Spectator effects in semileptonic decay of charmed baryons
  It is shown that the absolute rate of the semileptonic decays of the $\Xi_c$ baryons can be as much as two times higher than the semileptonic decay rate of $\Lambda_c$ due to the Pauli interference of the strange quark. This interference effect is still larger in the semileptonic decay rate of $\Omega_c$. An experimental measurement of the difference of these rates would thus provide an important piece of information on the spectator effects in decays of hadrons containing a heavy quark. 
M.B. Voloshin