重新评估J/ψ→γK_S^0K_S^0π^0过程中超出一维质量投影的X(2370)
Reassessing the $X(2370)$ in $J/ψ\toγK_S^0K_S^0π^0$ beyond the one-dimensional mass projections
- Cluster of Excellence “Color meets Flavor”, Universität Bonn（波恩大学“颜色相遇味道”卓越集群）
- Bethe Center for Theoretical Physics, Universität Bonn（波恩大学贝特理论物理中心）
- School of Computing, Data Sciences & Physics, College of William & Mary（威廉玛丽学院计算、数据科学与物理学院）
- Peng Huanwu Collaborative Center for Research and Education, International Institute for Interdisciplinary and Frontiers, Beihang University（北京航空航天大学前沿交叉学研究院彭桓武教学研究协同中心）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本研究采用有效耦合道框架重新评估J/ψ→γK_S^0K_S^0π^0过程中的X(2370)，发现无需额外X(2370)贡献，削弱了味单态论证，需更全面实验分析明确X(2370)性质。
AI中文摘要：
BESIII合作组近期通过对J/ψ→γK_S^0K_S^0π^0过程中一维K_S^0K_S^0π^0不变质量谱的拟合，提取了X(2370)的性质。质量关联中可见的中间两体结构，包括K_0^*(1430)带，要求在解释2.3 GeV附近的增强时，对跨道干涉进行相干处理。我们采用有效耦合道框架拟合已发表数据，重新评估是否需要额外的X(2370)贡献。三体母振幅通过K矩阵参数化为多个准两体道之间的散射。七裸态模型和八裸态模型给出相似的质量分布；添加第八个裸态使泊松偏差降低1.26%，并在E=(2424-i149) MeV处产生一个额外极点，其宽度远大于X(2370)的质量宽度参考值。该极点依赖于模型，其与X(2370)的对应关系尚不明确。本分析未确立J/ψ→γK_S^0K_S^0π^0过程中需要额外的X(2370)贡献，从而削弱了基于K^*K相对于总K\bar{K}π贡献的抑制作用提出的味单态论证。需开展更全面的实验振幅分析，纳入相关衰变道的相干干涉、质量与角关联及探测器效应，以确立X(2370)的作用及衰变性质。
英文摘要：
The BESIII Collaboration recently extracted the properties of the $X(2370)$ from a fit to the one-dimensional $K_S^0K_S^0π^0$ invariant-mass spectrum in $J/ψ\toγK_S^0K_S^0π^0$. The intermediate two-body structures visible in the mass correlations, including the $K_0^*(1430)$ bands, require a coherent treatment of cross-channel interference when interpreting the enhancement near 2.3 GeV. We reassess the need for an additional $X(2370)$ contribution by fitting the published data using an effective coupled-channel framework. The three-body parent amplitude is parameterized by a $K$-matrix as the scattering among several quasi-two-body channels. The seven- and eight-bare-state models give similar mass distributions. Adding the eighth bare state lowers the Poisson deviance by 1.26% and produces an additional pole at $E=(2424-i\,149)$ MeV, substantially broader than the $X(2370)$ mass-width reference. This pole is model-dependent, and its identification with the $X(2370)$ is not clear. The present analysis does not establish the need for an additional $X(2370)$ contribution in $J/ψ\toγK_S^0K_S^0π^0$, thereby weakening the flavor-singlet argument based on the suppression of $K^*\bar K$ relative to the total $K\bar Kπ$ contribution. A more comprehensive experimental amplitude analysis, incorporating coherent interference, mass and angular correlations, and detector effects across related decay channels, is needed to establish the role and decay properties of the $X(2370)$.
