at the zero recoil point where it is known that the experiments should find no events so that extrapolations and pole models have to be used. Thirdly, the decay widths at $q^2=0$ are given in terms of only one form factor $A_{0}(0)$ (defined below). Finally, there is now a first report of the lattice calculation of the form factor $A_{0}(0)$ for the decay $\bar{B^{0}}\rightarrow   \rho^{+}   \ell^{-}   \bar{\nu_{\ell}}$ [@UKQCD], which is important phenomenologically for the determination of $|V_{ub}|$. They have determined a range of values for $A_{0}^{B^{0}\rightarrow  \rho^{+}}(0)$ and found that $A_{0}^{B^{+}      \rightarrow       \rho^{0}}(0)/\sqrt{2}      =
(0.16-0.35)^{+9}_{  \!  \,  -6}$, where the range is due to systematic uncertainty and the quoted error is statistical.

Semileptonic $D\rightarrow  V  \ell  \nu_{\ell}$ Decays
=======================================================

We define the form factors in the semileptonic decay of a $D$-meson $D(c\bar{q})$ into a vector meson $V(Q\bar{q})$ with the polarization vector $\varepsilon^{\mu}    $, by

$$\begin{aligned}
<V(p_{V},\varepsilon  )|\bar{Q}  \gamma_{\mu } (1-\gamma_{5} )c |
D(p_{D})> & = & \frac{2V(q^{2})}{m_{D}+m_{V}}  i \varepsilon_{\mu
\nu        \alpha        \beta        }        \varepsilon^{*\nu}
p^{\alpha}_{D}p^{\beta}_{V}-(m_{D}+m_{V})\varepsilon^{*\mu}
A_{1}(q^{2})      \nonumber     \\     &     &      \hspace{-3cm}
+\frac{(\varepsilon^{*}                                     \cdot
p_{D})}{m_{D}+m_{V}}(p_{D}+p_{V})^{\mu}       A_{2}(q^{2})-2m_{V}
\frac{(\varepsilon^{*}   \cdot  p_{D})}{q^{2}}  q^{\mu}  A(q^{2})\end{aligned}$$

The form factor $A$ can be written as $$\begin{aligned}
   A(q^{2})   &  =  &   A_{0}(q^{2})-A_{3}(q^{2})\end{aligned}$$ where $$\begin{aligned}
   A_{3}(q^{2})  &  =  &
