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 (ChPT) for quark masses in the range of m ~ m_s/2-2m_s. We present the results of an analysis which assumes lowest-order ChPT to be valid to extract the low-energy constants Sigma 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 Schroedinger functional set-up. We find that the scalar condensate computed here agrees with the one obtained previously through a finite-size scaling analysis.
@article{arxiv.hep-lat/0110199,
title = {Scalar condensate and light quark masses from overlap fermions},
author = {Pilar Hernandez and Karl Jansen and Laurent Lellouch and Hartmut Wittig},
journal= {arXiv preprint arXiv:hep-lat/0110199},
year = {2015}
}