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

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

2008-06-03

arxiv.org/abs/0806.0578v2

Phys.Rev.D78:054011,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

28 Pages, 6 Figures and 9 Tables

Scientific paper

10.1103/PhysRevD.78.054011

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 sum rules approach. The heavy quark effective theory prediction of the form factors as well as $1/m_{b}$ corrections to those form factors are obtained. A comparison of the results for the ratio of form factors at zero recoil limit and other values of $q^{2}$ with the predictions of the subleading Isgur-Wise form factor application for $B\to D^{\ast}\ell\nu$ is presented. The total decay width and branching ratio for these decays are also evaluated using the $q^2$ dependencies of these form factors. The results are in good agreement with the constituent quark meson model and existing experimental data. The $q=s$ case can also be detected at LHC in the near future.

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