论文标题
$ a_0（980）$，$λ（1670）$和$σ（1385）$的角色在$λ_c^+ \ toηλπ^+ $ decay中
Roles of $a_0(980)$, $Λ(1670)$, and $Σ(1385)$ in the $Λ_c^+ \to ηΛπ^+$ decay
论文作者
论文摘要
最近，Belle合作测量了$λ_C^+ \至ηλπ^+ $衰减，并报告了$ηλ$和$λπ^+ $不变的质量分布，该分别显示了共鸣$λ（1670）$和$σ（1385）$的清晰信号。根据我们以前的作品[欧洲。物理。 J. C 76（2016）496和Phys。 Rev. D 95（2017）074024]，我们通过考虑$ s $ -Wave $ηλ$和$ηπ^+$最终状态相互作用来重新分析此过程，该方法分别动态地产生了$λ（1670）$和$ a_0（980）$。我们的结果与Belle的测量值非常吻合，该测量支持$λ（1670）$和$ a_0（980）$的分子性质。此外，还计算了$ηπ^+$不变的质量分布，并且在$ k \ bar {k} $质量阈值周围显示了$ a_0（980）$的顺式结构。
Recently, the Belle Collaboration has measured the $Λ_c^+ \to ηΛπ^+$ decay and reported the $ηΛ$ and $Λπ^+ $ invariant mass distributions, which show the clear signals of the resonances $Λ(1670)$ and $Σ(1385)$, respectively. Based on our previous works [Eur. Phys. J. C 76 (2016) 496 and Phys. Rev. D 95 (2017) 074024], we re-analyze this process by considering the $S$-wave $ηΛ$ and $ηπ^+$ final state interactions within the chiral unitary approach, which dynamically generate the $Λ(1670)$ and $a_0(980)$, respectively. Our results are in good agreement with the Belle measurements, which supports the molecular nature of the $Λ(1670)$ and $a_0(980)$. In addition, the $ηπ^+$ invariant mass distributions are also computed and a cusp structure of $a_0(980)$ is cleary shown around the $K\bar{K}$ mass threshold.
