Precision measurement of the Λc+, Ξc+, and Ξc0 baryon lifetimes

We report measurements of the lifetimes of the Λþc , Ξþc and Ξ0 c charm baryons using proton-proton collision data at center-of-mass energies of 7 and 8 TeV, corresponding to an integrated luminosity of 3.0 fb−1, collected by the LHCb experiment. The charm baryons are reconstructed through the decay...

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Authors: LHCb Collaboration, Alfonso Albero, Alejandro, Calvo Gómez, Míriam, Camboni, Alessandro, Coquereau, Samuel, Garrido Beltrán, Lluís, Gascón Fora, David, Gironella Gironell, Pere, Graciani Díaz, Ricardo, Graugés Pous, Eugeni, Vilasis-Cardona, Xavier, Marin Benito, Carla
Format: article
Status:Published version
Publication Date:2019
Country:España
Institution:Universidad de Barcelona
Repository:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/162291
Online Access:https://hdl.handle.net/2445/162291
Access Level:Open access
Keyword:Barions
Col·lisions (Astrofísica)
Baryons
Collisions (Astrophysics)
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spelling Precision measurement of the Λc+, Ξc+, and Ξc0 baryon lifetimesLHCb CollaborationAlfonso Albero, AlejandroCalvo Gómez, MíriamCamboni, AlessandroCoquereau, SamuelGarrido Beltrán, LluísGascón Fora, DavidGironella Gironell, PereGraciani Díaz, RicardoGraugés Pous, EugeniVilasis-Cardona, XavierMarin Benito, CarlaBarionsCol·lisions (Astrofísica)BaryonsCollisions (Astrophysics)We report measurements of the lifetimes of the Λþc , Ξþc and Ξ0 c charm baryons using proton-proton collision data at center-of-mass energies of 7 and 8 TeV, corresponding to an integrated luminosity of 3.0 fb−1, collected by the LHCb experiment. The charm baryons are reconstructed through the decays Λþc → pK−πþ, Ξþc → pK−πþ and Ξ0c → pK−K−πþ, and originate from semimuonic decays of beauty baryons. The lifetimes are measured relative to that of the Dþ meson, and are determinedto be τΛþc ¼ 203.51.01.31.4 fs; τΞþc ¼ 456.83.52.93.1 fs; τΞ0 c ¼ 154.51.71.61.0 fs; where the uncertainties are statistical, systematic, and due to the uncertainty in the Dþ lifetime. The measurements are approximately 3-4 times more precise than the current world average values. The Λþc and Ξþ c lifetimes are in agreement with previous measurements; however, the Ξ0 c baryon lifetime is approximately 3.3 standard deviations larger than the world average value.American Physical Society2019info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://hdl.handle.net/2445/162291Articles publicats en revistes (Física Quàntica i Astrofísica)reponame:Dipòsit Digital de la UBinstname:Universidad de BarcelonaInglésReproducció del document publicat a: https://doi.org/10.1103/PhysRevD.100.032001Physical Review D, 2019, num. 100, p. 032001https://doi.org/10.1103/PhysRevD.100.032001info:eu-repo/grantAgreement/EC/H2020/792684(c) American Physical Society, 2019info:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/1622912026-05-27T06:46:51Z
dc.title.none.fl_str_mv Precision measurement of the Λc+, Ξc+, and Ξc0 baryon lifetimes
title Precision measurement of the Λc+, Ξc+, and Ξc0 baryon lifetimes
spellingShingle Precision measurement of the Λc+, Ξc+, and Ξc0 baryon lifetimes
LHCb Collaboration
Barions
Col·lisions (Astrofísica)
Baryons
Collisions (Astrophysics)
title_short Precision measurement of the Λc+, Ξc+, and Ξc0 baryon lifetimes
title_full Precision measurement of the Λc+, Ξc+, and Ξc0 baryon lifetimes
title_fullStr Precision measurement of the Λc+, Ξc+, and Ξc0 baryon lifetimes
title_full_unstemmed Precision measurement of the Λc+, Ξc+, and Ξc0 baryon lifetimes
title_sort Precision measurement of the Λc+, Ξc+, and Ξc0 baryon lifetimes
dc.creator.none.fl_str_mv LHCb Collaboration
Alfonso Albero, Alejandro
Calvo Gómez, Míriam
Camboni, Alessandro
Coquereau, Samuel
Garrido Beltrán, Lluís
Gascón Fora, David
Gironella Gironell, Pere
Graciani Díaz, Ricardo
Graugés Pous, Eugeni
Vilasis-Cardona, Xavier
Marin Benito, Carla
author LHCb Collaboration
author_facet LHCb Collaboration
Alfonso Albero, Alejandro
Calvo Gómez, Míriam
Camboni, Alessandro
Coquereau, Samuel
Garrido Beltrán, Lluís
Gascón Fora, David
Gironella Gironell, Pere
Graciani Díaz, Ricardo
Graugés Pous, Eugeni
Vilasis-Cardona, Xavier
Marin Benito, Carla
author_role author
author2 Alfonso Albero, Alejandro
Calvo Gómez, Míriam
Camboni, Alessandro
Coquereau, Samuel
Garrido Beltrán, Lluís
Gascón Fora, David
Gironella Gironell, Pere
Graciani Díaz, Ricardo
Graugés Pous, Eugeni
Vilasis-Cardona, Xavier
Marin Benito, Carla
author2_role author
author
author
author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Barions
Col·lisions (Astrofísica)
Baryons
Collisions (Astrophysics)
topic Barions
Col·lisions (Astrofísica)
Baryons
Collisions (Astrophysics)
description We report measurements of the lifetimes of the Λþc , Ξþc and Ξ0 c charm baryons using proton-proton collision data at center-of-mass energies of 7 and 8 TeV, corresponding to an integrated luminosity of 3.0 fb−1, collected by the LHCb experiment. The charm baryons are reconstructed through the decays Λþc → pK−πþ, Ξþc → pK−πþ and Ξ0c → pK−K−πþ, and originate from semimuonic decays of beauty baryons. The lifetimes are measured relative to that of the Dþ meson, and are determinedto be τΛþc ¼ 203.51.01.31.4 fs; τΞþc ¼ 456.83.52.93.1 fs; τΞ0 c ¼ 154.51.71.61.0 fs; where the uncertainties are statistical, systematic, and due to the uncertainty in the Dþ lifetime. The measurements are approximately 3-4 times more precise than the current world average values. The Λþc and Ξþ c lifetimes are in agreement with previous measurements; however, the Ξ0 c baryon lifetime is approximately 3.3 standard deviations larger than the world average value.
publishDate 2019
dc.date.none.fl_str_mv 2019
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/162291
url https://hdl.handle.net/2445/162291
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Reproducció del document publicat a: https://doi.org/10.1103/PhysRevD.100.032001
Physical Review D, 2019, num. 100, p. 032001
https://doi.org/10.1103/PhysRevD.100.032001
info:eu-repo/grantAgreement/EC/H2020/792684
dc.rights.none.fl_str_mv (c) American Physical Society, 2019
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) American Physical Society, 2019
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 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 Articles publicats en revistes (Física Quàntica i Astrofísica)
reponame:Dipòsit Digital de la UB
instname:Universidad de Barcelona
instname_str Universidad de Barcelona
reponame_str Dipòsit Digital de la UB
collection Dipòsit Digital de la UB
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,300724

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