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          Institute: MPI für Physik     Collection: MPI für Physik     Display Documents



ID: 542970.0, MPI für Physik / MPI für Physik
Low-energy couplings of QCD from current correlators near the chiral limit
Authors:Giusti, L.; Hernandez, P.; Laine, M.; Weisz, P.; Wittig, H.
Date of Publication (YYYY-MM-DD):2004
Title of Journal:Journal of High Energy Physics
Journal Abbrev.:JHEP
Issue / Number:0404
Start Page:013
Audience:Not Specified
Intended Educational Use:No
Abstract / Description: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.
Classification / Thesaurus:Field Theory
Comment of the Author/Creator:20 pages, 5 figures
External Publication Status:published
Document Type:Article
Communicated by:N.N.
Affiliations:MPI für Physik
Identifiers:LOCALID:MPP-2004-6
URL:http://www.slac.stanford.edu/spires/find/hep/www?r...
URL:http://arXiv.org/abs/hep-lat/0402002
URL:http://publications.mppmu.mpg.de/?action=search&mp...
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