Analysis of Decays $B \to \pi^+\pi^-\pi^0$ With Full Belle Data Sample

We report the current status of a time-dependent Dalitz analysis of the decays $B \to \pi^+\pi^-\pi^0$ with the full Belle data sample. In this analysis we measure the CKM angle $\phi_2$ ($\alpha$) and search for BSM sources of CP violation. We discuss the sources of systematic uncertainties including the measurement of $\pi^0$ reconstruction efficiency as the function of $\pi^0$ momentum which is important to understand for extracting the final results from the data.