Testing chiral effective theory with quenched lattice QCD

Details Testing chiral effective theory with quenched lattice QCD Testing chiral effective theory with quenched lattice QCD

2008-03-19

arxiv.org/abs/0803.2772v1

JHEP 0805:024,2008

Physics

High Energy Physics

High Energy Physics - Lattice

29 pages, 10 figures

Scientific paper

10.1088/1126-6708/2008/05/024

We investigate two-point correlation functions of left-handed currents computed in quenched lattice QCD with the Neuberger-Dirac operator. We consider two lattice spacings a~0.09,0.12 fm and two different lattice extents L~ 1.5, 2.0 fm; quark masses span both the p- and the epsilon-regimes. We compare the results with the predictions of quenched chiral perturbation theory, with the purpose of testing to what extent the effective theory reproduces quenched QCD at low energy. In the p-regime we test volume and quark mass dependence of the pseudoscalar decay constant and mass; in the epsilon-regime, we investigate volume and topology dependence of the correlators. While the leading order behaviour predicted by the effective theory is very well reproduced by the lattice data in the range of parameters that we explored, our numerical data are not precise enough to test next-to-leading order effects.

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