Decay constants, semi-leptonic and non-leptonic decays in a Bethe-Salpeter Model

We evaluate the decay constants for the B and $D$ mesons and the form factors for the semileptonic decays of the B meson to $D$ and $D^*$ mesons in a Bethe-Salpeter model. From data we extract $V_{cb}=0.039 \pm 0.002$ from ${\bar B} \to D^* l {\barν}$ and $V_{cb}=0.037 \pm 0.004$ from ${\bar B} \to D l {\barν}$ decays. The form factors are then used to obtain non-leptonic decay partial widths for $B\to D π(K)$ and $B \to D D (D_s)$ in the factorization approximation.

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