Abstract
In the present work, we investigate the decays of $Z^-_{cs}(3985)$ in the $D_s^{-} D^{\ast0} + D_s^{\ast -}D^0$ molecular frame. By using an effective Lagrangian approach, the branching ratios of $Z^-_{cs}\rightarrow J/\psi K^-$ and $Z^-_{cs}\rightarrow \eta_c K^{\ast-}$ are estimated. It is found that the dominating decay mode of $Z^-_{cs}(3985)$ is open charm channel, while, the branching ratio of the hidden charm decay channels is about $20\%$. In particular, the branching ratios of $Z^-_{cs}\rightarrow J/\psi K^-$ and $Z^-_{cs}\rightarrow \eta_c K^{\ast-}$ are predicted to be of order of $10\%$. Moreover, our estimation indicates that the fraction of the quasi-two-body cascade decay via $Z_{cs}(3985)$ and the total cross section of $e^+ e^- \to K^+ K^- J/\psi$ around 4.68 GeV is $\left(6.8^{+10.5}_{-6.2} \right)\%$. All the predicted branching ratios in the present work could be tested by further measurements in BESIII and Belle II.
Highlights
It is found that the dominating decay mode of Z−csð3985Þ is open charm channel, while, the branching ratio of the hidden charm decay channels is about 20%
In the past two decades, the study of exotic hadron states has been a topic of special interest in hadron physics (For recent reviews, we refer to Refs. [1,2,3,4,5,6,7,8,9,10,11].)
The first charged charmoniumlike states Z−c ð4430Þ were observed in the π−ψð2SÞ mass spectrum of B → Kπ−ψð2SÞ decays by the Belle collaboration in 2007 [12,13,14], and confirmed by the LHCb collaboration with the same process in the year 2014 [15]
Summary
In the past two decades, the study of exotic hadron states has been a topic of special interest in hadron physics (For recent reviews, we refer to Refs. [1,2,3,4,5,6,7,8,9,10,11].). ZÆc ð4020Þ was observed by the BESIII collaboration in eþe− → πþπ−hc [22] These two charged charmoniumlike states have been observed in the open charm processes [23,24] and ηcρ channel [25]. The experimental breakthrough of observing hidden charm and open strange states appeared when the BESIII collaboration reported a structure, named Z−csð3985Þ, in the Kþ recoil-mass KþðD−s DÃ0 þ DÃs−D0Þ at spectrum of process eþpe−ffiffi the center-of-mass energy s. We expand our investigations of the hidden charm decay of Zcð3900Þ to its strange partner Zcsð3985Þ with an effective Lagrangian approach, where Zcsð3985Þ is assumed to be a S-wave DÃsD 0=DsD Ã molecule state with.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
