  I present here results of a time-dependent analysis of the Dalitz structure
of neutral $B$ meson decays to
  $\pip\pim\piz$ from a dataset of 346 million $B \bar B$ pairs collected at
the $\Upsilon(4S)$ center of mass energy by the BaBar detector at the SLAC
PEP-II $e^+e^-$ accelerator. No significant CP violation effects are observed
and 68% confidence interval is derived on the weak angle $\alpha$ to be
[75$^o$,152$^o$]
