New method of determiningFπon the lattice

Abstract
We derive the two-point spectral correlation function of the Dirac operator with a specific external source in the ϵ regime of QCD. This correlation function has a unique and strong dependence on Fπ, and thus provides an novel way to extract Fπ from lattice simulations. We test the method in a quenched lattice simulation with staggered fermions.
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