论文标题
$ z_ {cs}（3985）$和$ z_ {cs}（4000）$的方面
Aspects of $Z_{cs}(3985)$ and $Z_{cs}(4000)$
论文作者
论文摘要
在目前的工作中，我们研究了$η_ck $，$ j/ψk$，$η_ck^*$和$ j/ψk^*$ hidden-charm衰减模式的$ c \ bar {c} s \ bar {u} $四quark系统在分子和compactraquark senacearios中使用拼发的模型。我们的理论结果表明，如果新观察到的状态$ z_ {cs}（3985）$和$ z_ {cs}（4000）$是两个不同的状态，$ z_ {cs}（4000）$可以解释为混合物$ \ frac {1} {\ sqrt {2}}（d^0d_s^{* - * - }+d^{*0} d_s^{ - }）$，其中$ j/ψk$ partial衰减宽度为$γ\ sim2.89 $ mev，$ s y Mi Mi Mi Mi Mi Mi Mi Mim Mim Mim ass $ z_}（cys）（cys）（cys）（cys）（cys）（cys）（cys）（cys and and cys）（cys and and cys and cys}（385）（385） $ \ frac {1} {\ sqrt {2}}（ - d^0d_s^{* - }+d^{*0} d_s^{ - }）$，其中$ j/ψk$ partial衰减宽度为零至零。 Moreover, if the state $Z_{cs}(4000)$ can be explained as the mixed state $\frac{1}{\sqrt{2}}(D^0D_s^{*-}+D^{*0}D_s^{-})$ indeed, the partial decay width ratio between $J/ψK$ and $η_cK^*$ is close到单位，这表明衰减通道$η_ck^*$也可能是一个理想的通道，也可以解释$ z_ {cs}（4000）$的内部结构。此外，张量分子状态的部分衰减宽度$ | d^{*0} d_s^{* - } \ rangle_ {2^+} $衰减到$ j/ψk^*$中最多可以达到几个MEV，这表明这种张力的分子状态可以观察到这种良好的潜力。
In the present work we investigate the $η_c K$, $J/ψK$, $η_c K^*$ and $J/ψK^*$ hidden-charm decay modes for the $c\bar{c}s\bar{u}$ four-quark system in the molecular and compact tetraquark scenarios using the quark-exchange model. Our theoretical results indicate that if the newly observed states $Z_{cs}(3985)$ and $Z_{cs}(4000)$ are two different states, $Z_{cs}(4000)$ may be interpreted as the mixture $\frac{1}{\sqrt{2}}(D^0D_s^{*-}+D^{*0}D_s^{-})$ of which the $J/ψK$ partial decay width is about $Γ\sim2.89$ MeV, while $Z_{cs}(3985)$ may be explained as the mixture $\frac{1}{\sqrt{2}}(-D^0D_s^{*-}+D^{*0}D_s^{-})$ of which the $J/ψK$ partial decay width is small to zero. Moreover, if the state $Z_{cs}(4000)$ can be explained as the mixed state $\frac{1}{\sqrt{2}}(D^0D_s^{*-}+D^{*0}D_s^{-})$ indeed, the partial decay width ratio between $J/ψK$ and $η_cK^*$ is close to unit, which indicates the decay channel $η_cK^*$ may be a ideal channel as well to decode the inner structure of $Z_{cs}(4000)$. In addition, the partial decay width for the tensor molecular state $|D^{*0}D_s^{*-}\rangle_{2^+}$ decaying into $J/ψK^*$ can reach up to a few MeV, which shows this tensor molecular state has a good potential to be observed in this decay channel.
