Light Flavor Dependence of the Isgur-Wise Function

Abstract

We present an investigation on the ligh flavor dependence of the Isgur-Wise function for $B_a\to D_a$ and $B_a\to D_a^{\ast }$ in the framework of QCD sum rules. It is found that the Isgur-Wise function for $B_s$ decay falls faster than that for $B_{u,d}$ decay , which is just contrary to the recent prediction of the heavy meson chiral perturbation theory. SU(3) symmetry breaking effects in the mass and the decay constant are also estimated.

arXiv comment(Invited talk given by T.Huang at ICHEP '94, Glasgow, July 1994.), Latex, 5 pages+2 figures, BIHEP-TH-94-35