====== TTP96-13 Three-Loop Polarization Function and ${\cal O}(\alpha_s^2)$  Corrections to the Production of Heavy Quarks ======
 
 
   <hidden TTP96-13  Three-Loop Polarization Function and ${\cal O}(\alpha_s^2)$  Corrections to the Production of Heavy Quarks > The three-loop vacuum polarization function $\Pi(q^2)$
 induced by a massive quark is calculated. A comprehensive
 description of the method is presented.
 From the imaginary part the ${\cal O}(\alpha_s^2)$ result
 for the production of heavy quarks 
 $R(s)=\sigma(e^+e^-\to \mbox{hadrons})/\sigma(e^+e^-\to \mu^+\mu^-)$
 can be extracted. Explicit formulae separated into the different
 colour factors are given.
 </hidden>
|**K.G. Chetyrkin, J.H. Kuehn, M. Steinhauser**  | 
|** Nucl. Phys. B482 213-240 1996  **  |
| {{preprints:1996:ttp96-13.pdf|PDF}} {{preprints:1996:ttp96-13.ps|PostScript}} [[http://arxiv.org/abs/hep-ph/9606230|arXiv]]   |
| |