Role of the f1(1285) state in the J/ψ→ϕK¯K⁎ and J/ψ → ϕf1(1285) decays

We study the role of the f1(1285)f1(1285) resonance in the decays of J/ψ→ϕK¯K⁎ and J/ψ→ϕf1(1285)J/ψ→ϕf1(1285). The theoretical approach is based on the results of chiral unitary theory where the f1(1285)f1(1285) resonance is dynamically generated from the K⁎K¯–c.c. interaction. In order to further test the dynamical nature of the f1(1285)f1(1285) state, we investigate the J/ψ→ϕK¯K⁎ decay close to the K¯K⁎ threshold and make predictions for the ratio of the invariant mass distributions of the J/ψ→ϕK¯K⁎ decay and the J/ψ→ϕf1(1285)J/ψ→ϕf1(1285) partial decay width with all the parameters of the mechanism fixed in previous studies. The results can be tested in future experiments and therefore offer new clues on the nature of the f1(1285)f1(1285) state.