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arXiv 2301.08615hep-phnucl-th
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Regge有效拉格朗日方法下最低 $Σ^*_{1/2^-}$ 态的光生过程

Photo-production of lowest $Σ^*_{1/2^-}$ state within the Regge-effective Lagrangian approach

Yun-He Lyu, Han Zhang, Neng-Chang Wei, Bai-Cian Ke, En Wang, Ju-Jun Xie

AI总结:

采用 Regge 有效拉格朗日方法研究最低 $Σ^*_{1/2^-}$ 重子态的光生反应,系统计入多道交换图与接触项贡献,预测 $γn\ o K^+Σ^{*-}_{1/2^-}$ 截面,为实验寻找该态提供理论依据。

摘要:

由于具有自旋宇称量子数 $J^{P}=1/2^{-}$ 的最低 $Σ^{*}$ 态在实验和理论上均远未确立,我们在 Regge 有效拉格朗日方法框架内对 $Σ^*_{1/2^-}$ 的光生过程进行了理论研究。考虑到 $Σ^*_{1/2^-}$ 与 $\ar{K}N$ 道耦合,我们计入了 $t$ 道 $K$ 交换图的贡献。此外,还考虑了 $t$ 道 $K^*$ 交换、$s$ 道核子极点、$u$ 道 $Σ$ 交换以及接触项的贡献。利用我们的模型参数预测了过程 $γn \ o K^{+}Σ^{*-}_{1/2^-}$ 的微分截面和总截面。该结果应有助于未来在实验上寻找 $Σ^*_{1/2^-}$ 态。

英文摘要:

Since the lowest $Σ^{*}$ state, with quantum numbers spin-parity $J^{P} =1/2^{-}$, is far from established experimentally and theoretically, we have performed a theoretical study on the $Σ^*_{1/2^-}$ photo-production within the Regge-effective Lagrangian approach. Taking into account that the $Σ^*_{1/2^-}$ couples to the $\bar{K}N$ channel, we have considered the contributions from the $t$-channel $K$ exchange diagram. Moreover, these contributions from $t$-channel $K^*$ exchange, $s$-channel nucleon pole, $u$-channel $Σ$ exchange, and the contact term, are considered. The differential and total cross sections of the process $γn \to K^{+}Σ^{*-}_{1/2^-}$ are predicted with our model parameters. The results should be helpful to search for the $Σ^*_{1/2^-}$ state experimentally in future.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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