Results for \phi_1 and \phi_2 from Belle

TL;DR

This paper summarizes measurements of CP asymmetries and branching fractions related to CKM angles 1 and 2 from the Belle experiment, providing insights into CP violation and constraining the unitarity triangle.

Contribution

It provides the first comprehensive summary of Belle's measurements of 1 and 2 sensitive observables using the full data sample, including new constraints on 2 from 0 ho ho decays.

Findings

Measured CP asymmetries in B decays sensitive to 1 and 2.

Determined branching fractions and polarization fractions in B decays.

Constrained 2 using isospin analysis in the  ho ho system.

Abstract

We present a summary of measurements sensitive to the CKM angles \phi_1 and \phi_2, performed by the Belle experiment using the final data sample of 772 \times 10^{6} $B\bar{B}$ pairs at the \Upsilon(4S) resonance produced at the KEK asymmetric e^+e^- collider. We discuss CP asymmetries from the decays $B^{0}\to c\bar{c} K^{0}$, $D^{(*)+}D^{(*)-}$ which are sensitive to \phi_1 and from $B \to \pi^{+} \pi^{-}$, $a_1{\pm}\pi^{\mp}$ being sensitive to \phi_2. Furthermore the measurement of the branching fraction of $B^{0}\to \rho^0\rho^0$ decays and fraction of longitudinal polarization in this decay is presented and used to constrain \phi_2 with an isospin analysis in the $B\to \rho\rho$ system.