赝标量介子谱的研究是完善强子谱学和寻找新型强子态的突破口之一，是对QCD理论的直接检验。实验上观测到赝标量粒子态的数目超出了夸克模型预期，深入研究各粒子态的性质以及它们间的关联性至关重要。eta(1405/1475)曾被认为是胶子球的最佳候选者之一，但随着研究的深入，其内部结构存在争议，甚至它是一个粒子态还是两个粒子态，都没有定论，需要深入研究。本项目将利用BESIII获取的100亿J/psi事例，通过J/psi辐射衰变到KKbar pi三个不同的同位旋末态，开展eta(1405/1475)内部结构和动力学机制的研究。同时，将与BESIII实验组其他成员及理论家合作，探索联合KKbar pi,3pi和eta pi pi不同末态的多道耦合的分波分析的技术和方法。研究结果将为解开‘eta(1405)/eta(1475)'之谜提供重要的实验信息，也将为多道耦合分波分析提供关键的实验工具。

The study of pseudoscalar meson spectrum is one of the breakthroughs to improve the understanding of hadron spectroscopy and search for new hadronic states. It is also a direct test of Quantum Chromodynamics (QCD) theory. At present, the number of psedoscalar particles observed in experiments exceeds the expectation of the quark model. It is very important to study the individually intrinsic constituents and their connectedness. The eta(1405/1475) has been considered to be one of the most interesting glueball candidates. However, with the in-depth research, it is still controversial about its internal constituents and properties, and is even far from conclusive whether they are two separated states or just one state in different decay modes. More precise and comprehensive studies are necessary. The J/psi radiative decays are of rich gluon, and are considered as the best platform to study hadron spectroscopy and search for glueballs. In this project, based on 10 billion J/psi events accumulated at BESIII detector, a partial-wave analysis (PWA) of the radiative J/psi decaying to KKbar pi will be performed, where the three combinations of KKbar pi with different isospin are included. The study is aimed to reveal the nature of eta(1405/1475) as well as the internal dynamic mechanism. Meanwhile, with the close cooperation with other researchers of BESIII experiment and relevant theorists, the feasibility of multi-channel coupling PWA for the KKbar pi, 3pi and eta pi pi final states will be explored. It is expected to provide the technology and method for multi-channel coupling PWA. The result will not only provide important experimental information and shed light on the disentangling of long-standing ‘eta(1405)/eta(1475) puzzle’, but also provide a key experimental tool for further research.