Quenched and Unquenched Chiral Perturbation Theory in the ε-Regime
Abstract
The chiral limit of finite-volume QCD is the ε-regime of the theory. We discuss how this regime can be used for determining low-energy observables of QCD by means of comparisons between lattice simulations and quenched and unquenched chiral perturbation theory. The quenched theory suffers in the ε-regime from ``quenched finite volume logs'', the finite-volume analogs of quenched chiral logs.
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