Exclusive semileptonic decay of D and B mesons in the independent quark model

We investigate the exclusive semileptonic decay modes ${\mathit{D}}^0$→K,${\mathit{K}}^{\mathrm{*}}$ and B${\mathrm{¯}}^0$→D,${\mathit{D}}^{\mathrm{*}}$ in a field-theoretic framework based on the independent quark model with a scalar-vector-harmonic potential. Our predictions for the relevant form factors and their ${\mathit{q}}^2$ dependence are in reasonable agreement with the expectations of HQET and those of several other models. We predict that the decay width ratio and the polarization ratio for ${\mathit{D}}^0$ decays are Γ(${\mathit{D}}^0$→${\mathit{K}}^{\mathrm{*}\mathrm{-}}$)/Γ(${\mathit{D}}^0$→${\mathit{K}}^{\mathrm{-}}$)=0.68 and ${\mathrm{\Gamma }}_{\mathit{L}}$(${\mathit{D}}^0$→${\mathit{K}}^{\mathrm{*}\mathrm{-}}$)/${\mathrm{\Gamma }}_{\mathit{T}}$(${\mathit{D}}^0$→${\mathit{K}}^{\mathrm{*}\mathrm{-}}$)=0.52 and those for B${\mathrm{¯}}^0$ decays are Γ(B${\mathrm{¯}}^0$→${\mathit{D}}^{\mathrm{*}+}$)/Γ(B${\mathrm{¯}}^0$→${\mathit{D}}^{+}$)=1.87 and ${\mathrm{\Gamma }}_{\mathit{L}}$(B${\mathrm{¯}}^0$→${\mathit{D}}^{\mathrm{*}+}$)/${\mathrm{\Gamma }}_{\mathit{T}}$(B${\mathrm{¯}}^0$→${\mathit{D}}^{\mathrm{*}+}$)=0.77, respectively. © 1996 The American Physical Society.