Obervation of \chi_{cJ}--> omega omega decays

TL;DR

This paper reports the first observation of _{c0,2} decays into omega omega pairs, measuring their branching ratios with statistical significance using data from the BESII detector.

Contribution

First observation of _{c0,2}  decays into omega omega pairs and measurement of their branching ratios.

Findings

Branching ratio for _{c0} o  is (2.29 .58 .41) imes 10^{-3}

Branching ratio for _{c2} o  is (1.77 .47 .36) imes 10^{-3}

Signals observed with significances of 4.4 and 4.7 sigma

Abstract

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