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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) Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB)) |
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