Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2004-08-22
Phys.Rev.Lett.94:181803,2005
Physics
High Energy Physics
High Energy Physics - Experiment
6 pages, 2 figures, submitted to ICHEP04, Beijing and Physical Review Letters. v2: a possible pile-up background is checked an
Scientific paper
10.1103/PhysRevLett.94.181803
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.
Chao Yuan
for the Belle Collaboration
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