Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/133354
Title: Measurement of the Λ0b, Ξ−b, and Ω−b Baryon Masses
Author: Abellan Beteta, Carlos
Calvo Gómez, Míriam
Camboni, Alessandro
Comerma Montells, Albert
Domingo Bonal, Francesc
Garrido Beltrán, Lluís
Graciani Díaz, Ricardo
Graugés Pous, Eugeni
López Asamar, Elias
Pérez-Calero Yzquierdo, Antonio
Picatoste Olloqui, Eduardo
Potterat, Cédric
Rives Molina, Vicente José
Ruiz, Hugo (Ruiz Pérez)
Vázquez Gómez, Ricard
Vilasis-Cardona, Xavier
LHCb Collaboration
Keywords: Física de partícules
Experiments
Particle physics
Experiments
Issue Date: 2-May-2013
Publisher: American Physical Society
Abstract: Bottom baryons decaying to a J / ψ meson and a hyperon are reconstructed using 1.0     fb − 1 of data collected in 2011 with the LHCb detector. Significant Λ 0 b → J / ψ Λ , Ξ − b → J / ψ Ξ − and Ω − b → J / ψ Ω − signals are observed and the corresponding masses are measured to be M ( Λ 0 b ) = 5619.53 ± 0.13 ( stat . ) ± 0.45 ( syst . )     MeV / c 2 , M ( Ξ − b ) = 5795.8 ± 0.9 ( stat . ) ± 0.4 ( syst . )     MeV / c 2 , M ( Ω − b ) = 6046.0 ± 2.2 ( stat . ) ± 0.5 ( syst . )     MeV / c 2 , while the differences with respect to the Λ 0 b mass are M ( Ξ − b ) − M ( Λ 0 b ) = 176.2 ± 0.9 ( stat . ) ± 0.1 ( syst . )     MeV / c 2 , M ( Ω − b ) − M ( Λ 0 b ) = 426.4 ± 2.2 ( stat . ) ± 0.4 ( syst . )     MeV / c 2 . These are the most precise mass measurements of the Λ 0 b , Ξ − b and Ω − b baryons to date. Averaging the above Λ 0 b mass measurement with that published by LHCb using 35     pb − 1 of data collected in 2010 yields M ( Λ 0 b ) = 5619.44 ± 0.13 ( stat . ) ± 0.38 ( syst . )     MeV / c 2 .
Note: Reproducció del document publicat a: https://doi.org/10.1103/PhysRevLett.110.182001
It is part of: Physical Review Letters, 2013, vol. 110, num. 18, p. 182001
URI: http://hdl.handle.net/2445/133354
Related resource: https://doi.org/10.1103/PhysRevLett.110.182001
ISSN: 0031-9007
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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