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http://hdl.handle.net/2445/162071
Title: | Observation of New Resonances in the Λb0 π+π- System |
Author: | LHCb Collaboration Calvo Gómez, Míriam Camboni, Alessandro Coquereau, Samuel Garrido Beltrán, Lluís Gascón Fora, David Gironella Gironell, Pere Graciani Díaz, Ricardo Graugés Pous, Eugeni Manera Escalero, R. Vilasis-Cardona, Xavier Marin Benito, Carla |
Keywords: | Quarks Col·lisions (Física) Quarks Collisions (Physics) |
Issue Date: | 11-Oct-2019 |
Publisher: | American Physical Society |
Abstract: | We report the observation of a new structure in the Λ0 bπþπ− spectrum using the full LHCb data set of pp collisions, corresponding to an integrated luminosity of 9 fb−1, collected at ffiffi s p ¼ 7, 8, and 13 TeV. A study of the structure suggests its interpretation as a superposition of two almost degenerate narrow states. The masses and widths of these states are measured to be mΛbð6146Þ0 ¼ 6146.17 0.33 0.22 0.16 MeV; mΛbð6152Þ0 ¼ 6152.51 0.26 0.22 0.16 MeV; ΓΛbð6146Þ0 ¼ 2.9 1.3 0.3 MeV; ΓΛbð6152Þ0 ¼ 2.1 0.8 0.3 MeV;with a mass splitting of Δm ¼ 6.34 0.32 0.02 MeV, where the first uncertainty is statistical, the second systematic. The third uncertainty for the mass measurements derives from the knowledge of the mass of the Λ0 b baryon. The measured masses and widths of these new excited states suggest their possible interpretation as a doublet of Λbð1DÞ0 states. |
Note: | Reproducció del document publicat a: https://doi.org/10.1103/PhysRevLett.123.152001 |
It is part of: | Physical Review Letters, 2019, vol. 123, p. 152001 |
URI: | http://hdl.handle.net/2445/162071 |
Related resource: | https://doi.org/10.1103/PhysRevLett.123.152001 |
ISSN: | 0031-9007 |
Appears in Collections: | Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB)) Articles publicats en revistes (Física Quàntica i Astrofísica) |
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