论文标题
$λ（1380）$，$λ（1405）$和$σ（1385）$的杆参数的新见解
New insights into the pole parameters of the $Λ(1380)$, the $Λ(1405)$ and the $Σ(1385)$
论文作者
论文摘要
耦合通道的S-和P波临近领先的手性手性独立方法$ s = -1 $ s = -1 $ Meson-Baryon散射，以包括Kloe和Amadeus实验的新数据以及$σ（1385）$的$λπ$质量分布。两极在第二个Riemann纸上的位置，对应于$σ（1385）$ POL和$λ（1380）$和$λ（1405）$ col，以及这些状态与各种渠道的耦合。我们发现，包括Kloe和Amadeus数据在内时，共振位置和分支比率平均要高约20 \％。此外，首次研究了极点参数之间的相关性，并证明是相关的。我们还发现，$σ（1385）$对$λ$状态的属性具有可忽略的影响。尽管如此，根据Belle协作的$π^\pmλ$线形状的新测量，我们在本解决方案中识别了ISOSPIN-1尖源结构。
A coupled-channel S- and P-wave next-to-leading order chiral-unitary approach for strangeness $S=-1$ meson-baryon scattering is extended to include the new data from the KLOE and AMADEUS experiments as well as the $Λπ$ mass distribution of the $Σ(1385)$. The positions of the poles on the second Riemann sheet corresponding to the $Σ(1385)$ pole and the $Λ(1380)$ and $Λ(1405)$ poles as well as the couplings of these states to various channels are calculated. We find that the resonance positions and branching ratios are on average determined with about 20\% higher precision when including the KLOE and AMADEUS data. Additionally, for the first time, the correlations between the parameters of the poles are investigated and shown to be relevant. We also find that the $Σ(1385)$ has negligible influence on the properties of the $Λ$ states given the available data. Still, we identify isospin-1 cusp structures in the present solution in light of new measurements of $π^\pmΛ$ line-shapes by the Belle collaboration.
