Heavy Quarkonia Results from CLEO

Heavy quarkonium cc̄ (cc̄ charmonium, bb̄ bottomonium) provides the best means of testing QCD, both the validity of perturbative QCD and potential models, and lattice QCD calculations. Bottomonium is better than charmonium, both because it has smaller relativistic problems (< v/c >≈ 0.1 versus ≈ 0.2) and smaller coupling constant (α ≈ 0.2 versus ≈ 0.35), but much less high precision spectroscopic information is available for bottomonium. No bb̄ singlet states are known, and very few hadronic and radiative decays are known. Nevertheless, progress is being made through recently taken Υ(nS) data with CLEO III with much larger luminosity than before, the event counts being Υ(1S) ∼ 20 million, Υ(2S) ∼ 10 million, and Υ(3S) ∼ 50 million. With the beginning of the CLEO-c program, interesting new results are also being produced in the charmonium region, ψ(2S) ∼ 3 million. I will now review some of the most recent results, first in bottomonium spectroscopy, and then in charmonium spectroscopy.