  In an experiment currently being performed at the Institute for High Energy
Physics, Serpukhov, Russia, a beam of charged kaons is directed on a copper
target. In the electromagnetic field of the target nuclei, two reactions occur:
$K^+ \gamma \to K^+ \pi^0$ and $K^+ \gamma \to K^0 \pi^+$. A peculiar
distinction between these two reactions is that there is a chiral anomaly
contribution in the former reaction, but not in the latter. This contribution
can be directly seen through comparison of the cross sections of these
reactions near the threshold. We derive expressions for these cross sections
taking into account the anomaly and the contribution of the lightest vector
mesons.
