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- W2191285454 abstract "We report the observation of the decay B0→π0π0, using a 253 fb−1 data sample collected at the Υ(4S) resonance with the Belle detector at the KEKB e+e− collider. The measured branching fraction is B(B0→π0π0)=(2.3−0.5−0.3+0.4+0.2)×10−6, with a significance of 5.8 standard deviations including systematic uncertainties. We also make a measurement of the direct CP violating asymmetry in this mode.Received 22 December 2004DOI:https://doi.org/10.1103/PhysRevLett.94.181803©2005 American Physical Society" @default.
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