arXiv:hep-ph/0003325·v3·High Energy Physics — Phenomenology
The Lambda_b lifetime in the light front quark model
P.Yu.Kulikov · I.M.Narodetskii · A.I.Onischenko (Institute for Theoretical and Experimental Physics, Moscow)
Abstract
The enhancement of the Lambda_b decay width relative to B decay one due to the difference of Fermi motion effects in Lambda_b and B is calculated in the light--front quark model with the simplifying assumption that Lambda_b consists of the heavy quark and light scalar diquark. In order to explain the large deviation from unity in the experimental result for tau(Lambda_b)/tau(B), it is necessary that diquark be light and the ratio of the squares of the Lambda_b and B wave functions at the origin be \le 1.
Comments: final journal version to appear in JETP Letters