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Interpretation of the LHCb Pc(4312)+ Signal

C. Fernández-Ramírez, A. Pilloni, M. Albaladejo, A. Jackura, V. Mathieu, M. Mikhasenko, J.A. Silva-Castro, A.P. Szczepaniak
We study the nature of the new signal reported by LHCb in the J/psi p spectrum. Based on the S-matrix principles, we perform a minimum-bias analysis of the underlying reaction amplitude, focusing on the analytic properties that can be related to the microscopic origin of the Pc(4312)+ peak. By exploring several amplitude parametrizations, we find evidence for the attractive effect of the Sigma_c D0bar channel, which is not strong enough, however, to form a bound state.
Date of publication: 
Published in: 
Phys.Rev.Lett. 123 (2019) no.9, 092001