$Z_c(4000)$ $D^* \bar D^*$状态的预测以及与要求保护的$Z_c(4025)$的关系
Prediction of a $Z_c(4000)$ $D^* \bar D^*$ state and relationship to the claimed $Z_c(4025)$
摘要：
在讨论了$D^* \bar D^*$与同位旋I=1相互作用中一个轻介子交换的OZI抑制后，我们研究了两个π介子交换对相互作用的贡献以及重矢量$J/ψ$的交换.我们发现后一种机制很弱，但足以勉强约束系统在J=2与质量约4000 MeV，而两个π交换的效果是一个净吸引力，但弱于从$J/ψ$交换。我们讨论这种状态，并试图将其与$Z_c(4025)$状态，以上的$D^* \bar D^*$阈值，声称在实验中在北京谱仪从和增强的$D^* \bar D^*$分布接近阈值。再加上最近对BES实验的重新分析结果表明，它与J=2状态在3990 MeV左右的阈值以下兼容，我们得出结论，BES实验可能表明我们在我们的方法中发现的状态存在。
英文摘要：
After discussing the OZI suppression of one light meson exchange in the interaction of $D^* \bar D^*$ with isospin I=1, we study the contribution of two pion exchange to the interaction and the exchange of a heavy vector $J/ψ$. We find this latter mechanism weak but enough to barely bind the system in J=2 with a mass around 4000 MeV, while the effect of the two pion exchange is a net attraction but weaker than that from $J/ψ$ exchange. We discuss this state and try to relate it to the $Z_c(4025)$ state, above the $D^* \bar D^*$ threshold, claimed in an experiment at BES from and enhancement of the $D^* \bar D^*$ distribution close to threshold. Together with the results from a recent reanalysis of the BES experiment showing that it is compatible with a J=2 state below threshold around 3990 MeV, we conclude that the BES experiment could be showing the existence of the state that we find in our approach.
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