ξ(2.2): AΛΛ¯bound state rather than an orbitally excited quarkonium state

We point out that a certain state (e.g., ${}_{}{}^3{}_{}{}^{}\mathrm{P}_0^{}{}_{}{}^{}$) of ΛΛ¯ bound system is rather narrow and can be a good candidate of ξ(2.23). By using the quark-pair-creation model, we also study the decay widths of higher excited quarkonium states. We conclude that none of the quarkonium states is a likely candidate of ξ(2.23).