Can X(5568) be a tetraquark state?

作     者：王伟 朱瑞林 

作者机构：INPAC Shanghai Key Laboratory for Particle Physics and Cosmology Department of Physics and Astronomy Shanghai Jiao Tong University State Key Laboratory of Theoretical Physics Institute of Theoretical Physics Chinese Academy of Sciences 

出 版 物：《Chinese Physics C》 (中国物理C（英文版）)

年 卷 期：2016年第40卷第9期

页      面：15-19页

核心收录：

学科分类：02[经济学] 0709[理学-地质学] 07[理学] 070202[理学-粒子物理与原子核物理] 070103[理学-概率论与数理统计] 0202[经济学-应用经济学] 020208[经济学-统计学] 0708[理学-地球物理学] 0804[工学-仪器科学与技术] 0827[工学-核科学与技术] 0703[理学-化学] 0714[理学-统计学（可授理学、经济学学位）] 0704[理学-天文学] 0701[理学-数学] 0702[理学-物理学] 

基　　金：Supported by National Natural Science Foundation of China(11575110) Natural Science Foundation of Shanghai(15DZ2272100,15ZR1423100) China Postdoctoral Science Foundation Open Project Program of State Key Laboratory of Theoretical Physics,Institute of Theoretical Physics,Chinese Academy of Sciences,China(Y5KF111CJ1) Scientific Research Foundation for Returned Overseas Chinese Scholars,State Education Ministry 

主　　题：exotic state diquark tetraquark 

摘      要：Very recently, the D0 collaboration has reported the observation of a narrow structure, X（5568）, in the decay process X（5568）→ Bs^0π^±using the 10.4fb^-1 data of pp collision at √s= 1.96 TeV. This structure is of great interest since it is the first hadronic state with four different valence quark flavors, b, s, u, d. In this work,we investigate tetraquarks with four different quark flavors. Based on the diquark-antidiquark scheme, we study the spectroscopy of the tetraquarks with one heavy bottom/charm quark and three light quarks. We find that the lowest-lying S-wave state, a tetraquark with the flavor [su][bd] and the spin-parity J^P= 0^＋, is about 150 MeV higher than the X（5568）. Further detailed experimental and theoretical studies of the spectrum, production and decays of tetraquark states with four different flavors are vital to gain a better understanding of the nature and classification of hadron exotic states.