Abstract
We present the ingredients for determining K + → π +π 0 matrix elements via the combination of lattice QCD and chiral perturbation theory (χPT). By simulating these matrix elements at unphysical kinematics, it is possible to determine all the low-energy constants (LECs) for constructing the physical K + → π +π 0 amplitudes at nextto-leading order (NLO) in the chiral expansion. In this work, the one-loop chiral corrections are calculated for arbitrary meson four-momenta, in both χPT and quenched χPT (gχPT), and the finite-volume effects are studied.
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