  It has been recently suggested that the charged charmoniumlike resonances
$Z_c(4100)$ and $Z_c(4200)$ are two states of hadrocharmonium, related by the
charm quark spin symmetry in the same way as the lowest charmonium states
$\eta_c$ and $J/\psi$. It is pointed out here that in this picture one might
expect existence of their somewhat heavier strange counterparts, $Z_{cs}$,
decaying to $\eta_c K$ and $J/\psi K$. Some expected properties of such
charmoniumlike strange resonances are discussed that set benchmarks for their
search in the decays of the strange $B_s$ mesons.

High Energy Physics - Phenomenology;High Energy Physics - Experiment