====== TTP99-42 Quark mass effects to \sigma(e^+e^-  ->  hadrons) at O(\alpha_s^3) ======
 
 
   <hidden TTP99-42  Quark mass effects to \sigma(e^+e^-  ->  hadrons) at O(\alpha_s^3) > The calculation of the quartic mass terms at order \alpha_s^3 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.
 </hidden>
|**K.G. Chetyrkin, R. Harlander, and J.H. Kuehn**  | 
|**      Proc. Int. Europhysics Conf. on High Energy Physics (EPS-HEP99),  Tampere, Finland 1999, pg. 382-384 **  |
| {{preprints:1999:ttp99-42.pdf|PDF}} {{preprints:1999:ttp99-42.ps|PostScript}} [[http://arxiv.org/abs/hep-ph/9910345|arXiv]]   |
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