Observation of the Decay $B^0\to {\pi }^0{\pi }^0$

Abstract

We present an observation of the decay $B^0\to {\pi }^0{\pi }^0$ based on a sample of 124 million $B\bar{B}$ pairs recorded by the BABAR detector at the PEP-II asymmetric-energy $B$ Factory at SLAC. We observe $46\pm 13\pm 3$ 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 $\BR(B^{0} \to π^{0} π^{0}) = (2.1 \pm 0.6 \pm 0.3) \times 10^{-6}$, averaged over $B^0$ and ${\bar{B}}^0$ decays.

7 pages, 8 postscript figues, submitted to Physical Review Letters

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