| Abstract |
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The $B^0$ meson decay modes $B^0 \rightarrow D^{*-} p {\overline p} \pi^+$,
$D^{-} p {\overline p} \pi^+$, ${\overline D}^{*0} p {\overline p}$, and
${\overline D}^{0} p {\overline p}$
are studied in a sample of $124\times 10^{6}$ $B{\overline B}$ pairs collected with
the $BaBar$ detector at the PEP-II collider.
The decay of $B^0 \rightarrow D^{-} p {\overline p} \pi^+$ is observed for the first time,
with a measured branching fraction ${\cal B}(B^0 \rightarrow D^{-} p
{\overline p} \pi^+)=(3.80\pm 0.35\pm 0.46)\times 10^{-4}$.
The following branching fractions are also
determined: ${\cal B}(B^0 \rightarrow D^{*-} p {\overline p} \pi^+)=
(5.61\pm 0.59\pm 0.73)\times 10^{-4}$,
${\cal B}(B^0 \rightarrow {\overline D}^{*0} p {\overline p})=
(0.67\pm 0.21\pm 0.09)\times 10^{-4}$,
and ${\cal B}(B^0 \rightarrow {\overline D}^{0} p {\overline p})=
(1.24\pm 0.14\pm 0.12)\times 10^{-4}$.
In each decay mode the invariant mass spectra of the charmed mesons and the
baryons are compared with a pure phase-space hypothesis
in order to gain insight into the $B$ meson decay dynamics. In particular,
the Dalitz plots of ${\overline D}^{*0} p$
versus ${\overline D}^{*0} {\overline p}$ for
$B^0 \rightarrow {\overline D}^{*0} p {\overline p}$ and of ${\overline D}^{0} p$
versus ${\overline D}^{0} {\overline p}$ for $B^0 \rightarrow {\overline
D}^{0} p {\overline p}$ are presented. All results are preliminary.
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