Observation of Excited Λ0b Baryons

Using p p collision data corresponding to 1.0     fb − 1 integrated luminosity collected by the LHCb detector, two narrow states are observed in the Λ 0 b π + π − spectrum with masses 5911.97 ± 0.12 ( stat ) ± 0.02 ( syst ) ± 0.66 ( Λ 0 b     mass )     MeV / c 2 and 5919.77 ± 0.08 ( stat ) ± 0.02 (...

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Detalhes bibliográficos
Autores: Abellan Beteta, Carlos, Calvo Gómez, Míriam, Camboni, Alessandro, Comerma Montells, Albert, Domingo Bonal, Francesc, Garrido Beltrán, Lluís, Gascón Fora, David, Grabalosa Gándara, Marc, Graciani Díaz, Ricardo, Graugés Pous, Eugeni, López Asamar, Elias, Pérez-Calero Yzquierdo, Antonio, Picatoste Olloqui, Eduardo, Pie Valls, B. (Blai), Potterat, Cédric, Puig Navarro, Albert, Roselló, M., Ruiz, Hugo (Ruiz Pérez), Vázquez Gómez, Ricard, Vilasis-Cardona, Xavier, LHCb Collaboration
Formato: artículo
Estado:Versión publicada
Fecha de publicación:2012
País:España
Recursos:Universidad de Barcelona
Repositorio:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/133583
Acesso em linha:https://hdl.handle.net/2445/133583
Access Level:acceso abierto
Palavra-chave:Física de partícules
Experiments
Particle physics
Descrição
Resumo:Using p p collision data corresponding to 1.0     fb − 1 integrated luminosity collected by the LHCb detector, two narrow states are observed in the Λ 0 b π + π − spectrum with masses 5911.97 ± 0.12 ( stat ) ± 0.02 ( syst ) ± 0.66 ( Λ 0 b     mass )     MeV / c 2 and 5919.77 ± 0.08 ( stat ) ± 0.02 ( syst ) ± 0.66 ( Λ 0 b     mass )     MeV / c 2 . The significances of the observations are 5.2 and 10.2 standard deviations, respectively. These states are interpreted as the orbitally excited Λ 0 b baryons, Λ * 0 b ( 5912 ) and Λ * 0 b ( 5920 ) .

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