共振态复合系数与有效力程展开的研究  

Analysis on the composite nature of exotic state and its effective range expansion

作　　者：康现伟 于硕颖 汪泽强 KANG Xianwei;YU Shuoying;WANG Zeqiang(The Key Laboratory of Beam Technology of Ministry of Education,Collge of Nuclear Science and Technology,Beijing Normal University,100875,Beijing,China;The Institute of Radiation Technology,Beijing Academy of Science and Technology,00875,Bejing,China)

机构地区：[1]北京师范大学核科学与技术学院,射线束技术教育部重点实验室,北京100875 [2]北京市科学技术研究院,辐射技术研究所,北京100875

出　　处：《北京师范大学学报（自然科学版）》2022年第5期708-712,共5页Journal of Beijing Normal University(Natural Science)

基　　金：国家自然科学基金资助项目(11805012)。

摘　　要：通过复合系数方法探讨了强子内部组分的占比,结果表明共振态的复合系数可定量描述某些奇特强子态的内部结构;确定了基于总宽度和复合系数关系式、Flatté参数化的理论方法、近阈共振态的谱函数这3种不同方法;基于Flatté参数化的有效力程进行展开,探讨了奇特共振态相关的散射长度和有效力程,并以轻标量介子f(980)为例进行了相应的计算以及讨论分析.The proportion of internal components of hadrons is discussed by the composite coefficient method,and the results show that the composite coefficients of the resonance can quantitatively describe the internal structure of some exotic hadron states. Three different methods were determined,namely,the relationship between the total width and the composite coefficient,the theoretical method of Flatté parameterization,and the spectral function of the near-threshold resonance. Combining effective range expansion and Flatté parameterization,the scattering length and effective range related to the exotic resonance are discussed, and the corresponding calculation and discussion are carried out by taking the light scalar meson f0(980) as an example.

关 键 词：奇特强子态 复合系数 Flatté参数化 谱函数 有效力程展开 

分 类 号：O572.2[理学—粒子物理与原子核物理]