B --> D(D^*) Form Factors in a Bethe-Salpeter model

A. Abd El-Hady, Alakabha Datta, K. S. Gupta, J. P. Vary

Published 1996-05-25Version 1

We calculate the form factors for the semileptonic decays of the $B$ meson to $D$ and $D^*$ mesons in a Bethe-Salpeter model. We show that our model is consistent with the constraints of Heavy Quark Effective Theory (HQET) and we extract the matrix elements that represent the $1/m_Q$ corrections to the form factors in HQET. With available data, we obtain $V_{cb} $=$ (31.9 \pm 1.4)\times10^{-3}$.