Measurement of the ckm angle φ3 using b → dk at Belle II

We present the preliminary Monte Carlo (MC) study of the B± → D0 K±, D0 → K0Sπ+π− decays to extract φ3 at the Belle II along. We discuss here the improvement in φ3 measurement one may expect at Belle II with 50 ab−1 . We also present preliminary reconstruction of the K0SandD0 → K0Sπ+π− using the Phase II data and compared with MC.