
We compute the twopoint correlator between lefthanded flavour charges, and the threepoint correlator between two lefthanded charges and one strangeness violating \Delta I=3/2 weak operator, at nexttoleading order in finite volume SU(3)_L x SU(3)_R chiral perturbation theory, in the socalled epsilonregime. Matching these results with the corresponding lattice measurements would in principle allow to extract the pion decay constant F, and the effective chiral theory parameter g_27, which determines the \Delta I = 3/2 amplitude of the weak decays K to \pi\pi as well as the kaon mixing parameter B_K in the chiral limit. We repeat the calculations in the replica formulation of quenched chiral perturbation theory, finding only mild modifications. In particular, a properly chosen ratio of the threepoint and twopoint functions is shown to be identical in the full and quenched theories at this order.
