Lifetimes of doubly charmed baryons: Xi(+)(cc) and Xi(++)(cc) - art. no. 014007

We perform a detailed investigation of total lifetimes for the Xi(cc)(++) a nd Xi(cc)(+) baryons in the framework of operator product expansion over th e inverse mass of the charmed quark, whereas, to estimate matrix elements o f operators obtained in operator product expansion, some approximations of nonrelativistic QCD are used. This approach allows one to take into account the corrections to the spectator decays of c quarks, which reflect the fac t that these quarks are bound as well as the contributions connected to the effects of both the Pauli interference for the Xi(cc)(++) baryon and the w eak scattering for the Xi(cc)(+) baryon. The realization of such a program leads to the following estimates for the total lifetimes of doubly charmed baryons: tau Xi(cc)(++) = 0.43+/-0.11 ps and tau(Xi cc)(+) = 0.11+/-0.03 ps . [S0556-2821(99)06309-2].