Light quarkonium and charmonium mass shifts in an unquenched quark model  

作　　者：Xiaoyun Chen Yue Tan 陈晓云;谭悦(College of Science,Jinling Institute of Technology,Nanjing 211169,China;Department of Physics,Yancheng Institute of Technology,Yancheng 224000,China)

机构地区：[1]College of Science,Jinling Institute of Technology,Nanjing 211169,China [2]Department of Physics,Yancheng Institute of Technology,Yancheng 224000,China

出　　处：《Chinese Physics C》2024年第9期96-106,共11页中国物理C（英文版）

基　　金：Supported by the National Natural Science Foundation of China(12205125,11847145,12205249,11865019);the Natural Science Foundation of Jiangsu Province,China(BK20221166)。

摘　　要：The unquenched quark model for the light quarkonium and charmonium states is explored in this study.The quark-pair creation operator in the^(3)P_(0) model,which combines the two-quark and four-quark components,is modified by considering the effects of the created quark pair's energy.Furthermore,the separation between the created quark pair and valence quark pair is modified.All the wave functions,including those for the mesons and the relative motion between two mesons,are obtained by solving the corresponding Schrodinger equation using the Gaussian expansion method.The aim of this study is to find a new set of parameters that can accurately describe the mass spectrum of low-lying light quarkonium and charmonium states.Moreover,certain exotic states,such as X(3872),can be described well in the unquenched quark model.

关 键 词：the unquenched quark model Gaussian expansion method light quarkonium and charmonium states 

分 类 号：O572.33[理学—粒子物理与原子核物理]