Exploration of the hidden charm decays of $Z_{cs}(3985)$

Abstract

In the present work, we investigate the decays of $Z_{cs}^{-}(3985)$ in the $D_s^{-}{D}^{\ast 0}+D_s^{\ast -}{D}^0$ molecular frame. By using an effective Lagrangian approach, the branching ratios of $Z_{cs}^{-}\to J/\psi K^{-}$ and $Z_{cs}^{-}\to {\eta }_c{K}^{\ast -}$ 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 $Z_{cs}^{-}\to J/\psi K^{-}$ and $Z_{cs}^{-}\to {\eta }_c{K}^{\ast -}$ 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 $\left(6.8_{-6.2}^{+10.5}\right)\%$. All the predicted branching ratios in the present work could be tested by further measurements in BESIII and Belle II.

Comments: 7 pages, 1 figure and 1 table. To be published in Physical Review D