2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/189433Using the Zumino identities it is shown that in a class of non-local gauges, massless QED_3 has an infrared behaviour of a conformal field theory with a continuously varying anomalous dimension of the fermion. In the usual Lorentz gauge, the fermion propagator falls off exponentially for a large separation, but this apparent fermion mass is a gauge artifact.10 pages; changes made mainly to clarify the result in the usual Lorentz gauge; to appear in Phys. Lett. BHigh Energy Physics - TheoryHigh Energy Physics - Phenomenologytext