Semileptonic $B_{q}\to D^{\ast}_{q}lν$ $(q=s, d, u)$ transitions in QCD

Abstract

The form factors relevant to $B_{q}\to D^{\ast}_{q}(J^{P}=1^{-})\ellν$ $(q=s, d, u)$ decays are calculated in the framework of the three point QCD sum rules approach. The heavy quark effective theory prediction of the form factors are obtained. The total decay width and branching ratio for these decays are also evaluated using the $q^2$ dependencies of these form factors.

4 pages, 4 figures and 3 tables. To be published in the proceedings of the 14th International QCD Conference (QCD 08), Montpellier, France, 7-12 July 2008