A full amplitude analysis of Λ0b → J/ψ p π− 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 → p π−, either the Pc(4380)+ and Pc(4450)+ → J/ψ p states, previously observed in Λ0b → J/ψ p K− decays, or the Zc(4200)− → J/ψ π− state, previously reported in B0 → J/ψ K+ 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 Λ0b → J/ψ p π− Decays. PHYSICAL REVIEW LETTERS, 117(8), 1-10 [10.1103/PhysRevLett.117.082003].

Evidence for Exotic Hadron Contributions to Λ0b → J/ψ p π− Decays

Capriotti, L.;CARBONE, ANGELO;FERRARI, FABIO;GALLI, DOMENICO;MUSSINI, MANUEL;PATRIGNANI, CLAUDIA;PERAZZINI, STEFANO;VAGNONI, VINCENZO MARIA;ZANGOLI, MARIA;ZUCCHELLI, STEFANO
2016

Abstract

A full amplitude analysis of Λ0b → J/ψ p π− 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 → p π−, either the Pc(4380)+ and Pc(4450)+ → J/ψ p states, previously observed in Λ0b → J/ψ p K− decays, or the Zc(4200)− → J/ψ π− state, previously reported in B0 → J/ψ K+ 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.
2016
Aaij, R., Abellán Beteta, C., Adeva, B., Adinolfi, M., Ajaltouni, Z., Akar, S., et al. (2016). Evidence for Exotic Hadron Contributions to Λ0b → J/ψ p π− Decays. PHYSICAL REVIEW LETTERS, 117(8), 1-10 [10.1103/PhysRevLett.117.082003].
Aaij, R.; Abellán Beteta, C.; Adeva, B.; Adinolfi, M.; Ajaltouni, Z.; Akar, S.; Albrecht, J.; Alessio, F.; Alexander, M.; Ali, S.; Alkhazov, G.; Alvar...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/560174
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