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Low-energy coupling of QCD from current correlators near the chiral limit

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Low-energy coupling of QCD from current correlators near the chiral limit

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dc.contributor.author	Giusti, L.
dc.contributor.author	Hernández Gamazo, Pilar
dc.contributor.author	Laine, Mikko
dc.contributor.author	Weisz, P.
dc.contributor.author	Wittig, Hartmut
dc.date.accessioned	2015-04-23T11:51:41Z
dc.date.available	2015-04-23T11:51:41Z
dc.date.issued	2004
dc.identifier.citation	Giusti, L. Hernández Gamazo, Pilar Laine, Mikko Weisz, P. Wittig, Hartmut 2004 Low-energy coupling of QCD from current correlators near the chiral limit Journal of High Energy Physics 2004 04 13-1 13-22
dc.identifier.uri	http://hdl.handle.net/10550/43321
dc.description.abstract	We investigate a new numerical procedure to compute fermionic correlation functions at very small quark masses. Large statistical fluctuations, due to the presence of local ``bumps'' in the wave functions associated with the low-lying eigenmodes of the Dirac operator, are reduced by an exact low-mode averaging. To demonstrate the feasibility of the technique, we compute the two-point correlator of the left-handed vector current with Neuberger fermions in the quenched approximation, for lattices with a linear extent of L~1.5 fm, a lattice spacing a~0.09 fm, and quark masses down to the epsilon-regime. By matching the results with the corresponding (quenched) chiral perturbation theory expressions, an estimate of (quenched) low-energy constants can be obtained. We find agreement between the quenched values of F extrapolated from the p-regime and extracted in the epsilon-regime.
dc.language.iso	eng
dc.relation.ispartof	Journal of High Energy Physics, 2004, vol. 2004, num. 04, p. 13-1-13-22
dc.subject	Física
dc.title	Low-energy coupling of QCD from current correlators near the chiral limit
dc.type	journal article	es_ES
dc.date.updated	2015-04-23T11:51:41Z
dc.identifier.doi	10.1088/1126-6708/2004/04/013
dc.identifier.idgrec	015966
dc.rights.accessRights	open access	es_ES