论文标题
测试$λ（1405）$ in $ k^{+}πς$ photoproduction $λ（1405）$的手性统一模型
Testing chiral unitary models for the $Λ(1405)$ in $K^{+}πΣ$ photoproduction
论文作者
论文摘要
我们采用一种新型的形式主义，用于对$γp\ to k^{+}πς$光增生反应的低能分析，以计算$λ（1405）$ resonance区域中$πς$不变的质量分布。该方法遵守了由单位性，规格不变性和手性扰动理论产生的约束，并且无需调整任何模型参数而使用。发现在最终状态下的梅森 - 巴里昂撤离对生成光谱的幅度和结构有重大影响，这些影响与CLAS协作的实验数据进行了比较。我们证明了理论预测对选择耦合通道$πς-\ bar {k} n $模型幅度的敏感性，这应该使人们能够约束这些模型的参数空间。
We adopt a novel formalism for the low-energy analysis of the $γp \to K^{+}πΣ$ photoproduction reaction to calculate the $πΣ$ invariant mass distributions in the $Λ(1405)$ resonance region. The approach adheres to constraints arising from unitarity, gauge invariance and chiral perturbation theory, and is used without adjusting any model parameters. It is found that the meson-baryon rescattering in the final state has a major impact on the magnitude and structure of the generated spectra that are compared with the experimental data from the CLAS collaboration. We demonstrate a large sensitivity of the theoretical predictions to the choice of the coupled-channel $πΣ- \bar{K}N$ model amplitudes which should enable one to constrain the parameter space of these models.
