论文标题
$ x（6900）$的性质及其生产机制在LHCB
Nature of $X(6900)$ and its production mechanism at LHCb
论文作者
论文摘要
我们表明，波美龙交换在矢量charmonium散射中起着独特的作用。这种机制可以为LHCB协作观察到的Di-$ j/ψ$频谱中的非平凡结构提供自然的解释。作为动态产生的共振杆的狭窄结构$ x（6900）$可能是由$ j/ψ$ - $ j/ψ$，$ j/ψ$ - $ $ - $ψ$ - $ψ（2s）$散射之间的Pomeron交换和耦合通道效应。还发现了Di-$ j/ψ$阈值附近的杆结构。同时，我们预测$ x（6900）$可以在$ j/ψ$ - $ψ（2s）$的能量谱系中产生明显的阈值增强，可以在LHCB搜索。
We show that the Pomeron exchanges play a unique role in vector charmonium scatterings. Such a mechanism can provide a natural explanation for the nontrivial structures in the di-$J/ψ$ spectrum observed by the LHCb Collaboration. The narrow structure $X(6900)$, as a dynamically generated resonance pole, can arise from the Pomeron exchanges and coupled-channel effects between the $J/ψ$-$J/ψ$, $J/ψ$-$ψ(2S)$ scatterings. A pole structure near the di-$J/ψ$ threshold is also found. Meanwhile, we predict that $X(6900)$ can produce significant threshold enhancement in the $J/ψ$-$ψ(2S)$ energy spectrum which can be searched for at LHCb.
