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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^-rightarrow 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^-rightarrow D^{*-}D^0pi ^+. In this work, we propose a reflection 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^-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) further.
Highlights
MeVntesryofreec+een−tly→, thDe Bs∗−EDSI0IIKC+oollrabDos−raDti∗o0nKre+leaats√edsm=ea4s.u6r8e1GeV, where a charged hidden-charm structure Zcs(3985)− was observed in the vicinity of the threshold of Ds∗− D0 (Ds− D∗0) [12]
The Lanzhou group proposed a new universal non-resonant explanation to Zc(3885) and Zc(4025) [17], whose line shapes on the respective invariant mass distribution are found to be well described by the reflection peak from the P-wave charmed meson D1(2420) as an intermediate resonance involved in a process e+e− → D(∗) D1(2420) → D(∗) D ∗π. If this reflection mechanism is really the key to the nature of charmoniumlike structures Zc(3885) and Zc(4025), we expect that it should play a crucial role in a process e+e− → Ds∗− D0 K + or Ds− D∗0 K +
Our results indicate that Zcs(3985)− can be naturally explained as a reflection structure from a charmed-strange meson Ds∗2(2573)
Summary
The D1(2420) will dominantly decay into D∗π and its contribution can cause a reflection peak near the threshold on the invariant mass spectrum of D D∗ in e+e− → D D ∗π , which can just explain a Zc(3885) structure [17]. Under some special kinematical behaviors, the intermediate resonance can show an obvious reflection peak near the threshold of invariant mass spectrum. There exists an obvious reflective peak near threshold in contribution involving the channel Ds∗− Ds∗2(2573)+. Only the reflection from charmed-strange meson Ds∗2(2573) and normal nonpeaking contributions are included where the overline above an amplitude stands for the average over spin of initial states and the sum over spin of final states, and the symbol star above physical quantities means that they tem.
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