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

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$D_s^{-}D^{0}K^+$,whichisnamedas$Z_{cs}(3985)^{-}$. The newly observed charged structure can be treated as a partner structure with strangeness of well-known $Z_c(3885{)}^{-}$ reported in a process $e^+e^-\to D^{-}D^0\pi^+$. 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,wefindthatthe$Z_{cs}(3985)$ can be explained as a reflection structure of charmed-strange meson $D_{s2}^{\ast }(2573)$, which is produced from the open-charm decay of $Y(4660)$ with a $D_s^{\ast }$ meson. Furthermore, we predicted the angular distribution of final state $D_s^{\ast -}$ in process $e^{+}{e}^{-}\to D_s^{\ast -}{D}^0{K}^{+}$ based on our proposed reaction mechanism, which may be an essential criterion to test the non-resonant nature of $Z_{cs}(3985)$ further.