Signature of an h1h1 state in the J/ψ→ηh1→ηK⁎0K¯⁎0 decay

The BES data on the J/ψ→ηK⁎0K¯⁎0 reaction show a clear enhancement in the K⁎0K¯⁎0 mass distribution close to the threshold of this channel. Such an enhancement is usually a signature of an L=0L=0 resonance around threshold, which in this case would correspond to an h1h1 state with quantum numbers IG(JPC)=0−(1+−)IG(JPC)=0−(1+−). A state around 1800MeV results from the interaction of the K⁎K¯⁎ using the local hidden gauge approach. We show that the peak observed in J/ψ→ηK⁎0K¯⁎0 naturally comes from the creation of this h1h1 state with mass and width around 1830MeV and 110MeV, respectively. A second analysis, model independent, corroborates the first result, confirming the relationship of the enhancement in the invariant mass spectrum with the h1h1 resonance.