Photoproduction ofKMesons at Low Energy

Photoproduction of $K$ mesons is considered at low energy so that only $s$ and $p$ waves are important. The contribution of Born terms, $K^{*}$ meson, and $N^{*}$ resonance is calculated to the reaction $\gamma +N\to K+Y$. The values of unknown parameters such as hyperon magnetic moments and relative strengths and signs of $g_{\mathrm{KN}\Lambda }$, $g_{\mathrm{KN}\Sigma }$, $g_{K^{*}N\Lambda }$, and $g_{K^{*}N\Sigma }$ coupling constants as given by the octet model of unitary symmetry, are used. A reasonable fit to the experimental data on angular distributions for the reactions $\gamma +p\to K^{+}+{\Lambda }^0$ and $\gamma +p\to K^{+}+{\Sigma }^0$ is obtained in this model. In our model odd $K\Lambda$ and even $\Lambda \Sigma$ parities are implied. Thus the difference in the angular distribution of $K^{+}{\Lambda }^0$ and $K^{+}{\Sigma }^0$ production can be explained for even $\Lambda \Sigma$ parity. Certain predictions for other reactions have been obtained which can be tested experimentally when the data on these reactions will be available.