====== TTP95-41 Heavy Quark Vacuum Polarization to Three Loops   ======
 
 
   <hidden TTP95-41  Heavy Quark Vacuum Polarization to Three Loops   > The real and imaginary part of the vacuum polarization function
 $\Pi(q^2)$ induced by a massive quark is calculated in perturbative 
 QCD up to order $\alpha_s^2$. The method is described and the
 results are presented. This extends the calculation by 
 K\"all\'en and Sabry from two to three loops.
 </hidden>
|**K.G. Chetyrkin, J.H. Kuehn, M. Steinhauser**  | 
|** Phys. Lett. B371 93-98 1996  **  |
| {{preprints:1995:ttp95-41.pdf|PDF}} {{preprints:1995:ttp95-41.ps|PostScript}} [[http://arxiv.org/abs/hep-ph/9511430|arXiv]]   |
| |