TY  - JOUR
AU  - Bernardoni, F.
AU  - Garron, N.
AU  - Hernandez, P.
AU  - Necco, S.
AU  - Pena, C.
PY  - 2011
DA  - 2011//
TI  - Probing the chiral regime of N-f=2 QCD with mixed actions
T2  - Phys. Rev. D
JO  - Physical Review D
SP  - 054503
EP  - 17pp
VL  - 83
IS  - 5
PB  - Amer Physical Soc
AB  - 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.
SN  - 1550-7998
UR  - http://arxiv.org/abs/arXiv:1008.1870
UR  - https://doi.org/10.1103/PhysRevD.83.054503
DO  - 10.1103/PhysRevD.83.054503
LA  - English
N1  - ISI:000288389300005
ID  - Bernardoni_etal2011
ER  -