论文标题
$ x（6900）$的Gluonic Tetracharm配置
Gluonic Tetracharm Configuration of $X(6900)$
论文作者
论文摘要
最近，在LHCB实验中观察到了一种新的HADRONEN结构，约为6.9美元的GEV。从其有限但已知的衰减模式中，仍然可以确定它至少包含四个魅力夸克，因此属于异国情调的类别。这一发现首次表明了四项式外来状态，因此非常重要。在这封信中，我们为$ x（6900）$的结构提出了一种自然混合解释，即$ [\ bar {3} _C] _ {c c} \ otimes [8_c] _ {g} _ {g} \ outimes [3_c] _ { $ j^{pc} = 0^{++} $，并且通过使用QCD总规则技术，我们执行了质谱计算。结果表明，观察到的$ x（6900）$可能是一种gluonic四臂状态，并且可能存在其他一些结构，例如，在Tetracharm Hybrid配置中，一个约为$ 7.2 $ GEV，并且具有$ J^{PC} = 0^{ - +} $。我们还预测了四元杂种状态，而将来进行了未来的实验。
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 $[\bar{3}_c]_{c c}\otimes[8_c]_{G}\otimes[3_c]_{\bar{c} \bar{c}}$ 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.
