论文标题
伪级炭对通过Pomeron交换机制的相互作用
Pseudoscalar charmonium pair interactions via the Pomeron exchange mechanism
论文作者
论文摘要
Following the observation of the fully-heavy tetraquark candidates $X(6900)$ and possible $X(6300)$ in the di-$J/ψ$ spectrum by the LHCb Collaboration, we investigate the near-threshold dynamics of the pseudoscalar quarkonium pairs in a coupled-channel approach in the di-$η_c$ channel.我们表明，波美龙交换机制应该是接近阈值的夸克对相互作用的一般动力学。在di- $η_c$ channel中，涉及di- $η_c$，$η_c$ - $η_c（2s）$和di- $η_c（2s）$交互的耦合通道系统。他们通过Pomeron Exchange潜力在阈值附近的$ S $波浪交互可能会产生与Di-$ j/ψ$，$ j/ψ$ - $ψ$ - $ψ（2S）$和di- $ψ（2s）$ coupled通道相似的接近阈值共振极。有趣的是，我们在这里发现，杆位的位置更多地转移到了相应的阈值，结果与Di-$ j/ψ$频谱中看到的位置不同。考虑到在两个矢量和两个伪级重的夸克系统之间的过渡中抑制重夸克自旋的倒换，di-$η_c$ spectrum中的增强应与di-$ j/ψ$通道中看到的增强。 Di-$η_c$通道的实验研究对于解开完全重型的四夸克系统的性质应该很有用。
Following the observation of the fully-heavy tetraquark candidates $X(6900)$ and possible $X(6300)$ in the di-$J/ψ$ spectrum by the LHCb Collaboration, we investigate the near-threshold dynamics of the pseudoscalar quarkonium pairs in a coupled-channel approach in the di-$η_c$ channel. We show that the Pomeron exchange mechanism should be a general dynamics in the near-threshold heavy quarkonium pair interactions. In the di-$η_c$ channel, a coupled-channel system involving the di-$η_c$, $η_c$-$η_c(2S)$ and di-$η_c(2S)$ interactions can be established. Their $S$-wave interactions near threshold via the Pomeron exchange potential can produce near-threshold resonance poles similar to the di-$J/ψ$, $J/ψ$-$ψ(2S)$ and di-$ψ(2S)$ coupled channels. Interestingly, we find here that the pole positions are more shifted to the corresponding thresholds and turn out to be different from those seen in the di-$J/ψ$ spectrum. Taking into account the suppression of the heavy quark spin flips in the transitions between two vector and two pseudoscalar heavy quarkonium systems, the enhancements in the di-$η_c$ spectrum should be different from those seen in the di-$J/ψ$ channel. Experimental study of the di-$η_c$ channel should be useful for disentangling the nature of the fully-heavy tetraquark systems.
