Vector Correlator in Massless QCD at Order O(alpha_s^4) and the QED beta-function at five loop
| Autor: | Baikov, P. A., Chetyrkin, K. G., Kühn, J. H., Rittinger, J. |
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| Rok vydání: | 2012 |
| Předmět: | |
| Zdroj: | JHEP 1207 (2012) 017 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1007/JHEP07(2012)017 |
| Popis: | We present a concise summary of recent results for the vector correlator in massless QCD at order ${\cal O}(\alpha_s^4)$, with all colour factors being given for a generic colour group. As a direct consequence we arrive at: (i) the full QCD contribution to the QED $\beta$--function of order $\alpha^2\, \alpha_s^4$ in the MSbar- and MOM-schemes; (ii) the full five-loop result of order $\alpha^6$ for the $\beta$-function of QED with a generic number of single-charged fermions, again for the MSbar- and MOM-schemes. Comment: 14 pages, 1 figure; Few misprints corrected. Results are untouched |
| Databáze: | arXiv |
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