Study of the D 0 p amplitude in Λ b 0 → D 0 pπ - decays

An amplitude analysis of the decay Λ b 0 → D 0 pπ - is performed in the part of the phase space containing resonances in the D 0 p channel. The study is based on a data sample corresponding to an integrated luminosity of 3.0 fb-1 of pp collisions recorded by the LHCb experiment. The spectrum of excited Λ c + states that decay into D 0 p is studied. The masses, widths and quantum numbers of the Λc(2880)+ and Λc(2940)+ resonances are measured. The constraints on the spin and parity for the Λc(2940)+ state are obtained for the first time. A near-threshold enhancement in the D 0 p amplitude is investigated and found to be consistent with a new resonance, denoted the Λc(2860)+, of spin 3 /2 and positive parity.

Document Type

Article

Published version

Language

English

Subjects and keywords

Hadrons; Gran Col·lisionador d'Hadrons; Física de partícules; Experiments; Hadrons; Large Hadron Collider (France and Switzerland); Particle physics; Experiments

Publisher

Springer Verlag

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Reproducció del document publicat a: https://doi.org/10.1007/JHEP05(2017)030

Journal of High Energy Physics, 2017, vol. 2017, num. 30, p. 1-43

https://doi.org/10.1007/JHEP05(2017)030

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Rights

cc-by (c) LHCb Collaboration et al., 2017

https://creativecommons.org/licenses/by/4.0/

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Física Quàntica i Astrofísica [2993]

ISGlobal - Institut de Salut Global de Barcelona [61308]