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Supersymmetric extensions of the Standard Model predict a large enhancementof the Wilson coefficients of the dimension-five electromagnetic penguinoperators affecting the direct CP violation in K_L --> pi^0 e^+ e^- and thecharge asymmetry in K^\pm --> pi^\pm l^+ l^-.  Here we compute the relevant matrix elements in the chiral quark model andcompare these with the ones given by lattice calculationsComment: 12 pages, JHEP style, gluonic corrections to B_T adde

Electromagnetic penguin operators and direct CP violation inK→πell+ell−

Electromagnetic penguin operators and direct CP violation inK→πell⁺ell⁻