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About the exotic structure of Zcs
Nuclear Physics B ( IF 2.5 ) Pub Date : 2021-05-25 , DOI: 10.1016/j.nuclphysb.2021.115450
Bing-Dong Wan , Cong-Feng Qiao

Very recently a new hadronic structure around 3.98 GeV was observed in BESIII experiment. From its decay modes, it is reasonable for people to assign it to the category of exotic state, say Zcs+, the stranged-parter of Zc(3900). This finding indicates for the first time the tetraquark with strange quark in hidden-charm sector, and hence has a peculiar importance. By virtue of the QCD Sum Rule technique, we analyze the Zcs+ about its possible configuration and physical properties, and find it could be configured as a mixture of two types of structures, [1c]c¯u[1c]s¯c and [1c]c¯c[1c]s¯u, or [3c]c¯u[3¯c]s¯c and [3c]c¯c[3¯c]s¯u, with JP=1+. Physically, it then appears to be the emergence of a compound of four possible currents in each configuration, which tells that the single current evaluation of hadron spectroscopy and their decay properties are sometimes not enough. We find that in both cases the energy spectra may fit well with the experimental observation within the uncertainties, i.e. 3.98 GeV, while be noted that the molecular state is not favored by vector-meson-exchange model. Various Zcs+(3980) decay modes are evaluated, which are critical for pinning down its configuration and left for experimental verification. We also predict the mass of Zcs0, the neutral partner of Zcs+(3980), and analyze its dominant decay probabilities.



中文翻译:

关于Z cs的奇异结构

最近,在BESIII实验中观察到了一种新的强电子结构,大约3.98 GeV。从衰变模式来看,人们合理地将其分配给异国状态类别,例如žCs+,是 žC3900。这一发现首次表明了在隐身扇中带有夸克的夸克四重夸克,因此具有特殊的重要性。借助QCD求和规则技术,我们分析了žCs+ 关于其可能的配置和物理属性,并发现它可以配置为两种类型的结构的混合物, [1个C]C¯ü[1个C]s¯C[1个C]C¯C[1个C]s¯ü, 或者 [3C]C¯ü[3¯C]s¯C[3C]C¯C[3¯C]s¯ü, 和 ĴP=1个+。从物理上讲,这似乎是在每种配置中出现了四种可能的电流的混合物,这表明强子光谱的单次电流评估及其衰减特性有时是不够的。我们发现,在两种情况下,能谱都可以在不确定性(即3.98 GeV)内与实验观察很好地吻合,但要注意,矢量介子交换模型不支持分子态。各种各样的žCs+3980评估衰减模式,这对于确定其配置至关重要,并留作实验验证。我们还预测了žCs0,中立的合作伙伴 žCs+3980,并分析其主要的衰变概率。

更新日期:2021-05-26
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