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oai:recercat.cat:2445/1864072025-12-05T16:55:51Zcom_2072_1057col_2072_478823col_2072_478917

Study of the D 0 p amplitude in Λ b 0 → D 0 pπ - decays LHCb Collaboration Camboni, Alessandro Coquereau, Samuel Garrido Beltrán, Lluís Gascón Fora, David Graciani Díaz, Ricardo Graugés Pous, Eugeni Marin Benito, Carla Picatoste Olloqui, Eduardo Rives Molina, Vicente José Hadrons Gran Col·lisionador d'Hadrons Física de partícules Experiments Hadrons Large Hadron Collider (France and Switzerland) Particle physics Experiments 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. 2022-06-07T16:13:23Z 2022-06-07T16:13:23Z 2017-05 2022-06-07T16:13:23Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 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 cc-by (c) LHCb Collaboration et al., 2017 https://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/openAccess Springer Verlag Articles publicats en revistes (Física Quàntica i Astrofísica)