Finding an h1(1830) state in J/ψ → ηh1 → ηK*0 K¯*0 BESII data

Abstract

A clear enhancement is seen in the BES data for the reaction J/ψ → ηK*0 K¯*0, close to the K* K¯* channel threshold. If it is produced by an S -wave resonance around threshold, it would correspond to an h1 state with quantum numbers IG (JPC) = 0− (1+−). Using the local hidden gauge approach, a state around 1800 MeV is generated from the interaction of the K* K¯*. The peak observed in J/ψ → ηK*0 K¯*0 is naturally explained by this h1 state, for which we determine a mass and width around 1830 MeV and 110 MeV, respectively. We corroborate this result with a second, model independent analysis.