Recent studies of CP violation in bottom meson decays at Belle

TL;DR

This paper summarizes recent Belle experiment results on CP violation in bottom meson decays, including measurements of branching fractions, polarization, and asymmetries, providing insights into the CKM angles and CP violation phenomena.

Contribution

It reports new preliminary measurements of CP violation parameters and decay properties in B meson decays, enhancing understanding of the CKM matrix and CP violation.

Findings

Measured CP asymmetries in B decays.

Updated constraints on CKM angle φ₂.

Sensitivity analysis for CKM angle φ₃.

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.