Operator Product Expansion on the Lattice: a Numerical Test in the Two-Dimensional Non-Linear Sigma-Model

Abstract

We consider the short-distance behaviour of the product of the Noether O(N) currents in the lattice nonlinear sigma-model. We compare the numerical results with the predictions of the operator product expansion, using one-loop perturbative renormalization-group improved Wilson coefficients. We find that, even on quite small lattices (m a \approx 1/6), the perturbative operator product expansion describes that data with an error of 5-10% in a large window 2a \ltapprox x \ltapprox m^{-1}. We present a detailed discussion of the possible systematic errors.

53 pages, 11 figures (26 eps files)

Cited by in corpus (7)

• Nucleon structure functions from lattice operator product expansion
• Renormalization Constants of Quark Operators for the Non-Perturbatively Improved Wilson Action
• Calculation of Moments of Structure Functions
• Structure functions of the 2d O(n) non-linear sigma models
• Structure functions of 2d integrable asymptotically free models
• Energy-momentum tensor in QCD: nucleon mass decomposition and mechanical equilibrium
• Trans-series from condensates in the non-linear sigma model