论文标题
新发现的异国情调状态的可能结构$η_1（1855）$
Possible structure of the newly found exotic state $η_1(1855)$
论文作者
论文摘要
最近，在Besiii实验中观察到了一个名为$η_1（1855）$ $η_1（1855）$ 1.86 GEV的状态。由于其异国情调的量子号$ j^{pc} = 1^{ - +} $，这一发现具有特殊的兴趣。在本文中，我们在$ [1_c] _ {\ bar {s} s} \ otimes [1_c] _ {\ bar {q} q} Q} $ and和$ [1_c] _ {\ bar {s} q} \ otimes [1_c] _ {\ bar {s} q} $，并在QCD SUM规则的框架中执行质谱计算。结果表明，观察到的$η_1（1855）$可以嵌入到$ [1_c] _ {\ bar {s} s} \ otimes [1_c] _ {\ bar {q} q} $配置。分析了可能的四夸克和混合衰减模式，这对于解码其内部结构至关重要。以同样的方式，我们还评估了$ \ bar {s} s \ bar {s} s $分子状态，$ 1^{ - +} $量子数，发现可能存在两个这样的基础状态。
Recently, a hadronic state named $η_1(1855)$, about 1.86 GeV, was observed in the BESIII experiment. This finding has a peculiar interest due to its exotic quantum number $J^{PC}=1^{-+}$. In this paper, we examine the tetraquark interpretation for the structure of $η_1(1855)$ in the configurations of $[1_c]_{\bar{s}s}\otimes[1_c]_{\bar{q}q}$ and $[1_c]_{\bar{s}q}\otimes[1_c]_{\bar{s}q}$, and perform a mass spectrum calculation in the framework of QCD sum rules. The results show that the observed $η_1(1855)$ could be embedded into the $[1_c]_{\bar{s}s}\otimes[1_c]_{\bar{q}q}$ configuration. The possible tetraquark and hybrid decay modes are analyzed, which are critical in decoding its inner structure. In the same way, we evaluate as well the $\bar{s}s\bar{s}s$ molecular state with $1^{-+}$ quantum number and find that there might exist two such ground states.
