Observation of a new baryon state in the Λb0π+π− mass spectrum
A new baryon state is observed in the Λ0bπ+π− mass spectrum with high significance using a data sample of pp collisions, collected with the LHCb detector at centre-of-mass energies s√ = 7, 8 and 13 TeV, corresponding to an integrated luminosity of 9 fb−1. The mass and natural width of the new state...
| Autores: | , , , , , , , , , , , , , , |
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| Formato: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2020 |
| País: | España |
| Recursos: | Universidad de Barcelona |
| Repositorio: | Dipòsit Digital de la UB |
| OAI Identifier: | oai:diposit.ub.edu:2445/185366 |
| Acesso em linha: | https://hdl.handle.net/2445/185366 |
| Access Level: | acceso abierto |
| Palavra-chave: | Hadrons Gran Col·lisionador d'Hadrons Física de partícules Experiments Large Hadron Collider (France and Switzerland) Particle physics |
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Observation of a new baryon state in the Λb0π+π− mass spectrumLHCb CollaborationAlfonso Albero, AlejandroCalvo Gómez, MíriamCamboni, AlessandroCoquereau, SamuelGarrido Beltrán, LluísGascón Fora, DavidGironella Gironell, PereGolobardes, E.Graciani Díaz, RicardoGraugés Pous, EugeniManera Escalero, R.Marin Benito, CarlaVázquez Gómez, RicardVilasis-Cardona, XavierHadronsGran Col·lisionador d'HadronsFísica de partículesExperimentsHadronsLarge Hadron Collider (France and Switzerland)Particle physicsExperimentsA new baryon state is observed in the Λ0bπ+π− mass spectrum with high significance using a data sample of pp collisions, collected with the LHCb detector at centre-of-mass energies s√ = 7, 8 and 13 TeV, corresponding to an integrated luminosity of 9 fb−1. The mass and natural width of the new state are measured to be m=6072.3±2.9±0.6±0.2 MeV,Γ=72±11±2 MeV, where the first uncertainty is statistical and the second systematic. The third uncertainty for the mass is due to imprecise knowledge of the Λ0b baryon mass. The new state is consistent with the first radial excitation of the Λ0b baryon, the Λb(2S)0 resonance. Updated measurements of the masses and the upper limits on the natural widths of the previously observed Λb(5912)0 and Λb(5920)0 states are also reported.Springer Verlag2020info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://hdl.handle.net/2445/185366Articles publicats en revistes (Física Quàntica i Astrofísica)reponame:Dipòsit Digital de la UBinstname:Universidad de BarcelonaInglésReproducció del document publicat a: https://doi.org/10.1007/JHEP06(2020)136Journal of High Energy Physics, 2020, num. 136https://doi.org/10.1007/JHEP06(2020)136cc-by (c) LHCb Collaboration et al., 2020https://creativecommons.org/licenses/by/4.0/info:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/1853662026-05-27T06:46:51Z |
| dc.title.none.fl_str_mv |
Observation of a new baryon state in the Λb0π+π− mass spectrum |
| title |
Observation of a new baryon state in the Λb0π+π− mass spectrum |
| spellingShingle |
Observation of a new baryon state in the Λb0π+π− mass spectrum LHCb Collaboration Hadrons Gran Col·lisionador d'Hadrons Física de partícules Experiments Hadrons Large Hadron Collider (France and Switzerland) Particle physics Experiments |
| title_short |
Observation of a new baryon state in the Λb0π+π− mass spectrum |
| title_full |
Observation of a new baryon state in the Λb0π+π− mass spectrum |
| title_fullStr |
Observation of a new baryon state in the Λb0π+π− mass spectrum |
| title_full_unstemmed |
Observation of a new baryon state in the Λb0π+π− mass spectrum |
| title_sort |
Observation of a new baryon state in the Λb0π+π− mass spectrum |
| 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 Golobardes, E. Graciani Díaz, Ricardo Graugés Pous, Eugeni Manera Escalero, R. Marin Benito, Carla Vázquez Gómez, Ricard Vilasis-Cardona, Xavier |
| 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 Golobardes, E. Graciani Díaz, Ricardo Graugés Pous, Eugeni Manera Escalero, R. Marin Benito, Carla Vázquez Gómez, Ricard Vilasis-Cardona, Xavier |
| author_role |
author |
| author2 |
Alfonso Albero, Alejandro Calvo Gómez, Míriam Camboni, Alessandro Coquereau, Samuel Garrido Beltrán, Lluís Gascón Fora, David Gironella Gironell, Pere Golobardes, E. Graciani Díaz, Ricardo Graugés Pous, Eugeni Manera Escalero, R. Marin Benito, Carla Vázquez Gómez, Ricard Vilasis-Cardona, Xavier |
| author2_role |
author author author author author author author author author author author author author author |
| dc.subject.none.fl_str_mv |
Hadrons Gran Col·lisionador d'Hadrons Física de partícules Experiments Hadrons Large Hadron Collider (France and Switzerland) Particle physics Experiments |
| topic |
Hadrons Gran Col·lisionador d'Hadrons Física de partícules Experiments Hadrons Large Hadron Collider (France and Switzerland) Particle physics Experiments |
| description |
A new baryon state is observed in the Λ0bπ+π− mass spectrum with high significance using a data sample of pp collisions, collected with the LHCb detector at centre-of-mass energies s√ = 7, 8 and 13 TeV, corresponding to an integrated luminosity of 9 fb−1. The mass and natural width of the new state are measured to be m=6072.3±2.9±0.6±0.2 MeV,Γ=72±11±2 MeV, where the first uncertainty is statistical and the second systematic. The third uncertainty for the mass is due to imprecise knowledge of the Λ0b baryon mass. The new state is consistent with the first radial excitation of the Λ0b baryon, the Λb(2S)0 resonance. Updated measurements of the masses and the upper limits on the natural widths of the previously observed Λb(5912)0 and Λb(5920)0 states are also reported. |
| publishDate |
2020 |
| dc.date.none.fl_str_mv |
2020 |
| 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/2445/185366 |
| url |
https://hdl.handle.net/2445/185366 |
| 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/10.1007/JHEP06(2020)136 Journal of High Energy Physics, 2020, num. 136 https://doi.org/10.1007/JHEP06(2020)136 |
| dc.rights.none.fl_str_mv |
cc-by (c) LHCb Collaboration et al., 2020 https://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/openAccess |
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cc-by (c) LHCb Collaboration et al., 2020 https://creativecommons.org/licenses/by/4.0/ |
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openAccess |
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application/pdf |
| dc.publisher.none.fl_str_mv |
Springer Verlag |
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Springer Verlag |
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Articles publicats en revistes (Física Quàntica i Astrofísica) reponame:Dipòsit Digital de la UB instname:Universidad de Barcelona |
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Universidad de Barcelona |
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Dipòsit Digital de la UB |
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Dipòsit Digital de la UB |
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