关于建立轻$J^{P(C)}=1^{-(+)}$混合九元系的研究
Towards the establishment of the light $J^{P(C)}=1^{-(+)}$ hybrid nonet
摘要：
BESIII合作组对轻杂合候选体$η_1(1855)$的观测为我们进一步了解轻味区的奇异强子带来了巨大的机遇。我们发现，这一观察提供了一个关键的线索，建立$J^{P(C)}=1^{-(+)}$混合九。基于通量管模型，研究了$J/ψ$辐射衰变为两个赝标介子过程中$J^{P(C)}=1^{-(+)}$混合九态的产生和衰变机制。在$I=0$部分，我们发现SU（3）味八重态和单重态混合是不可忽略的，并且明显偏离了味理想混合。由于只有一个isoscope $η_1(1855)$的信号中观察到的$ηη'$通道，我们研究了两种方案的九态结构，其中$η_1(1855)$可以是较高或较低的质量状态，强烈耦合到$ηη'$。提出了检测多重态的可能途径。特别是对$J/ψ\to VH$（$V$和$H$分别代表光矢量介子和$1^{-(+)}$杂化态）中杂化产生的综合分析，可能会为这种九态结构提供进一步的证据，并最终在实验中确立这些神秘的外来物种。
英文摘要：
The observation of the light hybrid candidate $η_1(1855)$ by the BESIII Collaboration brings great opportunities for advancing our knowledges about exotic hadrons in the light flavor sector. We show that this observation provides a crucial clue for establishing the $J^{P(C)}=1^{-(+)}$ hybrid nonet. Based on the flux tube model picture, the production and decay mechanisms for the $J^{P(C)}=1^{-(+)}$ hybrid nonet in the $J/ψ$ radiative decays into two pseudoscalar mesons are investigated. In the $I=0$ sector, we find that the SU(3) flavor octet and singlet mixing is non-negligible and apparently deviates from the flavor ideal mixing. Since only signals for one isoscalar $η_1(1855)$ are observed in the $ηη'$ channel, we investigate two schemes of the nonet structure in which $η_1(1855)$ can be either the higher or lower mass state that strongly couples to $ηη'$. Possible channels for detecting the multiplets are suggested. In particular, a combined analysis of the hybrid production in $J/ψ\to VH$, where $V$ and $H$ stand for the light vector mesons and $1^{-(+)}$ hybrid states, may provide further evidence for this nonet structure and finally establish these mysterious exotic species in experiment.
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