Light Quark Dependence of the Isgur-Wise Function from QCD Sum rules

Tao Huang, Chuan-Wang Luo

We study light quark 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. At zero recoil , all the Isgur-W…