Results for ϕ_1 and ϕ_2 from Belle

Abstract

We present a summary of measurements sensitive to the CKM angles ϕ_1 and ϕ_2, performed by the Belle experiment using the final data sample of 772 \times 10^{6} $B\bar{B}$ pairs at the Υ(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 ϕ_1 and from $B \to π^{+} π^{-}$, $a_1{\pm}π^{\mp}$ being sensitive to ϕ_2. Furthermore the measurement of the branching fraction of $B^{0}\to ρ^0ρ^0$ decays and fraction of longitudinal polarization in this decay is presented and used to constrain ϕ_2 with an isospin analysis in the $B\to ρρ$ system.

Proceedings of CKM2012, the 7th International Workshop on the CKM Unitarity Triangle, Cincinnati, USA, 6-10 September 2012