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

Abstract

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-Wise functions equal as required by heavy quark symmetry and at non-zero recoil, 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. As by-products, we also estimate SU(3) breaking effects in the mass and the decay constant.

13 Pages latex, 9 figures available upon request

References in corpus (5)

• The Residual Mass Term in the Heavy Quark Effective Theory
• The Isgur-Wise Function in Small Velocity Limit
• Isgur-Wise Functions from the Mit Bag Model
• The Isgur-Wise Function from the Lattice
• Phenomenology of $B_s$ Decays

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