NAGIOS: RODERIC FUNCIONANDO

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

Repositori DSpace/Manakin

Valencià Castellano

Inici
Investigació
e-prints
22 - Física
Visualitza element

IMPORTANT: Aquest repositori està en una versió antiga des del 3/12/2023. La nova instal.lació está en https://roderic.uv.es/

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

Mostra el registre complet de l'element

Visualització (296.0Kb)

Giusti, L.; Hernández Gamazo, Pilar; Laine, Mikko; Weisz, P.; Wittig, Hartmut

Aquest document és un/a article, creat/da en: 2004

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.

Veure al catàleg Trobes