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The epsilon regime with Wilson fermions

AuthorsBar, O.; Necco, Silvia ; Schaefer, S.
KeywordsChiral Lagrangians
Lattice QCD
Issue Date2-Mar-2009
PublisherInstitute of Physics Publishing
CitationJHEP 0903:006,2009
AbstractWe study the impact of explicit chiral symmetry breaking of Wilson fermions on mesonic correlators in the is an element of-regime using Wilson chiral perturbation theory (WChPT). We generalize the is an element of-expansion of continuum ChPT to nonzero lattice spacings for various quark mass regimes. It turns out that the corrections due to a nonzero lattice spacing are highly suppressed for typical quark masses of the order a Lambda(2)(QCD). The lattice spacing effects become more pronounced for smaller quark masses and lead to non-trivial corrections of the continuum ChPT results at next-to-leading order. We compute these corrections for the standard current and density correlation functions. A fit to lattice data shows that these corrections are small, as expected.
Description31 pages, 2 figures.-- ISI Article Identifier: 000265600800006.-- Printed version published March 2009 .-- ArXiv pre-print avaible at: http://arxiv.org/abs/0812.2403
Publisher version (URL)http://dx.doi.org/10.1088/1126-6708/2009/03/006
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