Predicition for the decay width of a charged state near the $D_s{\bar{D}}^{\ast }/D_s^{\ast }\bar{D}$ threshold

Abstract

Very recently it was predicted the existence of a charged state near the $D_s{\bar{D}}^{\ast }/D_s^{\ast }\bar{D}$ threshold. This state, that we call $Z_{cs}^{+}$, would be the strange partner of the recently observed $Z_c^{\pm }(3900)$. Using standard techniques of QCD sum rules, we evaluate the three-point function for the vertices $Z_{cs}^{+}J/\psi K^{+}$, $Z_{cs}^{+}{\eta }_c{K}^{\ast +}$ and $Z_{cs}^{+}{D}_s^{+}{\bar{D}}^{\ast 0}$ and we make predictions for the corresponding decay widths in these channels.

Comments: 9 pages, 6 figures