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Implications of the Zcs(3985) and Zcs(4000) as two different states
Science Bulletin ( IF 18.9 ) Pub Date : 2021-06-29 , DOI: 10.1016/j.scib.2021.06.026
Lu Meng 1 , Bo Wang 2 , Guang-Juan Wang 3 , Shi-Lin Zhu 4
Affiliation  

Recently, the hidden charm tetraquark states Zcs(3985) and Zcs(4000) with strangeness were observed by the BESIII and LHCb collaborations, respectively, which are great breakthroughs for exploring exotic quantum chromodynamics (QCD) structures. The first and foremost question is whether they are the same state. In this work, we explore the implications of the narrower state Zcs(3985) in BESIII and the wider one Zcs(4000) in LHCb as two different states. Within a solvable nonrelativistic effective field theory, we include the possible violations of heavy quark spin symmetry and SU(3) flavor symmetry in a comprehensive approach. If Zcs(3985) and Zcs(4000) are two different states, our results show that Zcs(4000)/Zcs(3985) is the pure (|DsD+/-|DsD)/2 state, and the SU(3) flavor partner of Zc(3900) is Zcs(4000) rather than the Zcs(3985). Another two important consequences are the existence of a tensor DsD resonance with mass about 4126 MeV and width 13 MeV, and the suppression of the decay mode Zcs(3985)J/ψK. The two consequences can be tested in experiments and distinguish the two-state interpretation from the one-state scheme.



中文翻译:

Zcs(3985) 和 Zcs(4000) 作为两个不同状态的含义

最近,隐藏的魅力四夸克状态ZCS(3985)ZCS(4000)BESIII和LHCb合作分别观察到奇异现象,这是探索奇异量子色动力学(QCD)结构的重大突破。第一个也是最重要的问题是它们是否是同一个状态。在这项工作中,我们探索了更窄状态的含义ZCS(3985)在 BESIII 和更广泛的ZCS(4000)在 LHCb 中作为两个不同的状态。在可解的非相对论有效场论中,我们将可能违反重夸克自旋对称性和 SU(3) 味对称性的情况纳入综合方法。如果ZCS(3985)ZCS(4000)是两种不同的状态,我们的结果表明ZCS(4000)/ZCS(3985)是纯粹的(|+/-|)/2个状态,以及 SU(3) 风味伙伴ZC(3900)ZCS(4000)而不是ZCS(3985). 另外两个重要的结果是张量的存在与质量约 4126 MeV 和宽度 13 MeV 的共振,以及衰减模式的抑制ZCS(3985)/ψ. 这两个结果可以在实验中进行检验,并将两种状态的解释与一种状态的方案区分开来。

更新日期:2021-06-29
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