AI 中文总结
本文通过最小FSI修饰极点框架比较$X(2356)$的重子偶素与末态相互作用解释，拟合BESIII谱发现能量依赖FSI最优，并指出极点位置对连续谱处理敏感。
AI 中文摘要
我们从近阈值动力学的角度重新审视了BESIII在$e^+e^-\to\Lambda\bar\Lambda\eta$中观测到的$X(2356)$增强结构。鉴于轻$\u039b\bar\Lambda$重子偶素存在的可能性，我们在最小FSI修饰极点框架内将该解释与末态相互作用（FSI）解释进行了比较。对数字化BESIII谱的纯FSI、类重子偶素极点和混合极点-连续谱三种情景的拟合表明，能量依赖的FSI描述在拟合质量与模型复杂度之间提供了最佳平衡。提取的极点位置强烈依赖于振幅参数化方式，这展示了重子偶素解释对连续谱处理方式的敏感性。我们讨论了衰变道、自旋观测量和伙伴态搜索如何为增强结构背后的动力学提供互补约束。
英文摘要
We revisit the $X(2356)$ enhancement observed by BESIII in $e^+e^-\toΛ\barΛη$ from the viewpoint of near-threshold dynamics. Motivated by the possibility of light $Λ\barΛ$ baryonium, we compare this interpretation with final-state-interaction (FSI) explanations within a minimal FSI-dressed pole framework. Fits of the pure-FSI, baryonium-like-pole, and mixed pole--continuum scenarios to the digitized BESIII spectrum identify the energy-dependent FSI description as providing the best balance between fit quality and model complexity. The extracted pole positions depend strongly on the amplitude parametrization, demonstrating the sensitivity of the baryonium interpretation to the treatment of the continuum. We discuss how decay channels, spin observables, and partner searches can provide complementary constraints on the dynamics underlying the enhancement.
Comments6 pages, to be published in Chinese Physics C
