出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We study the impact of explicit chiral symmetry breaking of lattice Wilson fermions on mesonic
correlators in the e-regime using Wilson chiral perturbation theory. We generalize the e-
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 aL2
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.
