Electromagnetic Interaction of the NeutralKMeson

The electromagnetic interaction of a spinless neutral particle, which is different from its antiparticle, is discussed. It is shown that while such particles cannot emit a free photon, or be scattered by an electromagnetic field, their extended charge distribution will undergo a contact interaction with charged particles. The case of the neutral $K$ meson ($K^0$) is considered as an example. The charge distribution arises from virtual dissociation into charged baryons. One contribution to the interaction is calculated. The interaction leads to a scattering of $K^0\text{'}\mathrm{s}$ by charged particles. The form of this scattering is quite similar to that of the nuclear scattering of the $K$ mesons, while its magnitude is much less, which implies that it will be difficult to detect. Possible other means of detecting the interaction are discussed.