%0 Journal Article
%T Probing the chiral regime of N-f=2 QCD with mixed actions
%A Bernardoni, F.
%A Garron, N.
%A Hernandez, P.
%A Necco, S.
%A Pena, C.
%J Physical Review D
%D 2011
%V 83
%N 5
%I Amer Physical Soc
%@ 1550-7998
%G English
%F Bernardoni_etal2011
%O ISI:000288389300005
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=546), last updated on Mon, 11 Apr 2011 17:15:04 +0000
%X We report on our first experiences with a mixed action setup with overlap valence quarks and nonperturbatively O(a) improved Wilson sea quarks. For the latter we employ CLS N-f = 2 configurations with light sea-quark masses at small lattice spacings. Exact chiral symmetry allows to consider very light valence quarks and explore the matching to (partially-quenched) Chiral Perturbation Theory (ChPT) in a mixed epsilon/p-regime. We compute the topological susceptibility and the low-lying spectrum of the massless Neuberger-Dirac operator for three values of the sea-quark mass, and compare the sea-quark mass dependence to NLO ChPT in the mixed regime. This provides two different determinations of the chiral condensate, as well as information about some NLOlow-energy couplings. Our results allow to test the consistency of the mixed-regime approach to ChPT, as well as of the mixed action framework.
%R 10.1103/PhysRevD.83.054503
%U http://arxiv.org/abs/arXiv:1008.1870
%U https://doi.org/10.1103/PhysRevD.83.054503
%P 054503-17pp