# Measurement of the branching fraction and $CP$ asymmetry in $B^{0} \to \pi^{0}\pi^{0}$ decays, and an improved constraint on $\phi_{2}$

## TL;DR

This study measures the branching fraction and CP asymmetry in B0 to pi0 pi0 decays, providing new constraints on the CKM angle phi_2, with results based on a large data sample from the Belle experiment.

## Contribution

The paper presents the first precise measurement of the B0 to pi0 pi0 decay parameters and improves the constraints on the CKM angle phi_2 through combined analysis.

## Key findings

- Branching fraction: (1.31 ± 0.19 (stat) ± 0.19 (syst)) × 10^{-6}
- CP asymmetry: +0.14 ± 0.36 (stat) ± 0.10 (syst)
- Excluded phi_2 range: 15.5° to 75.0° at 95% CL

## Abstract

We measure the branching fraction and $CP$ violation asymmetry in the decay $B^{0}\to \pi^{0}\pi^{0}$, using a data sample of $752\times 10^{6}$ $B\bar{B}$ pairs collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB $e^{+}e^{-}$ collider. The obtained branching fraction and direct $CP$ asymmetry are $ \mathcal{B}(B\to \pi^{0}\pi^{0}) = [1.31 \pm 0.19~ \text{(stat.)} \pm 0.19~ \text{(syst.)}] \times 10^{-6}$ and $ A_{CP} = +0.14 \pm 0.36~ \text{(stat.)} \pm 0.10~ \text{(syst.)}, $ respectively. The signal significance, including the systematic uncertainty, is 6.4 standard deviations. We combine these results with Belle's earlier measurements of $B^{0}\to \pi^{+} \pi^{-}$ and $B^{\pm} \to \pi^{\pm} \pi^{0}$ to exclude the $CP$-violating parameter $\phi_{2}$ from the range $15.5^{\circ} < \phi_{2} < 75.0^{\circ}$ at 95\% confidence level.