Some remarks on compositeness of T_(cc)^(+)  

作　　者：陈畅 孟策 肖志广 郑汉青 Chang Chen;Ce Meng;Zhiguang Xiao;Han-Qing Zheng(Department of Physics,Peking University,Beijing 100871,China;College of Physics,Sichuan University,Chengdu 610065,China)

机构地区：[1]Department of Physics,Peking University,Beijing 100871,China [2]College of Physics,Sichuan University,Chengdu 610065,China

出　　处：《Chinese Physics C》2024年第4期51-58,共8页中国物理C（英文版）

基　　金：the National Nature Science Foundations of China(12335002,12375078,11975028);H.Q.Zheng and Z.Xiao are also Supported by"the Fundamental Research Funds for the Central Universities"。

摘　　要：Recently,the LHCb experimental group found an exotic state T_(cc)^(+) from the pp→D^(0)D^(0)π^(+)+X process.A key question is whether it is just a molecule or may have a confined tetraquark ingredient.To investigate this,different methods were used,including a two-channel(D^(∗)+D^(0) and D^(∗)0D^(+))K-matrix unitarization and a single-channel Flatté-like parametrization method analyzed utilizing the pole counting rule and spectral density function sum rule.These analyses demonstrated that T_(cc)^(+) is a molecular state,although the possibility that there may exist an elementary ingredient cannot be excluded,according to an approximate analysis of its production rate.

关 键 词：exotic mesons strong interaction hadron-hadron interactions scattering matrix bound state 

分 类 号：O572.33[理学—粒子物理与原子核物理]