We present a study of the decay B0→π0π0 based on a sample of 124×106 BB̅ pairs recorded by the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. We observe 46±13±3 events, where the first error is statistical and the second is systematic, corresponding to a significance of 4.2 standard deviations including systematic uncertainties. We measure the branching fraction B(B0→π0π0)=(2.1±0.6±0.3)×10-6, averaged over B0 and B̅ 0 decays.
Observation of a Significant Excess of π^{0}π^{0} Events in B Meson Decays
LO VETERE, MAURIZIO;MONGE, MARIA ROBERTA;PATRIGNANI, CLAUDIA;TOSI, SILVANO;
2003-01-01
Abstract
We present a study of the decay B0→π0π0 based on a sample of 124×106 BB̅ pairs recorded by the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. We observe 46±13±3 events, where the first error is statistical and the second is systematic, corresponding to a significance of 4.2 standard deviations including systematic uncertainties. We measure the branching fraction B(B0→π0π0)=(2.1±0.6±0.3)×10-6, averaged over B0 and B̅ 0 decays.
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