Abstract
Abstract Two-loop contributions of massive and massless fermions to the Chern-Simons term are analytically calculated in D = 3 electrodynamics with exact and spontaneously broken gauge symmetry. Massless particles produce non-zero irrational corrections. Because corresponding abelian diagrams enter with independent colour weight, the integerness of the Chern-Simons coupling in the non-abelian theory is violated by renormalizations. Supersymmetry is shown to result in a partial cancellation of the contributions.
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