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arXiv 1701.04524hep-ph
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具有超精细相互作用的粲重子和底重子的谱

Spectra of charmed and bottom baryons with hyperfine interaction

Zhen-Yang Wang, Ke-Wei Wei, Jing-Juan Qi, Xin-Heng Guo

摘要:

到目前为止,激发粲重子态和底重子态的理论和实验研究都还不够深入。在本文中,我们预言了$Ω_b^*$的质量为6069.2 MeV,它是唯一一个尚未观测到的$L = 0$重子态。分别在Goldstone玻色子交换(GBE)和单胶子交换(OGE)超精细相互作用模型中研究了具有轨道角动量$L = 1$的粲重子和底重子的能谱.插入“粒子物理评论”中的最新实验数据,我们发现在GBE模型中,存在一些三夸克最低能态自旋之和为3/2的多重态($Σ_{c(b)}$,$Ξ'_{c(b)}$和$Ω_{c(b)}$),而在OGE模型中则没有这种现象。这是GBE和OGE模型之间最重要的区别。这些结果可以在不久的将来得到检验。我们建议从理论和实验两个方面对激发态粲重子和底重子进行更多的研究,不仅是为了丰富重子谱,而且也是为了确定哪种超精细相互作用模型在自然界中得以实现。

英文摘要:

Up to now, the excited charmed and bottom baryon states are still not well studied both experimentally and theoretically. In the present paper, we predict the mass of $Ω_b^*$, the only $L = 0$ baryon state which has not been observed, to be 6069.2 MeV. The spectra of charmed and bottom baryons with the orbital angular momentum $L = 1$ are studied in two popular constituent quark models, the Goldstone boson exchange (GBE) and the one gluon exchange (OGE) hyperfine interaction models, respectively. Inserting the latest experimental data from the "Review of Particle Physics", we find that in the GBE model, there exist some multiplets ($Σ_{c(b)}$, $Ξ'_{c(b)}$ and $Ω_{c(b)}$) which total spins of three quarks in their lowest energy states are 3/2, but in the OGE model there is no such phenomenon. This is the most important difference between the GBE and OGE models. These results can be tested in the near future. We suggest more efforts to study the excited charmed and bottom baryons both theoretically and experimentally, not only for the abundance of baryon spectra, but also for determining which hyperfine interaction model is realized in nature.

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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