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.

Giusti, L., Hernandez, P., Necco, S., Pena, C., Wennekers, J., Wittig, H. (2008). Testing chiral effective theory with quenched lattice QCD. JOURNAL OF HIGH ENERGY PHYSICS, 2008(5) [10.1088/1126-6708/2008/05/024].

Testing chiral effective theory with quenched lattice QCD

GIUSTI, LEONARDO;
2008

Abstract

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.
Articolo in rivista - Articolo scientifico
QCD; Lattice Gauge theory
English
2008
2008
5
024
none
Giusti, L., Hernandez, P., Necco, S., Pena, C., Wennekers, J., Wittig, H. (2008). Testing chiral effective theory with quenched lattice QCD. JOURNAL OF HIGH ENERGY PHYSICS, 2008(5) [10.1088/1126-6708/2008/05/024].
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/12803
Citazioni
  • Scopus 10
  • ???jsp.display-item.citation.isi??? 10
Social impact