Composite operators from the operator product expansion: what can go wrong?
classification
✦ hep-lat
keywords
productcompositeexpansionoperatoroperatorsasymptoticcomputediscuss
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The operator product expansion is used to compute the matrix elements of composite renormalized operators on the lattice. We study the product of two fundamental fields in the two-dimensional sigma-model and discuss the possible sources of systematic errors. The key problem turns out to be the violation of asymptotic scaling.
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