Fermion theories on a 2d torus with Wilson action improved by Pauli -- Villars regularization

Abstract

Vectorial and anomaly free chiral U(1) fermion models on a 2d finite lattice are considered. It is demonstrated both numerically and analytically that introduction of Pauli -- Villars type regularization supresses the symmetry breaking effects caused by the Wilson term.

Comments: 17 pages, Latex, 6 eps-figures