Exploring the epsilon regime with lattice Wilson fermions

Abstract

We study the impact of explicit chiral symmetry breaking of lattice Wilson fermions on mesonic correlators in the epsilon-regime using Wilson chiral perturbation theory. We generalize the epsilon-expansion of continuum chiral perturbation theory to nonzero lattice spacing a and distinguish various regimes. It turnes out that lattice corrections are highly suppressed, as long as quark masses are of the order aΛ^2_QCD. The lattice spacing effects become more pronounced for smaller quark masses and may lead to non-trivial corrections of the continuum results at next-to-leading order. We compute these corrections for standard current and density correlation functions. A fit to lattice data shows that these corrections are small, as expected.

8 pages, 1 figure. Presented at the International Workshop on Effective Field Theories: from the pion to the upsilon, February 2-6 2009, Valencia, Spain

References in corpus (6)

• Lattice study of meson correlators in the epsilon-regime of two-flavor QCD
• Parameters of the lowest order chiral Lagrangian from fermion eigenvalues
• The epsilon regime with Wilson fermions
• Observations on the Wilson fermions in the epsilon regime
• Chiral low-energy constants from lattice QCD
• Wilson twisted mass fermions in the epsilon regime