Low-Energy Processγ+p→K++Σ0

Abstract

The reaction $\gamma +p\to {\Sigma }^{\circ }+K^{+}$ is discussed using the model developed in a previous paper. For odd-$K\Sigma$ parity the differential cross section can be accounted for by the one-nucleon pole term and the $K$ and $K^{*}$ exchange terms. With this model it is very difficult to fit the data for even-$K\Sigma$ parity. The coupling constant found for odd-$K\Sigma$ parity is $\frac{{g_{\Sigma \mathrm{NK}}}^2}{4\pi }\approx 4.5$, very close to the value $\frac{{g_{\Lambda \mathrm{NK}}}^2}{4\pi }\approx 4.0$ found in the previous paper.