Lambda(b) and Lambda(c) baryon decays at finite values of heavy quark masses

Semileptonic decays of Lambda(b) and Lambda(c) baryons are studied within t he relativistic three-quark model using finite values of heavy quark masses . Employing the same parameters as have been used previously for the descri ption of exclusive decays of heavy baryons in the heavy quark limit we calc ulate the six form factors of the process and the corresponding decay rates . Our calculation shows that the "finite mass" corrections are important in heavy-to-light transitions and are not negligible in heavy-to-heavy transi tions. (C) 2000 Published by Elsevier Science B.V. All rights reserved.