Rescattering mechanism of weak decays of double-charm baryons * *Supported by the National Natural Science Foundation of China (11775117, U1732101, 11975112), and National Key Research and Development Program of China (2020YFA0406400)

Abstract

The doubly charmed baryon was recently observed by LHCb via the decay processes of and . These discovery channels were successfully predicted in a framework in which the short-distance contributions are calculated under the factorization hypothesis and the long-distance contributions are estimated using the rescattering mechanism for the final-state-interaction effects. In this paper, we illustrate the above framework in detail by systematic studies on the two-body baryonic decays involving the doubly charmed baryons , the singly charmed baryons and the light pseudoscalar mesons .