Possible $\mathrm{\Sigma }({\frac{1}{2}}^{-})$ under the ${\mathrm{\Sigma }}^{\ast }(1385)$ peak in $K{\mathrm{\Sigma }}^{\ast }$ photoproduction

The LEPS collaboration has recently reported a measurement of the reaction $\gamma n\to K^{+}{\mathrm{\Sigma }}^{\ast -}(1385)$ with linearly polarized photon beam at resonance region. The observed beam asymmetry is sizably negative at $E_{\gamma }=1.8-2.4\mathrm{G}\mathrm{e}\mathrm{V}$, in contrast to the presented theoretical prediction. In this paper, we calculate this process in the framework of the effective Lagrangian approach. By including a newly proposed $\mathrm{\Sigma }(J^P={\frac{1}{2}}^{-})$ state with mass around 1380~MeV, the experimental data for both $\gamma n$ and $\gamma p$ experiments can be well reproduced. It is found that the $\mathrm{\Sigma }({\frac{1}{2}}^{-})$ and/or the contact term may play important role and deserve further investigation.