====== TTP08-03 Massless propagators: applications in QCD and QED ======
 
 
   <hidden TTP08-03  Massless propagators: applications in QCD and QED > We report on two recent results based on the evaluation of five-loop massless propagators in QCD and QED: (i) corrections of order $\alpha_s^4$ to the absorptive part of the polarization function in QCD with $n_f=3$;(ii) the five-loop contribution to the $\beta$ function of quenched QED.
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|**P.A. Baikov, K.G. Chetyrkin and  J.H.K\"uhn**  | 
|**  PoS    RADCOR2007 023 2007  **  |
| {{preprints:2008:ttp08-03.pdf|PDF}} {{preprints:2008:ttp08-03.ps|PostScript}} [[http://arxiv.org/abs/0810.4048|arXiv]]   |
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