Abstract
We have studied pseudoscalar correlation functions computed using the overlap operator. Within the accuracy of our calculation we find that the quark mass dependence agrees with the prediction of lowest-order Chiral Perturbation Theory χPT for quark masses in the range of m ∼ m s/2 – 2 m s. We present the results of an analysis which assumes lowest-order χPT to be valid to extract the low-energy constants Σ and f P, as well as the strange quark mass. Non-perturbative renormalization is implemented via a matching procedure with data obtained using Wilson fermions in the Schrödinger functional set-up. We find that the scalar condensate computed here agrees with the one obtained previously through a finite-size scaling analysis.
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