First Lattice Calculation of the Electromagnetic Operator Amplitude <pi0|Q+|K0>
D. Becirevic, V. Lubicz, G. Martinelli, F. Mescia
Abstract
We present the first lattice calculation of the matrix element of the electromagnetic operator <pi0|Q+|K0>, where Q+ = (Qd e/16 pi2)* ( sL sigmamu,nu Fmu,nu dR + sR sigmamu,nu Fmu,nu dL). This matrix element plays an important role, since it contributes to enhance the CP violating part of the KL -> pi0 e+ e- amplitude in supersymmetric extensions of the Standard Model.
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