Spectator effects in semileptonic decay of charmed baryons

Abstract

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.

Comments: 8 pages in LaTeX. Final journal version. To appear in Phys. Lett. B