关于$X(6900)$的几点注记
Some remarks on $X(6900)$
摘要：
使用动量依赖性Flatté样参数化对在di- $\jpsi$系统中发现的$X(6900)$上的LHCb数据进行分析。利用极点计数规则和谱密度函数求和规则给出了一致的结论，即如果只得到具有当前统计量的双$\jpsi$实验数据，则限制态和分子态都是可能的，否则无法区分$X(6900)$的性质。然而，我们发现，在双$J/ψ$系统中的最低态很可能具有与$X(6900)$相同的量子数，并且$X(6900)$可能不被解释为$J/ψ-ψ(2S)$分子态。
英文摘要：
The analysis of the LHCb data on $X(6900)$ found in the di-$\jpsi$ system is performed using a momentum-dependent Flatté-like parameterization. The use of the pole counting rule and spectral density function sum rule give consistent conclusions that both confining states and molecular states are possible, or it is unable to distinguish the nature of $X(6900)$, if only the di-$\jpsi$ experimental data with current statistics are available. Nevertheless, we found that the lowest state in the di-$J/ψ$ system has very likely the same quantum numbers as $X(6900)$, and $X(6900)$ is probably not interpreted as a $J/ψ-ψ(2S)$ molecular state.
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