Non-perturbative improvement of lattice QCD at large momenta

Abstract

We propose a method to improve lattice operators composed of Wilson fermions which allows the removal of all corrections of $O(a)$, including those proportional to the quark mass. It requires off-shell improvement of quark fields and composite operators, which is achieved by studying the behaviour of quark and gluon correlation functions at large momenta.

Comments: 28 pages, plain Latex. Corrected misleading reference. Version to appear in NPB