$χ^{\vphantom\dagger}_{c0}(3915)$作为LIQUID $c\bar c s \bar s$状态
$χ^{\vphantom\dagger}_{c0}(3915)$ As the Lightest $c\bar c s \bar s$ State
摘要：
状态$χ^{\vphantom\dagger}_{c0}(3915)$最近被粒子数据组从其先前的状态降级为常规的$c\bar c$ $2 {}^3P_0$状态，这主要是由于没有预期的$D\bar D$衰变。我们提出，$χ^{\vphantom\dagger}_{c0}(3915)$实际上是最轻的$c\bar c s \bar s$状态，并使用双夸克模型计算这种状态的光谱，确定许多观察到的粲鎓类状态，缺乏开放的魅力衰变模式为$c\bar c s \bar s$。在其他结果中，我们认为，$Y(4140)$是一个$J^{PC} = 1^{++}$ $c\bar c s \bar s$状态，在双光子聚变中没有看到，主要是由于朗道-杨定理。
英文摘要：
The state $χ^{\vphantom\dagger}_{c0}(3915)$ has recently been demoted by the Particle Data Group from its previous status as the conventional $c\bar c$ $2 {}^3P_0$ state, largely due to the absence of expected $D\bar D$ decays. We propose that $χ^{\vphantom\dagger}_{c0}(3915)$ is actually the lightest $c\bar c s \bar s$ state, and calculate the spectrum of such states using the diquark model, identifying many of the observed charmoniumlike states that lack open-charm decay modes as $c\bar c s \bar s$. Among other results, we argue that $Y(4140)$ is a $J^{PC} = 1^{++}$ $c\bar c s \bar s$ state that has been not been seen in two-photon fusion largely as a consequence of the Landau-Yang theorem.
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