Operator product expansion and non-perturbative renormalization

Abstract

It has been recently proposed to use the operator product expansion to evaluate the expectation values of renormalized operators without the need of a direct computation of the relevant renormalization constants. We test the viability of this idea in the two-dimensional non-linear sigma-model discussing the non-perturbative renormalization of the energy-momentum tensor.

Comments: LATTICE98(matrixelement), uses espcrc2 and epsfig, 3 pages, 2 eps figures