Mr Yiming Cai (University of Maryland, College Park)
A precise Standard Model prediction for the direct CP violation in the K -> \pi\pi decay process is of great importance in confronting experiments and constraining new physics. The state-of-art lattice QCD precision of this process will soon achieve a value for which QED effects can no longer be neglected. The inclusion of QED in such calculations is planned and the formalism to relate the finite-volume matrix element obtained from these calculations to the physical amplitude is underway. Here we present preliminary results on the extension of Lellouch-Luscher formula in presence of QED, therefore providing such formalism for the extraction of physical amplitudes for the K->\pi\pi process with charged initial and/or final states.