arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2512.08643hep-ph
收藏

双底夸克五夸克态的光谱和衰变行为系统研究

Systematic investigation of the spectroscopy and decay behaviors of doubly-charmed pentaquarks

Tsinghua University(清华大学);Peking University(北京大学)

Hong-Tao An, Yu-Shuai Li

AI总结:

本研究通过构成夸克模型计算双底五夸克态的质量光谱及衰变特性,发现其紧凑结构和窄共振态,为未来理论和实验提供指导。

摘要:

在发现Ξ++ cc(3621)和T+ cc(3875)的基础上,我们对双底五夸克态的质量光谱、内部结构和衰变特性进行了全面研究。将两个轻夸克视为紧密结合的二夸克,五体系统可简化为四体重夸克-重夸克-二夸克-反夸克配置。在构成夸克模型框架内,我们利用高斯展开法计算了其质量光谱在4.7-5.4 GeV范围内的值及相应内部质量贡献。根均方半径通常在1.1-1.6 fm之间,表明紧凑的空间结构。此外,我们还通过夸克交换模型计算了重组衰变宽度,发现所有状态均不稳定,衰变为单底重子和单底介子。识别出若干窄共振态,其中一些总宽度甚至低于10 MeV。我们希望本研究能为未来理论研究和实验搜索双底五夸克态提供有价值的指导。

英文摘要:

Building upon the discoveries of the $Ξ^{++}_{cc}(3621)$ and $T^{+}_{cc}(3875)$, we undertake a comprehensive investigation into the mass spectra, internal structures, and decay properties of doubly-charmed pentaquarks. By treating the two light quarks as a tightly bound diquark, the five-body system reduces to a four-body heavy quark-heavy quark-diquark-antiquark configuration. Within the constituent quark model framework, we calculate their mass spectra in the range of 4.7-5.4 GeV and corresponding internal mass contributions via the Gaussian expansion method. The root-mean-square radii, typically between 1.1-1.6 fm, indicate compact spatial structures. Furthermore, we also calculate the rearrangement decay widths via the quark-interchange model, finding that all states are unstable and decay into a singly-charmed baryon and a singly-charmed meson. Several narrow resonances have been identified, some of which have a total width even below 10 MeV. We hope that our study could provide valuable guidance for future theoretical investigations and experimental searches targeting doubly-charmed pentaquarks.

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。

↑