Reanalysis of the Z_c(4020), Z_c(4025), Z(4050) and Z(4250) as Tetraquark States with QCD Sum Rules  

作　　者：王志刚 

机构地区：[1]Department of Physics,North China Electric Power University

出　　处：《Communications in Theoretical Physics》2015年第4期466-480,共15页理论物理通讯（英文版）

基　　金：Supported by National Natural Science Foundation of China under Grant No.11375063;Natural Science Foundation of Hebei Province under Grant No.A2014502017

摘　　要：In this article, we calculate the contributions of the vacuum condensates up to dimension-10 in the operator product expansion, and study the C γμ- Cγνtype scalar, axial-vector and tensor tetraquark states in details with the QCD sum rules. In calculations, we use the formula μ = √M^2X/ Y /Z-（2Mc）^2 to determine the energy scales of the QCD spectral densities. The predictions MJ =2=（4.02-0.09^＋0.09） GeV, MJ =1=（4.02-0.08^＋0.07） GeV favor assigning the Zc（4020） and Zc（4025） as the J^PC= 1^＋-or 2^＋＋diquark-antidiquark type tetraquark states, while the prediction MJ =0=（3.85-0.09^＋0.15） GeV disfavors assigning the Z（4050） and Z（4250） as the J^P C= 0^＋＋ diquark-antidiquark type tetraquark states. Furthermore, we discuss the strong decays of the 0^＋＋, 1^＋-, 2^＋＋diquark-antidiquark type tetraquark states in details.

关 键 词：tetraquark state QCD sum rules 

分 类 号：O572.33[理学—粒子物理与原子核物理]