Abstract
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 ${K}^{0}'\mathrm{s}$ 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.
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