Recent studies of Charmonium Decays at CLEO

Decays of a bound state of a quark and its antiquark, quarkonium, provide an excellent laboratory for studying QCD. Particularly, heavy quarkonia such as charmonium states are less relativistic, thus play a special role in probing strong interactions. CLEO recently has accumulated data taken at the ψ(2S) resonance, providing a total of 27M ψ(2S) decays. With the combination of this large statistical sample and the excellent CLEO detector, we will explore an unprecedented world of charmonia. While many analyses are currently being carried out, in this note we present recent results on multi-body χcJ decays which employed the pre-existing 3M ψ(2S) sample. We also present recent studies on decays of one of the exotic states, Y(4260), as well as precision measurement on M(D) that has an implication on properties of X(3872). Finally, based on the full sample of ψ(2S) data, we have results on properties of one of the light mesons, η.