Heavy Quark Current Correlators to O(αs2)
K. G. Chetyrkin, J. H. Kühn, M. Steinhauser
Abstract
In this paper the three-loop polarization functions Π(q2) are calculated for the cases of an external vector, axial-vector, scalar or pseudo-scalar current. Results are presented for the imaginary part which directly leads to the cross section σ(e+e- Z hadrons) and to the Higgs decay rates, respectively.
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