Observation of B0->pi0pi0
Y. Chao, et al. (for the Belle Collaboration)
TL;DR
This paper reports the first observation of the B0->pi0pi0 decay, measuring its branching fraction and direct CP violation, providing new insights into B meson decay processes and CP violation.
Contribution
First observation of B0->pi0pi0 decay, including measurement of its branching fraction and direct CP asymmetry.
Findings
Branching fraction BF(B0->pi0pi0) = (2.32 +0.4-0.5(stat) +0.2-0.3(syst)) x 10^-6
Significance of 5.8 standard deviations for the decay
First measurement of direct CP violation in this decay mode
Abstract
We report the first observation of the decay B0->pi0pi0, using a 253/fb data sample collected at the Upsilon(4S) resonance with the Belle detector at the KEKB e+e- collider. The measured branching fraction is BF(B0->pi0pi0) = {2.32 +0.4-0.5(stat) +0.2-0.3(syst)} x 10^-6, with a significance of 5.8 standard deviations including systematic uncertainties. We also make the first measurement of the direct CP violating asymmetry in this mode.
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