Electromagnetic penguin operators and direct CP violation in K --> pi   l^+ l^-
  Supersymmetric extensions of the Standard Model predict a large enhancement of the Wilson coefficients of the dimension-five electromagnetic penguin operators affecting the direct CP violation in K_L --> pi^0 e^+ e^- and the charge asymmetry in K^\pm --> pi^\pm l^+ l^-.   Here we compute the relevant matrix elements in the chiral quark model and compare these with the ones given by lattice calculations 
Giancarlo D'Ambrosio and Dao-Neng Gao