.6 −0.9+1.0(stat) −0.5+0.8(syst) μb, with a total relative uncertainty of 31%, and is consistent with theoretical predictions using a range of different nuclear parton distribution functions. The observation of this process consolidates the evidence of the existence of all quark flavors in the preequilibrium stage of the quark-gluon plasma at very high energy densities, similar to the conditions present in the early Universe.
La lista completa de autores que integran el documento puede consultarse en el archivo.
Instituto de Física La Plata
Materia
Física
Top-quark pair production
Lead–lead collisions
Quark–gluon plasma
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/195969
Acceder
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oai_identifier_str oai:sedici.unlp.edu.ar:10915/195969
network_acronym_str SEDICI
repository_id_str 1329
network_name_str SEDICI (UNLP)
spelling Observation of tt¯ Production in Pb+Pb Collisions at √sNN=5.02 TeV with the ATLAS DetectorAlonso, FranciscoBeaucamp, Jean YvesDova, María TeresaMonticelli, Fernando GabrielSili, FranciscoWahlberg, Hernán PabloThe ATLAS CollaborationFísicaTop-quark pair productionLead–lead collisionsQuark–gluon plasmaTop-quark pair production is observed in lead–lead (Pb+Pb) collisions at √sNN=5.02 TeV at the Large Hadron Collider with the ATLAS detector. The data sample was recorded in 2015 and 2018, amounting to an integrated luminosity of 1.9 nb−1. Events with exactly one electron and one muon and at least two jets are selected. Top-quark pair production is measured with an observed (expected) significance of 5.0 (4.1) standard deviations. The measured top-quark pair production cross section is σtt¯=3.6 −0.9+1.0(stat) −0.5+0.8(syst) μb, with a total relative uncertainty of 31%, and is consistent with theoretical predictions using a range of different nuclear parton distribution functions. The observation of this process consolidates the evidence of the existence of all quark flavors in the preequilibrium stage of the quark-gluon plasma at very high energy densities, similar to the conditions present in the early Universe.La lista completa de autores que integran el documento puede consultarse en el archivo.Instituto de Física La Plata2025info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfhttp://sedici.unlp.edu.ar/handle/10915/195969enginfo:eu-repo/semantics/altIdentifier/issn/1079-7114info:eu-repo/semantics/altIdentifier/doi/10.1103/PhysRevLett.134.142301info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by/4.0/Creative Commons Attribution 4.0 International (CC BY 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2026-06-23T11:17:12Zoai:sedici.unlp.edu.ar:10915/195969Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292026-06-23 11:17:12.919SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Observation of tt¯ Production in Pb+Pb Collisions at √sNN=5.02 TeV with the ATLAS Detector
title Observation of tt¯ Production in Pb+Pb Collisions at √sNN=5.02 TeV with the ATLAS Detector
spellingShingle Observation of tt¯ Production in Pb+Pb Collisions at √sNN=5.02 TeV with the ATLAS Detector
Alonso, Francisco
Física
Top-quark pair production
Lead–lead collisions
Quark–gluon plasma
title_short Observation of tt¯ Production in Pb+Pb Collisions at √sNN=5.02 TeV with the ATLAS Detector
title_full Observation of tt¯ Production in Pb+Pb Collisions at √sNN=5.02 TeV with the ATLAS Detector
title_fullStr Observation of tt¯ Production in Pb+Pb Collisions at √sNN=5.02 TeV with the ATLAS Detector
title_full_unstemmed Observation of tt¯ Production in Pb+Pb Collisions at √sNN=5.02 TeV with the ATLAS Detector
title_sort Observation of tt¯ Production in Pb+Pb Collisions at √sNN=5.02 TeV with the ATLAS Detector
dc.creator.none.fl_str_mv Alonso, Francisco
Beaucamp, Jean Yves
Dova, María Teresa
Monticelli, Fernando Gabriel
Sili, Francisco
Wahlberg, Hernán Pablo
The ATLAS Collaboration
author Alonso, Francisco
author_facet Alonso, Francisco
Beaucamp, Jean Yves
Dova, María Teresa
Monticelli, Fernando Gabriel
Sili, Francisco
Wahlberg, Hernán Pablo
The ATLAS Collaboration
author_role author
author2 Beaucamp, Jean Yves
Dova, María Teresa
Monticelli, Fernando Gabriel
Sili, Francisco
Wahlberg, Hernán Pablo
The ATLAS Collaboration
author2_role author
author
author
author
author
author
dc.subject.none.fl_str_mv Física
Top-quark pair production
Lead–lead collisions
Quark–gluon plasma
topic Física
Top-quark pair production
Lead–lead collisions
Quark–gluon plasma
dc.description.none.fl_txt_mv Top-quark pair production is observed in lead–lead (Pb+Pb) collisions at √sNN=5.02 TeV at the Large Hadron Collider with the ATLAS detector. The data sample was recorded in 2015 and 2018, amounting to an integrated luminosity of 1.9 nb−1. Events with exactly one electron and one muon and at least two jets are selected. Top-quark pair production is measured with an observed (expected) significance of 5.0 (4.1) standard deviations. The measured top-quark pair production cross section is σtt¯=3.6 −0.9+1.0(stat) −0.5+0.8(syst) μb, with a total relative uncertainty of 31%, and is consistent with theoretical predictions using a range of different nuclear parton distribution functions. The observation of this process consolidates the evidence of the existence of all quark flavors in the preequilibrium stage of the quark-gluon plasma at very high energy densities, similar to the conditions present in the early Universe.
La lista completa de autores que integran el documento puede consultarse en el archivo.
Instituto de Física La Plata
description Top-quark pair production is observed in lead–lead (Pb+Pb) collisions at √sNN=5.02 TeV at the Large Hadron Collider with the ATLAS detector. The data sample was recorded in 2015 and 2018, amounting to an integrated luminosity of 1.9 nb−1. Events with exactly one electron and one muon and at least two jets are selected. Top-quark pair production is measured with an observed (expected) significance of 5.0 (4.1) standard deviations. The measured top-quark pair production cross section is σtt¯=3.6 −0.9+1.0(stat) −0.5+0.8(syst) μb, with a total relative uncertainty of 31%, and is consistent with theoretical predictions using a range of different nuclear parton distribution functions. The observation of this process consolidates the evidence of the existence of all quark flavors in the preequilibrium stage of the quark-gluon plasma at very high energy densities, similar to the conditions present in the early Universe.
publishDate 2025
dc.date.none.fl_str_mv 2025
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Articulo
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://sedici.unlp.edu.ar/handle/10915/195969
url http://sedici.unlp.edu.ar/handle/10915/195969
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/issn/1079-7114
info:eu-repo/semantics/altIdentifier/doi/10.1103/PhysRevLett.134.142301
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by/4.0/
Creative Commons Attribution 4.0 International (CC BY 4.0)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by/4.0/
Creative Commons Attribution 4.0 International (CC BY 4.0)
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:SEDICI (UNLP)
instname:Universidad Nacional de La Plata
instacron:UNLP
reponame_str SEDICI (UNLP)
collection SEDICI (UNLP)
instname_str Universidad Nacional de La Plata
instacron_str UNLP
institution UNLP
repository.name.fl_str_mv SEDICI (UNLP) - Universidad Nacional de La Plata
repository.mail.fl_str_mv alira@sedici.unlp.edu.ar
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score 13.24418

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