Toward charged structure under a reflection mechanism

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

doi:10.1140/epjc/s10052-021-08877-4

2023 Impact factor 4.2

Particles and Fields

Open Access

Eur. Phys. J. C (2021) 81: 51
https://doi.org/10.1140/epjc/s10052-021-08877-4

Regular Article – Theoretical Physics

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

Jun-Zhang Wang¹^,2, Qin-Song Zhou¹^,2, Xiang Liu¹^,2^c and Takayuki Matsuki³

¹ School of Physical Science and Technology, Lanzhou University, 730000, Lanzhou, China
² Research Center for Hadron and CSR Physics, Lanzhou University and Institute of Modern Physics of CAS, 730000, Lanzhou, China
³ Tokyo Kasei University, 1-18-1 Kaga, 173-8602, Itabashi, Tokyo, Japan

^c xiangliu@lzu.edu.cn

Received: 12 December 2020
Accepted: 13 January 2021
Published online: 19 January 2021

Abstract

Very recently, the BESIII Collaboration reported a charged hidden-charm structure with strangeness in the recoil mass of $K^{+}$ $$K^+$$ of a process $e^{+} e^{-} \to D_{s}^{* -} D^{0} K^{+}$ $e^+e^-\rightarrow D_s^{*-}D^0K^+$ 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 $e^{+} e^{-} \to D^{* -} D^{0} π^{+}$ $e^+e^-\rightarrow D^{*-}D^0\pi ^+$ . 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 $\sqrt{s} = 4.628, 4.641, 4.661, 4.681, 4.698$ $\sqrt{s}=4.628, 4.641, 4.661, 4.681, 4.698$ GeV, we find that the $Z_{cs} (3985)$ $Z_{cs}(3985)$ can be explained as a reflection structure of charmed-strange meson $D_{s 2}^{*} (2573)$ $D_{s2}^{*}(2573)$ , 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 $e^{+} e^{-} \to D_{s}^{* -} D^{0} K^{+}$ $e^+e^-\rightarrow D_s^{*-}D^0K^+$ based on our proposed reaction mechanism, which may be an essential criterion to test the non-resonant nature of $Z_{cs} (3985)$ $Z_{cs}(3985)$ further.

© The Author(s) 2021

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