Exploration of the hidden charm decays of Zcs (3985)

In the present work, we investigate the decays of Z(cs)(-) (3985) in the D-s(-) D*(0) + D-s*(-) D-0 molecular frame. By using an effective Lagrangian approach, the branching ratios of Z(cs)(-) -> J/psi K- and Z(cs)(-) -> eta K-c*(-) 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)(-) -> J/psi K- and Z(cs)(-) -> eta K-c*(-) are predicted to be an 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(-) -> K+K- J/psi around 4.68 GeV is (6.8(-6.2)(+10.5))%. All the predicted branching ratios in the present work could be tested by further measurements in BESIII and Belle II.

Automated summary

The study reveals that the main decay mode of Z(cs)(-) (3985) is open charm channel, while the branching ratio of hidden charm decay channels is around 20%, with the predicted branching ratios of Z(cs)(-) -> J/psi K- and Z(cs)(-) -> eta K-c*(-) expected to be around 10%.