Semileptonic decays of doubly charmed baryons in the bag model

We study the semileptonic decays of B-cc -> Bcl(+) nu e with the bag model, where l = (e. mu), B-cc = (Xi(++)(cc), Xi(+)(cc), Omega(+)(cc)), and B-c are the singly charmed baryons with J(P) = 1/2(+) . We obtain the decay widths of Gamma(Xi(++)(cc) -> Xi(+)(c)nu(e), Xi c'(+)e(+)nu(e), Lambda(+)e(+)nu(e), Omega(+)(c)e(+)nu(e)) = (5.1 +/- 0.1, 11 +/- 1,0.34 +/- 0.06, 0.76 +/- 0.06) x 10(-14) GeV, Gamma(Xi(+)(cc) -> Xi(0)(c)e(+)nu(e,) Xi c'(0)e(+)nu(e), Sigma(0)(c)e(+)nu(e)) = (5.1 +/- 0.6, 11 +/- 1, 1.5 +/- 0.1) x 10(-14) GeV, and Gamma(Omega(+)(cc) ->Omega(0)(c)e(+)nu(e), Xi(0)(c)e(+)nu(e,) Xi c'(0)e(+)nu(e)) = (22 +/- 2, 0.32 +/- 0.04, 0.77 +/- 0.06) x 10-14 Gev.We also get that Gamma(B-cc -> B-c mu(+)nu mu)/Gamma(B-cc -> B(c)e(+)nu(e)) = 0.97-1.00. In addition, we discuss the SUo3 thorn flavor breaking effects, classified into three aspects: phase space differences, spectator quarks, and overlappings of the transited quarks. In particular, we show that the breaking effects are dominated by the phase space differences, which can be as large as 25%. Explicitly, we find that Xi(++)(cc) -> Lambda(+)e(+)nu(e))V-cs(2)/Gamma( Xi(++)(cc) -> Xi(+)(c)e(+)nu(e))V-cd(2), which is expected as 1 under the exact SU(3) flavor symmetry.