Systematical investigation on the stability of doubly heavy tetraquark states
Systematical investigation on the stability of doubly heavy tetraquark states
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双重四夸克态稳定性的系统研究
DOI：
10.1140/epja/s10050-019-00012-y
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发表时间：
2020
影响因子：
2.7
通讯作者：
Ping Jialun
中科院分区：
文献类型：
--
作者：
Deng Chengrong;Chen Hong;Ping Jialun
我们系统地研究了双重四夸克态 [Q1Q2][q over bar 3q over bar 4]（Q=c 和 b，q=u，d 和 s）在涉及多体限制势、西格玛交换、一胶子交换和一戈德斯通玻色子交换相互作用的替代色通量管模型框架内的稳定性。我们的数值分析表明状态 [bb][u over bar d over bar with 01+ 和 [bb][u over bar s over bar ] with 1+ 是对抗强相互作用最有希望的稳定状态。状态 [cc][u over bar d over bar ] 与 01+、[bc][u over bar d over bar ] 与 00+ 和 01+ 以及 [bb][u over bar d over bar ] 与 01- 作为稳定状态也在模型中预测。模型中讨论了产生四面体结构稳定状态的动力学机制。 IJP=12+ 的状态 [bb][u over bar d over bar ] 和 [bc][u over bar d over bar ] 将不稳定，尽管它们分别低于 B over bar *B over bar * 和 D*B over bar * 阈值，因为它们可以通过强相互作用衰减为 D 波 B over bar B over bar 和 DB over bar *。如果状态确实像我们的模型预测那样存在，那么它们应该具有较窄的宽度。
We systematically investigate the stability of the doubly heavy tetraquark states [Q1Q2][q over bar 3q over bar 4](Q=c and b, q=u, d and s) within the framework of the alternative color flux-tube model involving a multi-body confinement potential, sigma-exchange, one-gluon exchange and one-Goldstone-boson-exchange interactions. Our numerical analysis indicates that the states [bb][u over bar d over bar with 01+ and [bb][u over bar s over bar ] with 1+ are the most promising stable states against the strong interaction. The states [cc][u over bar d over bar ] with 01+, [bc][u over bar d over bar ] with 00+ and 01+, and [bb][u over bar d over bar ] with 01- as stable states are also predicted in the model. The dynamical mechanism producing those stable states with tetrahedral structure are discussed in the model. The states [bb][u over bar d over bar ] and [bc][u over bar d over bar ] with IJP=12+ would not be stable although they are, respectively, below the B over bar *B over bar * and D*B over bar * thresholds because they can decay into D-wave B over bar B over bar and DB over bar through the strong interaction. The states should have narrow widths if they really exist as our model prediction.