ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2003, vol. 91, p. 241801/1-241801/7
Observation of a significant excess of π0π0 events in B meson decays
Several 46±13±3 B0→π0π0 events with a significance of 4.2 standard deviations including systematic uncertainties were observed. A branching fraction Β(beta;0→π0π0)=(2.1±0 .6±0.3)X10-6 was measured. The systematic uncertainties from PDF variations and efficiency were combined in quadrature.