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arXiv 2602.01759hep-phhep-exhep-latnucl-exnucl-th
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完全奇异四夸克和五夸克在左手夸克模型中的研究

Fully strange tetra- and penta-quarks in a chiral quark model

Zhejiang Normal University(浙江师范大学);Nanjing Normal University(南京师范大学);Universidad Pablo de Olavide(巴勃罗·德·奥拉维德大学)

Gang Yang, Jialun Ping, Jorge Segovia

AI总结:

该研究在左手夸克模型中系统研究了完全奇异四夸克和五夸克,发现X(2300)共振态并预测了多个奇异态。

摘要:

受最近报告的共振结构X(2300)的启发,一个强候选者为具有正宇称的完全奇异四夸克,我们在此采用左手夸克模型对完全奇异四夸克和五夸克系统进行了系统研究。利用高斯展开法(GEM)结合复缩放法(CSM),研究了ssss和sssss系统的低能S波构型。对于四夸克,所有可能的构型:介子-介子、双夸克-反双夸克以及K型结构,均以完整的颜色基态被纳入考虑;而对于五夸克则考虑了重子-介子和双夸克-双夸克-反夸克构型。在两个领域中均识别出若干弱束缚态和狭窄共振态。特别是,发现了一个紧凑的完全奇异四夸克态,其J^P=1^+,位于约2.3GeV处,为X(2300)共振提供了自然解释。此外,在四夸克的1.6-3.1GeV和五夸克的2.6-3.2GeV质量范围内,预测了具有主导隐藏色和K型成分的额外奇异态。通过其尺寸、磁矩和波函数组成分析这些态的内部结构,突显了通道耦合和奇异色构型的关键作用。最后,提出了有希望的两体强衰变通道,以促进未来实验搜索。

英文摘要:

Motivated by the recently reported resonant structure $X(2300)$, a strong candidate for a fully strange tetraquark with positive parity, we perform a systematic study of fully strange tetra- and penta-quark systems within a chiral quark model. Low-lying $S$-wave configurations of the $ss\bar s\bar s$ and $ssss\bar s$ systems are investigated using the Gaussian Expansion Method (GEM) combined with the Complex Scaling Method (CSM), which allows for a unified treatment of bound, resonant, and scattering states. For tetraquarks, all possible configurations: meson-meson, diquark-antidiquark, and K-type structures, with complete color bases, are incorporated, while baryon-meson and diquark-diquark-antiquark configurations are considered for pentaquarks. Several weakly bound states and narrow resonances are identified in both sectors. In particular, a compact fully strange tetraquark with $J^P=1^+$ is found near $2.3\,\text{GeV}$, providing a natural interpretation of the $X(2300)$ resonance. Additional exotic states with dominant hidden-color and K-type components are predicted in the mass ranges $1.6-3.1$ GeV for tetraquarks and $2.6-3.2$ GeV for pentaquarks. The internal structure of these states is analyzed through their sizes, magnetic moments, and wave-function compositions, highlighting the essential role of channel coupling and exotic color configurations. Finally, promising two-body strong decay channels are proposed to facilitate future experimental searches.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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