Operator Product Expansion on the Lattice: a Numerical Test in the   Two-Dimensional Non-Linear Sigma-Model
  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. 
Sergio Caracciolo, Andrea Montanari and Andrea Pelissetto