Test of factorization hypothesis from exclusive nonleptonicBdecays

We investigate the possibility of testing the factorization hypothesis in nonleptonic exclusive decays of the B meson. In particular, we consider the nonfactorizable $B^0\to D^{\left(*\right)+}{D}_s^{\left(*\right)-}$ modes and $B^0\to D^{\left(*\right)+}({\pi }^{-},{\rho }^{-})$ known as well-factorizable modes. By taking the ratios $\mathcal{B}(B^0\to D^{\left(*\right)+}{D}_s^{\left(*\right)-})/\mathcal{B}[B^0\to D^{\left(*\right)+}({\pi }^{-},{\rho }^{-}\left)\right],$ we find that under the present theoretical and experimental uncertainties there is no evidence for the breakdown of the factorization description for heavy-heavy decays of the B meson.