| 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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