paper

Leptonic contribution to the effective electromagnetic coupling constant up to three loops

arXiv:hep-ph/9803313 · doi:10.1016/S0370-2693(98)00503-6

Abstract

In this note the leptonic contribution to the running of the electromagnetic coupling constant is discussed up to the three-loop level. Special emphasize is put on the evaluation of the double-bubble diagrams.

5 pages (Latex) 2 figures

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