Perturbative heavy quarkonium spectrum at next-to-next-to-next-to-leading order
Abstract
We compute the energy levels of some of the lower-lying heavy quarkonium states perturbatively up to O(alphas5*m) and O(alphas5*m*log[alphas]). Stability of the predictions depends crucially on the unknown 4-loop pole-MSbar mass relation. We discuss the current status of the predictions with respect to the observed bottomonium spectrum.
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