论文标题
激动的$ξ$ baryons具有阈值效果的性质
Nature of excited $Ξ$ baryons with threshold effects
论文作者
论文摘要
最近的实验发展刺激了具有陌生性$ s = -2 $的激发重子的光谱。在这里，我们专注于$ξ（1620）$，该$位于$ \ bar {k}λ$阈值附近。为了考虑到阈值效应，我们构建了耦合通道介孔 - 巴里昂散射幅度，其中$ξ（1620）$作为共振出现。我们证明了$ \ bar {k}λ$阈值效果扭曲了$ξ（1620）$共振的峰值，从简单的Breit-wigner分布中。
Spectroscopy of excited baryons with strangeness $S=-2$ is stimulated by recent experimental developments. Here we focus on the $Ξ(1620)$ which locates close to the $\bar{K}Λ$ threshold. To take into account the threshold effects, we construct the coupled-channels meson-baryon scattering amplitude where the $Ξ(1620)$ appears as a resonance. We demonstrate that the $\bar{K}Λ$ threshold effects distort the peak of the $Ξ(1620)$ resonance from the simple Breit-Wigner distribution.
