We present the status of a lattice calculation for the K-->pipi matrix elements of the (delta S=1) effective weak Hamiltonian, directly with two pion in the final state. We study the energy shift of two pion in a finite volume both in the I=0 and I=2 channels. We explain a method to avoid the Goldstone pole contamination in the computation of renormalization constants for (delta I=3/2) operators. Finally we show some preliminary results for the matrix elements of (delta I=1/2) operators. Our quenched simulation is done at beta=6.0, with Wilson fermions, on a (24^3 X 64) lattice.
@article{arxiv.hep-lat/0110169,
title = {Extraction of K-->pipi Matrix Elements with Wilson Fermions},
author = {Ph. Boucaud and V. Gimenez and C. J. D. Lin and V. Lubicz and G. Martinelli and M. Papinutto and F. Rapuano and C. T. Sachrajda and : and S. P. Qcd R. collaboration},
journal= {arXiv preprint arXiv:hep-lat/0110169},
year = {2012}
}