Charmonium in China: BEPCII/BESIII


Abstract in English

Results based on 106 M $psi$ events and about 226 M $J/psi$ events acquired with the BESIII detector at BEPCII are reported, including a confirmation of the BESII $pbar{p}$ threshold enhancement in $J/psi to gamma pbar{p}$, branching ratios for $chi_{cJ} to pi^0 pi^0$ and $eta eta$, and first measurements of the branching ratios for $psi to pi^0 h_c$ and $h_c to gamma eta_c$, as well as measurements of the mass and width of the $h_c$. Also reported are first observations of the two photon process $psi to gamma gamma J/psi$ and $f_0(980) - a_0(980)$ mixing.

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