Observation of B0->pi0pi0

et al. (for the Belle Collaboration); Y. Chao

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Observation of B0->pi0pi0

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arxiv hep-ex/0408101 v3 pith:FHFLEOX7 submitted 2004-08-22 hep-ex

Y. Chao , et al. (for the Belle Collaboration) This is my paper · ORCID

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keywords pi0pi0firstobservationasymmetrybellebranchingcollectedcollider

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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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