Electromagnetic Properties ofπandKMesons

A formalism is proposed which can give a smaller mass for the charged than for the neutral $K$ meson, but a larger mass for the charged than for the neutral $\pi$ meson. The theoretical prediction agrees with the experimental mass difference $M\left(K^0\right)-M\left(K^{+}\right)\approx 9.4$ electron masses if the rms radius of the charge distribution of the $K$ meson is equal to 0.48×${10}^{-13\mathrm{}}$ cm.