全重四夸克态T_(4c)的研究  

Research on full quadruple quark state T4c

作　　者：狄会翔 Di Huixiang(Southwest University,Chongqing 400715,China)

机构地区：[1]西南大学,重庆400715

出　　处：《现代盐化工》2022年第5期72-74,共3页Modern Salt and Chemical Industry

摘　　要：近年来,在LHCb实验的双J/ψ通道中发现的X(6 900)共振激发了人们对揭示全重四夸克态本质的浓厚兴趣。为了提出一个独立模型的理论框架,以研究这种新型奇异强子单举过程,即在大型强子对撞机碰撞实验中由4个重夸克(通常称为T_(4c))组成的共振,将四体问题分解为3个两体问题。自旋相关项(自旋、自旋轨道和张量)被用来描述T_(4c)的分裂结构,也被扩展到双夸克之间的相互作用。研究发现,S波T_(4c)的激发势可能低于其自发分离成粲夸克的阈值,而轨道和径向激发则高于相应的粲夸克阈值。最后,在不限制势能的情况下重复计算,得到束缚双夸克和束缚四夸克。这可能与夸克胶子等离子体中奇异的研究有关。这些状态的研究可以在LHC和Belle即将进行的实验中得到验证。In recent years, the X(6 900) resonance found in the double J/ψ channel of LHCb experiment has aroused people’s great interest in revealing the essence of full quadruple quark states. In order to propose a theoretical framework of an independent model to study the single-lift process of this new type of strange hadron, that is, the resonance composed of four heavy quarks (commonly known as T) in the collision experiment in the large hadron collider, the four-body problem is decomposed into three two-body problems. Spin-related terms(spin, spin orbit and tensor) are used to describe the splitting structure of T, which is also extended to the interaction between two quarks.It is found that the excitation potential of S-wave Tmay be lower than the threshold of its spontaneous separation into charm quarks,while the orbital and radial excitation is higher than the threshold of the corresponding charm quarks. Finally, the calculations are repeated without limiting the potential energy to obtain bound diquarks and bound quadruquarks. This may be related to the strange research in quark-gluon plasma. The research of these states can be veri?ed in the upcoming experiments of LHC and Belle.

关 键 词：全重四夸克态 非相对论量子色动力学 微扰矩阵元 相空间 粲夸克 

分 类 号：O572.33[理学—粒子物理与原子核物理]