Quark mass effects to σ(e+e- -> hadrons) at O(αs3)
K. G. Chetyrkin, R. Harlander, J. H. Kuehn
Abstract
The calculation of the quartic mass terms at order αs3 to the hadronic R ratio is described. It is based on the operator product expansion for the quark current correlator, combined with an application of the renormalization group equation.
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