On the reduction of hypercubic lattice artifacts

Abstract

This note presents a comparative study of various options to reduce the errors coming from the discretization of a Quantum Field Theory in a lattice with hypercubic symmetry. We show that it is possible to perform an extrapolation towards the continuum which is able to eliminate systematically the artifacts which break the O(4) symmetry.

Comments: 15 pages. 4 figures. Minor changes (Appendix and refs added)