2ND-ORDER POWER CORRECTIONS IN THE HEAVY-QUARK EFFECTIVE THEORY .2. BARYON FORM-FACTORS

The analysis of 1/m(Q)2 corrections of the previous paper is extended to the semileptonic decays of heavy baryons. We focus on the simplest case, the ground state LAMBDA(Q) baryons, in which the light degrees of freedom axe in a state of zero total angular momentum. The formalism, while identical in spirit, is considerably less cumbersome than for heavy mesons. The general results axe applied to the semileptonic decay LAMBA(b) --> LAMBDA(c)lnu. An estimate of the leading power corrections to the decay rate at zero recoil, which are of order 1/m(Q)2, is presented. It is pointed out that a measurement of certain asymmetry parameters would provide a direct measurement of 1/m(Q)2 corrections. Finally, it is shown how the analysis could be extended to include excited heavy baryons such as the SIGMA(Q) and the SIGMA(G)*.