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The form factors relevant to $B_{q}\to D^{\ast}_{q}(J^{P}=1^{-}) ell\nu$$(q=s, d, u)$ decays are calculated in the framework of the three point QCD sumrules approach. The heavy quark effective theory prediction of the form factorsas well as $1/m_{b}$ corrections to those form factors are obtained. Acomparison of the results for the ratio of form factors at zero recoil limitand other values of $q^{2}$ with the predictions of the subleading Isgur-Wiseform factor application for $B\to D^{\ast}\ell\nu$ is presented. The totaldecay width and branching ratio for these decays are also evaluated using the$q^2$ dependencies of these form factors. The results are in good agreementwith the constituent quark meson model and existing experimental data. The$q=s$ case can also be detected at LHC in the near future.

Semileptonic $B_{q}\to D^{\ast}_{q}l\nu $ $(q=s, d, u)$ Decays in QCD Sum Rules