Results on $ϕ_2$ from Belle
We present a summary of measurements sensitive to the CKM angle $ϕ_2$, performed by the Belle experiment using the final data sample of $772 \times 10^{6}$ $B\bar{B}$ pairs produced at the $Υ(4S)$ resonance at the KEK asymmetric $e^+e^-$ collider. We discuss $CP$ asymmetries from the decay $B^{0} \rightarrow π^{+} π^{-}$ and briefly mention a preliminary measurement of the branching fraction of $B\toπ^0π^0$ decays. Furthermore the measurement of the branching fraction of $B^{0}\rightarrow ρ^0ρ^0$ decays and fraction of longitudinal polarization in this decay is presented. We use the results to constrain $ϕ_2$ with isospin analyses in the $B\rightarrow ππ$ and $B\rightarrowρρ$ systems.
hep-ex↗