First lattice study of semileptonic decays ofΛbandΞbbaryons

We present the results of the first lattice study of semileptonic decays of baryons containing a $b$ quark. Predictions for the decay distributions are given and the Isgur-Wise functions for heavy baryons are computed for values of the velocity transfer up to about $\omega =\mathrm{1.2.}\mathrm{}$ The computations are performed on a ${24}^3\times 48$ lattice at $\beta =6.2\mathrm{}$ using the Sheikholeslami-Wohlert action in the quenched approximation.