Obervation of χ_{cJ}--> omega omega decays

Decays of $χ_{c0,2}\ar\ww$ are observed for the first time using a sample of $14.0\times 10^6$ $ψ(2S)$ events collected with the BESII detector. The branching ratios are determined to be ${\cal B}(χ_{c0}\ar \ww)=(2.29\pm 0.58\pm 0.41)\times 10^{-3}$ and ${\cal B}(χ_{c2}\ar\ww)=(1.77\pm 0.47\pm 0.36)\times 10^{-3}$, where the first errors are statistical and the second systematic. The significances of the two signals are $4.4σ$ and $4.7σ$, respectively.

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