First Evidence for Direct CP Violation in Beauty to Charmonium Decays

The CP asymmetry and branching fraction of the Cabibbo-Kobayashi-Maskawa-suppressed decay B+→J/ψπ+ are precisely measured relative to the favored decay B+→J/ψK+ using a sample of proton-proton collision data corresponding to an integrated luminosity of 5.4 fb-1 recorded at a center-of-mass energy of...

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Detalles Bibliográficos
Autores: Golobardes Ribé, Elisabet, Vilasis-Cardona, Xavier, Calvo Gomez, Miriam, LHCb Collaboration - CERN
Tipo de recurso: artículo
Fecha de publicación:2024
País:España
Institución:Universitat Ramon Llull (URL)
Repositorio:DAU Arxiu Digital de la Universitat Ramon Llull
OAI Identifier:oai:dau.url.edu:20.500.14342/5819
Acceso en línea:http://hdl.handle.net/20.500.14342/5819
https://doi.org/10.1103/PhysRevLett.134.101801
Access Level:acceso abierto
Palabra clave:Cabibbo-Kobayashi-Maskawa matrix
Bottom mesons
charm quark
CP violation
Discrete symmetries
Hadron colliders
Gran col·lisionador d'hadrons (França i Suïssa)
53
530.1
539
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oai_identifier_str oai:dau.url.edu:20.500.14342/5819
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spelling First Evidence for Direct CP Violation in Beauty to Charmonium DecaysGolobardes Ribé, ElisabetVilasis-Cardona, XavierCalvo Gomez, MiriamLHCb Collaboration - CERNCabibbo-Kobayashi-Maskawa matrixBottom mesonscharm quarkCP violationDiscrete symmetriesHadron collidersGran col·lisionador d'hadrons (França i Suïssa)53530.1539The CP asymmetry and branching fraction of the Cabibbo-Kobayashi-Maskawa-suppressed decay B+→J/ψπ+ are precisely measured relative to the favored decay B+→J/ψK+ using a sample of proton-proton collision data corresponding to an integrated luminosity of 5.4 fb-1 recorded at a center-of-mass energy of 13 TeV during 2016-2018. The results of the CP asymmetry difference and branching fraction ratio are ΔACPACP(B+→J/ψπ+)-ACP(B+→J/ψK+)=(1.29±0.49±0.08)×10-2, Rπ/K[B(B+→J/ψπ+)/B(B+→J/ψK+)]=(3.852±0.022±0.018)×10-2, where the first uncertainties are statistical and the second are systematic. A combination with previous LHCb results based on data collected at 7 and 8 TeV in 2011 and 2012 yields ΔACP=(1.42±0.43±0.08)×10-2 and Rπ/K=(3.846±0.018±0.018)×10-2. The combined ΔACP value deviates from zero by 3.2 standard deviations, providing the first evidence for direct CP violation in the amplitudes of beauty decays to charmonium final states.info:eu-repo/semantics/publishedVersionAmerican Physical SocietyUniversitat Ramon Llull. La SalleCERN2026202620242025info:eu-repo/semantics/article13 p.application/pdfhttp://hdl.handle.net/20.500.14342/5819https://doi.org/10.1103/PhysRevLett.134.101801reponame:DAU Arxiu Digital de la Universitat Ramon Llullinstname:Universitat Ramon Llull (URL)InglésPhysical Review Letters. 2025. Vol. 134 - 101801© CERNAttribution 4.0 Internationalhttp://creativecommons.org/licenses/by/4.0/info:eu-repo/semantics/openAccessoai:dau.url.edu:20.500.14342/58192026-06-21T06:40:37Z
dc.title.none.fl_str_mv First Evidence for Direct CP Violation in Beauty to Charmonium Decays
title First Evidence for Direct CP Violation in Beauty to Charmonium Decays
spellingShingle First Evidence for Direct CP Violation in Beauty to Charmonium Decays
Golobardes Ribé, Elisabet
Cabibbo-Kobayashi-Maskawa matrix
Bottom mesons
charm quark
CP violation
Discrete symmetries
