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 — preprints:1997:ttp97-18 [2016/03/17 11:03] (current) Line 1: Line 1: + ====== TTP97-18 Heavy Quark Current Correlators to ${\cal O}(\alpha_s^2)$  ====== + + + In this paper the three-loop polarization functions \Pi(q^2) + 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 + $\sigma(e^+e^- \to Z \to hadrons)$ and to the Higgs + decay rates, respectively. + + + |**K.G. Chetyrkin, J.H. Kuehn, M. Steinhauser**  | + |** Nucl. Phys. B505 40-64 1997  **  | + | {{preprints:1997:ttp97-18.pdf|PDF}} {{preprints:1997:ttp97-18.ps|PostScript}} [[http://arxiv.org/abs/hep-ph/9705254|arXiv]]   | + | |