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

Abstract

The LEPS collaboration has recently reported a measurement of the reaction $\gamma n\to K^{+}{\Sigma }^{\ast -}(1385)$ with linearly polarized photon beam at resonance region. The observed beam asymmetry is sizably negative at $E_{\gamma }=1.8-2.4\mathrm{GeV}$, 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 $\Sigma (J^P={\frac{1}{2}}^{-})$ 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 $\Sigma ({\frac{1}{2}}^{-})$ and/or the contact term may play important role and deserve further investigation.

modified version to be published at Phys. Rev. C

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Cited by in corpus (36)

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• $\Sigma$ Resonances from $K^{-}N\to \pi \Lambda$ reactions with the center of mass energy from 1550 to 1676 MeV
• The $\Sigma$(1385) photoproduciton from proton within a Regge-plus-resonance approach
• Theoretical study of $N(1535)$ and ${\Sigma }^{\ast }(1/2^{-})$ in the Cabibbo-favored process ${\Lambda }_c^{+}\to p{\bar{K}}^0\eta$
• Analysis of the new Crystal Ball data on $K^{-}p\to {\pi }^0\Lambda$ reaction with beam momenta of $514\sim 750$ MeV/$c$
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• Observation of ${\Lambda }_c^{+}\to \Lambda a_0(980{)}^{+}$ and Evidence for $\Sigma (1380{)}^{+}$ in ${\Lambda }_c^{+}\to \Lambda {\pi }^{+}\eta$
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