Recently, a new hadronic structure at around 6.9 GeV was observed in an LHCb experiment. From its limited yet known decay mode, one could still determine that it contains at least four charm quarks and hence belongs to the category of exotic state. This finding indicates for the first time the tetracharm exotic states and is therefore quite importance. In this letter, we propose a nature hybrid interpretation for the structure of $X(6900)$, i.e. in ${[{\overline{3}}_c]}_{cc}\otimes {[8_c]}_G\otimes {[3_c]}_{\overline{c}\overline{c}}$ configuration with $J^{PC}=0^{++}$, and by using the QCD Sum Rule technique we performed mass spectrum calculation. The results showed that the observed $X(6900)$ could be a gluonic tetracharm state, and some other structures may exist, e.g., one around 7.2 GeV in the tetracharm hybrid configuration and with $J^{PC}=0^{-+}$. We also predict the tetrabottom hybrid states, leaving for future experiment.

最近，在LHCb实验中观察到大约6.9 GeV的新强电子结构。从其有限但已知的衰变模式，仍然可以确定它至少包含四个夸克，因此属于奇异状态。这一发现首次表明了四碳异国状态，因此非常重要。在这封信中，我们提出了一种自然混合解释，用于解释$X（6900）$，即 ${[{\overline{3}}_C]}_{CC}\otimes {[8_C]}_G\otimes {[3_C]}_{\overline{C}\overline{C}}$ 配置与 ${Ĵ}^{PC}=0^{++}$，并使用QCD和规则技术进行了质谱计算。结果表明，观察到$X（6900）$ 可能是胶凝四碳态，并且可能存在其他一些结构，例如，在四碳杂化构型中具有约7.2 GeV的结构，并且具有 ${Ĵ}^{PC}=0^{-+}$。我们还预测了四底混合态，留给以后的实验。