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arXiv 2011.08628hep-phhep-ex
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反射机制下的荷电$Z_{cs}(3985)$结构

Toward charged $Z_{cs}(3985)$ structure under a reflection mechanism

Jun-Zhang Wang, Qin-Song Zhou, Xiang Liu, Takayuki Matsuki

备注：
5 pages, 1 table and 3 figures
发表信息：
Eur. Phys. J. C 81 (2021) 51
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摘要：

最近，BESIII合作组报道了一种在过程$e^+e^-\to D_s^{*-}D^0K^+$或$D_s^{-}D^{*0}K^+$的$K^+$反冲质量中具有奇异性的带电隐魅结构，命名为$Z_{cs}(3985)^{-}$。新观察到的带电结构可以被视为具有在过程$e^+e^-\to D^{*-}D^0π^+$中报道的众所周知的$Z_{c}(3885)^{-}$的奇异性的伙伴结构。在这项工作中，我们提出了一个新的图片来理解$Z_{cs}(3985)$的性质。通过对$K^+$在$\sqrt{s}=4.628, 4.641, 4.661, 4.681, 4.698$ GeV五个能点上反冲质量分布的线形进行综合分析，发现$Z_{cs}(3985)$可以解释为$Y(4660)$与$D_s^*$介子开粲衰变产生的粲奇介子$D_{s2}^{*}(2573)$的反射结构.此外，基于我们提出的反应机理，我们预测了过程$e^+e^-\to D_s^{*-}D^0K^+$中终态$D_s^{*-}$的角分布，这可能是进一步检验$Z_{cs}(3985)$非共振性质的一个重要判据.

英文摘要：

Very recently, the BESIII collaboration reported a charged hidden-charm structure with strangeness in the recoil mass of $K^+$ of a process $e^+e^-\to D_s^{*-}D^0K^+$ or $D_s^{-}D^{*0}K^+$, which is named as $Z_{cs}(3985)^{-}$. The newly observed charged structure can be treated as a partner structure with strangeness of well-known $Z_{c}(3885)^{-}$ reported in a process $e^+e^-\to D^{*-}D^0π^+$. In this work, we propose a novel picture to understand the nature of $Z_{cs}(3985)$. By performing a combined analysis for the line shape of the recoil mass distribution of $K^+$ at five energy points $\sqrt{s}=4.628, 4.641, 4.661, 4.681, 4.698$ GeV, we find that the $Z_{cs}(3985)$ can be explained as a reflection structure of charmed-strange meson $D_{s2}^{*}(2573)$, which is produced from the open-charm decay of $Y(4660)$ with a $D_s^*$ meson. Furthermore, we predicted the angular distribution of final state $D_s^{*-}$ in process $e^+e^-\to D_s^{*-}D^0K^+$ based on our proposed reaction mechanism, which may be an essential criterion to test the non-resonant nature of $Z_{cs}(3985)$ further.

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