Recent studies of CP violation in bottom meson decays at Belle

Abstract

We present a summary of recent studies on $CP$ violation with the Belle experiment using the final data sample of $772 \times 10^{6}$ B\bar{B} pairs produced at the Ypsilon(4S) resonance at the KEK asymmetric e^+ e^- collider. We discuss preliminary measurements of the branching fraction, the polarization and the $CP$ asymmetries of the decay $B^0 \rightarrow \rho^{+} \rho^{-}$ and an updated constraint on the CKM angle $\phi_2$ from the $B\to\rho\rho$ system. Being also related to $\phi_2$, we present a preliminary measurement of the branching fraction of $B^0\rightarrow \pi^0\pi^0$ decays. Last, a preliminary model independent dalitz plot analysis of the decay $B^0 \rightarrow D^0[K_S^0\pi^+\pi^-]K^{*0}$ is presented and its sensitivity to the CKM angle $\phi_3$ is discussed.