| Abstract |
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We study the decays $B^{-}\ra D^{*0} \pi^{-}$ and $B^{-}\ra D^{*0}
K^{-}$, where the $D^{*0}$ decays into $D^0\pi^0$, with the $D^0$
reconstructed in the CP-even ($CP+$) eigenstates $K^-K^+$ and $\pi^-\pi^+$
and in the (non-CP) channels $K^-\pi^+$, $K^-\pi^+\pi^+\pi^-$, and
$K^-\pi^+\pi^0$. Using a sample of about 123 million $B\overline{B}$
pairs, we measure the ratios of decay rates
\begin{displaymath}
R^{*}_{{\rm non-}CP}\equiv \frac{{\cal B}(B^-\ra D^{*0}_{{\rm
non-}CP}K^-)}{{\cal B}(B^-\ra D^{*0}_{{\rm non-}CP}\pi^-)} =
0.0813\pm0.0040{\rm stat}^{+0.0042}_{-0.0031}{\rm syst},
\end{displaymath}
and provide the first measurements of
\begin{displaymath}
R^{*}_{CP+}\equiv \frac{{\cal B}(B^-\ra D^{*0}_{CP+}K^-)}{{\cal B}(B^-\ra
D^{*0}_{CP+}\pi^-)} = 0.086 \pm0.021{\rm stat}\pm0.007{\rm syst},
\end{displaymath}
and of the CP asymmetry
\begin{displaymath}
A^*_{CP+}\equiv \frac{\{\cal B}(B^-{\ra}D^{*0}_{CP+}K^-)-{\cal
B}(B^+{\ra}D^{*0}_{CP+}K^+)}{{\cal B}(B^-{\ra}D^{*0}_{CP+}K^-)+{\cal
B}(B^+{\ra}D^{*0}_{CP+}K^+)}= -0.10\pm0.23{\rm stat}^{+0.03}_{-0.04}{\rm
syst}.
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