申请人长期从事高能物理实验,研究曾参加北京谱仪II实验和德国ZEUS实验。在BESII实验发现X(1835)新粒子过程中做出了突出贡献，并获得国家自然科学二等奖(排名第三)；目前主要从事轻强子谱及新强子态寻找等研究工作，并取得许多重要成果。..本项目提出利用BESIII实验所获取的数据，系统研究轻介子衰变，分析它们的衰变特性，检验低能区强相互作用理论，解决轻介子研究领域一些长期悬而未决的问题，加深我们对轻介子结构的认识。对于赝标量介子，主要研究η/η′的达利兹图分析，η(1295)的存在与否和η(1405)的衰变性质等。对于矢量介子，主要研究 omega->3π中末态相互作用的贡献，检验色散理论，同时对omega 和rho的激发态进行研究；对于标量介子，深入开展a0(980)-f0(980)混合研究，提出两者之间是否混合的确切证据。

The project leader has much experience in the experimental particle physics. At BESII experiment, I made substantial contributions to search for the new forms of particles, in particular in the discovery of X(1835) particle. At the ZEUS experiment in Germany, I measured the charm fragmentation function in the photoproduction using the HERAI data and finished the Monte Carlo realization of the Calorimeter at the ZEUS detector. As the convener of the light hadron spectroscopy group, I am now is focusing on the study of light hadron spectroscopy at BESIII experiment. Many significant progresses on the search for new light hadrons and η/η′physics were achieved in recent years.. We made a survey on the current status of the pseudoscalar meson and vector meson and found that the further study on the light pseudoscalar and vector mesons are strongly needed. With the world’s largest data samples of J/psi and Psi(2S) collected at the BESIII detector, we propose to perform an extensive study on the light pseudoscalar and vector mesons, as well as their excited states, to study their decay dynamics, which provide much useful information to test the effective theory at the low energy region and hence to deepen our understanding on the structure of light hadrons and hadronic interactions. For study of the pseudoscalar mesons, we mainly focus on the Dalitz plot analysis ofη/η′decays, the extract of p-wave contribution in η′->3π, search forη(1295) in charmonium decays and study of η(1405) decay dynamics. While for the vector mesons, we first perform the Dalitz plot analysis of omega->3π to check the final state interaction contribution and to test the dispersive theory. With the Partial Wave Analysis (PWA), the decay of J/psi->omega ηπ will be analyzed to study the omega excited states, e.g., omega(1420) and omega(1650). In addition, we suggest to analyze J/psi-->pi+pi-pi0 to figure out the contribution from rho(770) excited states. At last we will investigate the a0(980)-f0(980) mixing by analyzing the decays of J/psi-->phi eta pi0 and Chi-c1--> pi+pi-pi0, and then provide the experimental proof on this issue.