PossibleΣ(12−)under theΣ*(1385)peak inKΣ*photoproduction

Abstract

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