Hadron colliders
Gran col·lisionador d'hadrons (França i Suïssa)
53
530.1
539
title_short First Evidence for Direct CP Violation in Beauty to Charmonium Decays
title_full First Evidence for Direct CP Violation in Beauty to Charmonium Decays
title_fullStr First Evidence for Direct CP Violation in Beauty to Charmonium Decays
title_full_unstemmed First Evidence for Direct CP Violation in Beauty to Charmonium Decays
title_sort First Evidence for Direct CP Violation in Beauty to Charmonium Decays
dc.creator.none.fl_str_mv Golobardes Ribé, Elisabet
Vilasis-Cardona, Xavier
Calvo Gomez, Miriam
LHCb Collaboration - CERN
author Golobardes Ribé, Elisabet
author_facet Golobardes Ribé, Elisabet
Vilasis-Cardona, Xavier
Calvo Gomez, Miriam
LHCb Collaboration - CERN
author_role author
author2 Vilasis-Cardona, Xavier
Calvo Gomez, Miriam
LHCb Collaboration - CERN
author2_role author
author
author
dc.contributor.none.fl_str_mv Universitat Ramon Llull. La Salle
CERN
dc.subject.none.fl_str_mv Cabibbo-Kobayashi-Maskawa matrix
Bottom mesons
charm quark
CP violation
Discrete symmetries
Hadron colliders
Gran col·lisionador d'hadrons (França i Suïssa)
53
530.1
539
topic Cabibbo-Kobayashi-Maskawa matrix
Bottom mesons
charm quark
CP violation
Discrete symmetries
Hadron colliders
Gran col·lisionador d'hadrons (França i Suïssa)
53
530.1
539
description The CP asymmetry and branching fraction of the Cabibbo-Kobayashi-Maskawa-suppressed decay B+→J/ψπ+ are precisely measured relative to the favored decay B+→J/ψK+ using a sample of proton-proton collision data corresponding to an integrated luminosity of 5.4 fb-1 recorded at a center-of-mass energy of 13 TeV during 2016-2018. The results of the CP asymmetry difference and branching fraction ratio are ΔACPACP(B+→J/ψπ+)-ACP(B+→J/ψK+)=(1.29±0.49±0.08)×10-2, Rπ/K[B(B+→J/ψπ+)/B(B+→J/ψK+)]=(3.852±0.022±0.018)×10-2, where the first uncertainties are statistical and the second are systematic. A combination with previous LHCb results based on data collected at 7 and 8 TeV in 2011 and 2012 yields ΔACP=(1.42±0.43±0.08)×10-2 and Rπ/K=(3.846±0.018±0.018)×10-2. The combined ΔACP value deviates from zero by 3.2 standard deviations, providing the first evidence for direct CP violation in the amplitudes of beauty decays to charmonium final states.
publishDate 2024
dc.date.none.fl_str_mv 2024
2025
2026
2026
dc.type.none.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/20.500.14342/5819
https://doi.org/10.1103/PhysRevLett.134.101801
url http://hdl.handle.net/20.500.14342/5819
https://doi.org/10.1103/PhysRevLett.134.101801
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Physical Review Letters. 2025. Vol. 134 - 101801
dc.rights.none.fl_str_mv © CERN
Attribution 4.0 International
http://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv © CERN
Attribution 4.0 International
http://creativecommons.org/licenses/by/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 13 p.
application/pdf
dc.publisher.none.fl_str_mv American Physical Society
publisher.none.fl_str_mv American Physical Society
dc.source.none.fl_str_mv reponame:DAU Arxiu Digital de la Universitat Ramon Llull
instname:Universitat Ramon Llull (URL)
instname_str Universitat Ramon Llull (URL)
reponame_str DAU Arxiu Digital de la Universitat Ramon Llull
collection DAU Arxiu Digital de la Universitat Ramon Llull
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,812429

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