Observation of pseudoscalar and tensor resonances in J/ψ→γφφ
CitationKolcu, O. B., ... (2016). Observation of pseudoscalar and tensor resonances in J/ψ→γφφ. Physical Review D. 93.
Based on a sample of (1310.6±10.5)×106 J/ψ events collected with the BESIII detector operating at the BEPCII storage ring, a partial wave analysis of the decay J/ψ→γϕϕ is performed in order to study the intermediate states. Results of the partial wave analysis show that the structures are predominantly 0−+ states. The existence of the η(2225) is confirmed, and its resonance parameters are measured. Two additional pseudoscalar states, the η(2100) with a mass of 2050+30−24+75−26~MeV/c2 and a width of 250+36−30+181−164~MeV/c2 and the X(2500) with a mass of 2470+15−19+101−23~MeV/c2 and a width of 230+64−35+56−33~MeV/c2, are observed. In addition to these three pseudoscalar states, the scalar state f0(2100), and three tensor states, the f2(2010), f2(2300) and f2(2340), are observed in the process J/ψ→γϕϕ. The product branching fractions B(J/ψ→γX)×B(X→ϕϕ) are reported.