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

摘要

Very recently, the BESIII Collaboration reported a charged hidden-charm structure with strangeness in the recoil mass of $$K^+$$ K + of a process $$e^+e^-ightarrow D_s^{*-}D^0K^+$$ e + e - → D s ? - D 0 K + or $$D_s^{-}D^{*0}K^+$$ D s - D ? 0 K + , which is named as $$Z_{cs}(3985)^{-}$$ Z cs ( 3985 ) - . The newly observed charged structure can be treated as a partner structure with strangeness of well-known $$Z_{c}(3885)^{-}$$ Z c ( 3885 ) - reported in a process $$e^+e^-ightarrow D^{*-}D^0pi ^+$$ e + e - → D ? - D 0 π + . In this work, we propose a reflection picture to understand the nature of $$Z_{cs}(3985)$$ Z cs ( 3985 ) . By performing a combined analysis for the line shape of the recoil mass distribution of $$K^+$$ K + at five energy points $$sqrt{s}=4.628, 4.641, 4.661, 4.681, 4.698$$ s = 4.628 , 4.641 , 4.661 , 4.681 , 4.698 GeV, we find that the $$Z_{cs}(3985)$$ Z cs ( 3985 ) can be explained as a reflection structure of charmed-strange meson $$D_{s2}^{*}(2573)$$ D s 2 ? ( 2573 ) , which is produced from the open-charm decay of Y(4660) with a $$D_s^*$$ D s ? meson. Furthermore, we predicted the angular distribution of final state $$D_s^{*-}$$ D s ? - in process $$e^+e^-ightarrow D_s^{*-}D^0K^+$$ e + e - → D s ? - D 0 K + based on our proposed reaction mechanism, which may be an essential criterion to test the non-resonant nature of $$Z_{cs}(3985)$$ Z cs ( 3985 ) further.