arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1911.02461hep-ph
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手征组分夸克模型中的$Y(4626)$

$Y(4626)$ in a chiral constituent quark model

Yue Tan, Jialun Ping

摘要:

最近,Belle合作组织报道了一个新的奇异态$Y(4620)$,其质量为4625.9 MeV。受实验的启发,我们在手征组分夸克模型的框架下,利用高斯展开方法研究了量子数为$J^{P}=1^{-}$的四夸克系统$c\bar{s}s\bar{c}$。两种结构,双夸克-反双夸克和介子-介子,考虑所有可能的颜色和自旋组态。结果表明,不能形成束缚态。为了研究可能的共振态,实标度法。提出了能量为4354、4408、4469、4497和4531 MeV的几个共振态。考虑到计算$q\bar{q}$介子的误差,计算四夸克系统的系统误差约为60 $\sim 100$ MeV。能量为4531 MeV的共振可能是新发现的态$Y(4620)$的候选态。

英文摘要:

Recently, Belle Collaboration reported a new exotic state $Y(4620)$ with mass at 4625.9 MeV in the positronium annihilation process. Inspired by experiment, we study the tetraquark system $c\bar{s}s\bar{c}$ with quantum numbers $J^{P}=1^{-}$ in the framework of chiral constituent quark model with the help of Gaussian expansion method. Two structures, diquark-antidiquark and meson-meson, with all possible color and spin configurations are considered. The result shows that no bound state can be formed. To investigate the possible resonance states, the real scaling method is employed. Several resonance states with energies 4354, 4408, 4469, 4497 and 4531 MeV, are proposed. Taking into account the errors in calculating the $q\bar{q}$ mesons, the system errors in the calculation of four-quark system are around 60$\sim 100$ MeV. The resonance with energy 4531 MeV is possible the candidate of the newly found state $Y(4620)$.

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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