A full amplitude analysis of Λb0→J/ψpπ- decays is performed with a data sample acquired with the LHCb detector from 7 and 8 TeV pp collisions, corresponding to an integrated luminosity of 3 fb-1. A significantly better description of the data is achieved when, in addition to the previously observed nucleon excitations N→pπ-, either the Pc(4380)+ and Pc(4450)+→J/ψp states, previously observed in Λb0→J/ψpK- decays, or the Zc(4200)-→J/ψπ- state, previously reported in B0→J/ψK+π- decays, or all three, are included in the amplitude models. The data support a model containing all three exotic states, with a significance of more than three standard deviations. Within uncertainties, the data are consistent with the Pc(4380)+ and Pc(4450)+ production rates expected from their previous observation taking account of Cabibbo suppression.

Aaij, R., Abellán Beteta, C., Adeva, B., Adinolfi, M., Ajaltouni, Z., Akar, S., et al. (2016). Evidence for Exotic Hadron Contributions to Λb0 →j /ψpπ- Decays. PHYSICAL REVIEW LETTERS, 117(8), 082003 [10.1103/PhysRevLett.117.082003].

Evidence for Exotic Hadron Contributions to Λb0 →j /ψpπ- Decays

BELLOLI, NICOLETTA;Borsato, M;CALVI, MARTA;CARNITI, PAOLO;CASSINA, LORENZO;GOTTI, CLAUDIO;GRILLO, LUCIA;Martinelli, M;MATTEUZZI, CLARA;Petruzzo, M;
2016

Abstract

A full amplitude analysis of Λb0→J/ψpπ- decays is performed with a data sample acquired with the LHCb detector from 7 and 8 TeV pp collisions, corresponding to an integrated luminosity of 3 fb-1. A significantly better description of the data is achieved when, in addition to the previously observed nucleon excitations N→pπ-, either the Pc(4380)+ and Pc(4450)+→J/ψp states, previously observed in Λb0→J/ψpK- decays, or the Zc(4200)-→J/ψπ- state, previously reported in B0→J/ψK+π- decays, or all three, are included in the amplitude models. The data support a model containing all three exotic states, with a significance of more than three standard deviations. Within uncertainties, the data are consistent with the Pc(4380)+ and Pc(4450)+ production rates expected from their previous observation taking account of Cabibbo suppression.
Articolo in rivista - Articolo scientifico
Physics and Astronomy (all)
English
2016
117
8
082003
082003
none
Aaij, R., Abellán Beteta, C., Adeva, B., Adinolfi, M., Ajaltouni, Z., Akar, S., et al. (2016). Evidence for Exotic Hadron Contributions to Λb0 →j /ψpπ- Decays. PHYSICAL REVIEW LETTERS, 117(8), 082003 [10.1103/PhysRevLett.117.082003].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/154241
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