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Title: | Observation of a new baryon state in the Λb0π+π− mass spectrum |
Author: | 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 |
Keywords: | Hadrons Gran Col·lisionador d'Hadrons Física de partícules Experiments Hadrons Large Hadron Collider (France and Switzerland) Particle physics Experiments |
Issue Date: | 23-Jun-2020 |
Publisher: | Springer Verlag |
Abstract: | 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. |
Note: | Reproducció del document publicat a: https://doi.org/10.1007/JHEP06(2020)136 |
It is part of: | Journal of High Energy Physics, 2020, num. 136 |
URI: | https://hdl.handle.net/2445/185366 |
Related resource: | https://doi.org/10.1007/JHEP06(2020)136 |
ISSN: | 1126-6708 |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) |
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