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arXiv 2109.02539hep-phhep-ex
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耦合道理论中$Y(4260)$的重夸克自旋伙伴

Heavy quark spin partners of the $Y(4260)$ in coupled-channel formalism

Muhammad Naeem Anwar, Yu Lu

摘要:

粲鎓类态$Y(4260)$主要被描述为耦合通道夸克模型中的$D_1 \bar{D}$分子[Phys.\,修订版\,D\,\textbf{96},\,114022\,(2017)].重夸克自旋对称性(HQSS)意味着在这些粲介子的阈值以下,可能出现分子构型为$D_1 \bar{D}^*$和$D_2^* \bar{D}^*$的重夸克自旋伙伴。我们分析了$J^{PC}=1^{--}$奇异态$Y(4360)$的各种中间粲介子环的几率,发现通道$D_1 \bar{D}^*$在其质量区附近耦合更强,即使$Y(4360)$的质量被推近$D_1 \bar{D}^*$阈值,耦合行为也保持不变.这启发了$Y(4360)$最有利的分子方案可能是$D_1 \bar{D}^*$,因此可以将其解释为$Y(4260)$的HQSS配偶体。我们还发现了$D_2^* \bar{D}^*$通道与$ψ(4415)$的强耦合行为,这使其成为优势$D_2^* \bar{D}^*$分子的良好候选者。我们讨论了这些共振的重要衰减模式,以解开它们的长距离和短距离结构。

英文摘要:

The charmoniumlike state $Y(4260)$ is described as predominantly a $D_1 \bar{D}$ molecule in a coupled-channel quark model [Phys.\,Rev.\,D\,\textbf{96},\,114022\,(2017)]. The heavy quark spin symmetry (HQSS) thus implies the possible emergence of its heavy quark spin partners with molecular configuration as $D_1 \bar{D}^*$ and $D_2^* \bar{D}^*$ below these charmed mesons' thresholds. We analyze the probabilities of various intermediate charmed meson loops for $J^{PC}=1^{--}$ exotic state $Y(4360)$ and find that the channel $D_1 \bar{D}^*$ couples more strongly around its mass regime, and the coupling behavior remains the same even if the mass of $Y(4360)$ is pushed closer to $D_1 \bar{D}^*$ threshold. This enlightens that the most favorable molecular scenario for the $Y(4360)$ could be $D_1 \bar{D}^*$, and hence it can be interpreted as HQSS partner of the $Y(4260)$. We also find the strong coupling behavior of $D_2^* \bar{D}^*$ channel with the $ψ(4415)$, which makes it a good candidate for a dominant $D_2^* \bar{D}^*$ molecule. We discuss the important decay patterns of these resonances to disentangle their long- and short-distance structures.

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