Rescattering mechanism of weak decays of double-charm baryons *

Abstract The doubly charmed baryon was recently observed by LHCb via the decay processes of \Xi_{cc}^{++}\to \Lambda_c^+ K^-\pi^+\pi^+ and \Xi_c^+\pi^+ . These discovery channels were successfully predicted in a framework which short-distance contributions are calculated under factorization hypothesis long-distance estimated using rescattering mechanism for final-state-interaction effects. In this paper, we illustrate above detail systematic studies on two-body baryonic decays {\cal{B}}_{cc}\to{\cal{B}}_{c}P involving baryons {\cal{B}}_{cc} = (\Xi_{cc}^{++} , \Xi_{cc}^+,\Omega_{cc}^+) singly {\cal{B}}_{c} ({\cal{B}}_{\bar{3}}, {\cal{B}}_{6}) light pseudoscalar mesons P (\pi,K,\eta_{1,8})