# Strange hadrocharmonium

## TL;DR

The paper discusses the hadrocharmonium model for charged charmoniumlike resonances and predicts the existence of strange counterparts, providing benchmarks for their experimental search in B_s meson decays.

## Contribution

It proposes the existence of strange hadrocharmonium states related to known resonances, extending the model and guiding future experimental searches.

## Key findings

- Predicted strange hadrocharmonium states $Z_{cs}$ decaying to $ ext{eta}_c K$ and $J/ ext{psi} K$.
- Set benchmarks for detecting these states in $B_s$ meson decays.
- Discussed properties and implications of these resonances.

## Abstract

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.