@article{1587375,
abstract = {A new method to determine the low-energy couplings of the Delta S = 1 weak Hamiltonian is presented. It relies on a matching of the topological poles in 1/m(2) of three-point correlators of two pseudoscalar densities and a four-fermion operator, measured in lattice QCD, to the same observables computed in the is an element of-regime of chiral perturbation theory. We test this method in a theory with a light charm quark, i.e. with an SU(4) flavour symmetry. Quenched numerical measurements are performed in a 2 fm box, and chiral perturbation theory predictions are worked out up to next-to-leading order. The matching of the two sides allows to determine the weak low-energy couplings in the SU( 4) limit. We compare the results with a previous determination, based on three-point correlators containing two left-handed currents, and discuss the merits and drawbacks of the two procedures.},
author = {Hernandez, P. and Laine, Mikko and Pena, C. and Torro, E. and Wennekers, J. and Wittig, H.},
issn = {1029-8479},
journal = {Journal of High Energy Physics},
number = {05},
pages = {043},
title = {{Determination of the Delta S=1 weak Hamiltonian in the SU(4) chiral limit through topological zero-mode wave functions}},
doi = {10.1088/1126-6708/2008/05/043},
volume = {2008},
year = {2008},
}