We present the first lattice calculation of the matrix element of the electromagnetic operator <pi0|Q+|K0>, where Q+ = (Q_d e/16 pi^2)* (\bar s_L sigma{mu,nu} F{mu,nu} d_R + \bar s_R sigma{mu,nu} F{mu,nu} d_L). This matrix element plays an important role, since it contributes to enhance the CP violating part of the K_L -> pi0 e+ e- amplitude in supersymmetric extensions of the Standard Model.
@article{arxiv.hep-ph/0010349,
title = {First Lattice Calculation of the Electromagnetic Operator Amplitude <pi0|Q+|K0>},
author = {D. Becirevic and V. Lubicz and G. Martinelli and F. Mescia},
journal= {arXiv preprint arXiv:hep-ph/0010349},
year = {2015}
}