The Lambda(b) lifetime in the light front quark model

The enhancement of the Lambda(b) decay width relative to B decay due to the difference in Fermi motion effects in Lambda(b) and B is calculated in the light front quark model with the simplifying assumption that Lambda(b) con sists of a heavy quark and a light scalar diquark. In order to explain the large deviation from unity in the experimental result for tau(Lambda(b))/ta u(B), it is necessary that the diquark be light and the ratio of the square s of the Lambda(b) and B wave functions at the origin be less than or simil ar to 1. (C) 2000 MAIK "Nauka/Interperiodica".