论文标题
$λ（1405）$的两极分化$γp\ rightarrow k^+πς$反应
Polarization of $Λ(1405)$ in the $γp \rightarrow K^+ πΣ$ reaction
论文作者
论文摘要
在本文中，我们研究了$γp\ rightarrow k^+πς$在有效的拉格朗日方法和isobar模型中反应的$λ（1405）$的两极分化。在我们的模型中，$λ（1405）$通过T渠道$ k/k^*$交换和U-channel Hyperon Exchange感到兴奋。与以前的研究相比，我们还包括一个接触术语的贡献，这对于我们的模型解释$λ（1405）$的极化是必不可少的。此外，我们还讨论了使用偏振数据验证$λ（1405）$的提议的两极结构的可能性。我们发现$λ（1405）$的两极分化或此反应中最终$σ$的极化对不变的质量$ m_ {πς} $敏感。因此，$λ（1405）$极化对$ m_ {πς} $的依赖性的测量可以提供有关$λ（1405）$的极点结构的有价值的信息。
In this paper, we study the polarization of the $Λ(1405)$ in the $γp \rightarrow K^+ πΣ$ reaction within an effective Lagrangian approach and isobar model. In our model, the $Λ(1405)$ is excited through the t-channel $K/K^*$ exchanges and u-channel hyperon exchange. Compared to previous studies, we also include the contribution from a contact term, which is necessary for our model to interpret the polarization of the $Λ(1405)$. In addition, we also discuss the possibility to verify the proposed two-pole structure of the $Λ(1405)$ using the polarization data. We find that the polarization of the $Λ(1405)$ or the polarization of the final $Σ$ in this reaction is sensitive to the invariant mass $M_{πΣ}$. Thus the measurement of the dependence of the $Λ(1405)$ polarization on the $M_{πΣ}$ can offer valuable information about the pole structure of the $Λ(1405)$.
