Renormalization-group flow of the U(1) lattice gauge theory with staggered fermions is studied by the Migdal-Kadanoff renormalization-group method. The phase structure is extensively investigated. It is shown that an induced four-Fermi coupling term becomes relevant in the strong-gauge-coupling region while it becomes irrelevant in the weak-gauge-coupling one. The β function, the chiral order parameter, and the anomalous dimension of the fermion mass operator are calculated.

• Received 27 February 1990

DOI:https://doi.org/10.1103/PhysRevD.42.610