1302.5466 (Yun-Hua Chen et al.)

Possible $Σ^*(1/2^-)$ in initial-state polarized
$\gammaN\rightarrow K^{+} Σ^*(1385) \rightarrow K^{+} π
Λ$reaction near threshold    [PDF]

Yun-Hua Chen, Bing-Song Zou

By using effective Lagrangian method, we study the effects of a newly proposed $\Sigma^*(1/2^-)$ state with mass around 1380 MeV in initial-state polarized $\gamma N\rightarrow K^{+} \Sigma^*(1385) \rightarrow K^{+} \pi \Lambda$ process near threshold. The theoretical predictions for the helicity cross sections $\sigma_{3/2}$, $\sigma_{1/2}$ as well as their ratios, and the the angular distributions of $\pi$ in the $\pi\Lambda$ c.m. system are given. It is found that assuming $\Sigma^*(1/2^-)$ exists or not, these physical quantities are distinctly different. So our results could be useful for the investigation of the existence of $\Sigma^*(1/2^-)$ when the experimental data are available in the future.

View original: http://arxiv.org/abs/1302.5466