研究重子内部夸克－胶子结构，是目前人类探索物质微观结构的最前沿，是粒子物理和核物理学家共同关心的最基本问题之一。系统的研究各类重子谱将为我们了解禁闭区QCD本质提供极为重要的线索。然而，重子谱的实验数据很贫乏；即使是一些实验上确认得很好的态，理论模型的预言与实验不相符；理论预言的很多重子激发态至今未被发现。特别是含奇异夸克的重子激发态-超子激发态，其实验数据更是少之又少。因此，人们对重子结构的认识还很贫乏。粲偶素衰变为研究核子激发态和超子激发态提供了一个极佳的场所。本项目拟利用北京谱仪实验（BESIII）上获取的大统计量和高质量的 J/psi，psi'数据样本，研究超子激发态。对实验上已经发现的超子，测量其更多的衰变模式；寻找"失踪"的超子激发态，检验理论模型。通过上述实验研究，以期进一步丰富重子谱。

The understanding of the internal quark-gluon structure of baryons is one of the most important tasks in both particle and nuclear physics. From theoretical point of view, since baryons represent the simplest system in which the three colors of QCD neutralize into colorless objects and the essential non-Abelian character of QCD is manifest, the systematic study of various baryon spectroscopy will provide us with critical insights into the nature of QCD in the confinement domain. The main source of information for the baryon internal structure is their mass spectra, production and decay rates, etc. So far, the available experimental information is still poor, especially for the excited baryon states with strange quarks (hyperons), e.g., Lambda*,Sigma* and Cascade*, etc. Many excited baryons which are predicted by theories are not found experimentally. The charmonium decays provide us a good place for studying the excited nucleon N* and excited hyperons. We plan to search for the "missing" hyperons, measure the masses, widths, branching fractions and spin-parities of these hyperons by using partial wave analysis, based on the large J/psi and psi' data samples, accumulated at BESIII/BEPCII. With all the information, a deeper understanding of the baryon spectroscopy and a better understanding of the QCD can be achieved.