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Measurement of the branching fraction and

C P

-violating asymmetry of the decay

B^{0} \to π^{0} π^{0}

using 387 million

ϒ (4 S)

decays in Belle II data

https://doi.org/10.1103/PhysRevD.111.L071102

Adachi, I; Aggarwal, L; Ahmed, H; Aihara, H; Alhakami, M; Aloisio, A; Althubiti, N; Anh_Ky, N; Asner, D M; Atmacan, H; et al (April 2025, Physical Review D)

We measure the branching fraction and

C P

-violating flavor-dependent rate asymmetry of

B^{0} \to π^{0} π^{0}

decays reconstructed using the Belle II detector in an electron-positron collision sample containing

387 \times 10^{6} ϒ (4 S)

mesons. Using an optimized event selection, we find

125 \pm 20

signal decays in a fit to background-discriminating and flavor-sensitive distributions. The resulting branching fraction is

(1.25 \pm 0.23) \times 10^{- 6}

and the

C P

-violating asymmetry is

0.03 \pm 0.30

. Published by the American Physical Society2025

Free, publicly-accessible full text available April 1, 2026

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