QCD STRUCTURE OF QUARKONIUM SPIN SPECTRA

We show that our QCD calculation of the 1P1 charmonium state can be incorporated into a global description of the fine and hyperfine structure of the charmonium and bottomonium systems. We propose a simple renormalization prescription in which all ambiguities are absorbed into a single strong coupling constant alpha(s). We find that the O(alpha(s)2) perturbative QCD potential leads to a consistent description of all splittings. The results are used to predict the unmeasured bottomonium P-wave hyperfine splittings.