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

TL;DR

This paper proposes that the charged $Z_{cs}(3985)$ structure observed in experiments is a reflection of a charmed-strange meson, offering a new interpretation based on combined analysis of line shapes and decay mechanisms.

Contribution

It introduces a novel reflection mechanism explanation for $Z_{cs}(3985)$, linking it to $D_{s2}^{*}(2573)$ and $Y(4660)$ decays, and predicts angular distributions to test this hypothesis.

Findings

$Z_{cs}(3985)$ can be explained as a reflection of $D_{s2}^{*}(2573)$.

The mechanism involves $Y(4660)$ decay producing $D_s^*$ mesons.

Predicted angular distributions can test the non-resonant nature of $Z_{cs}(3985)$.

Abstract

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 $e^+e^-\to D^{*-}D^0\pi^+$. 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, 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.