Ablikim, M.Achasov, M. N.Ahmed, S.Albayrak, O.Albrecht, M.Alekseev, M.Ambrose, D. J.Lou, XinchouBESIII Collaboration2019-05-152019-05-152018-03-062470-0010https://hdl.handle.net/10735.1/6481The decay J/ψ → γγφ is studied using a sample of 1.31 x 10⁹ J/ψ events collected with the BESIII detector. Two structures around 1475 MeV/c² and 1835 MeV/c² are observed in the γφ invariant mass spectrum for the first time. With a fit on the γφ invariant mass, which takes into account the interference between the two structures, and a simple analysis of the angular distribution, the structure around 1475 MeV/c² is found to favor an assignment as the η(1475) and the mass and width for the structure around 1835 MeV/c² are consistent with the X(1835). The statistical significances of the two structures are 13.5σ and 6.3σ, respectively. The results indicate that both η(1475) and X(1835) contain a sizeable ss̅ component.enCC BY 4.0 (Attribution)©2017 The Authorshttp://creativecommons.org/licenses/by/4.0/GluonsJ/ψ (J/psi) mesonMesonsarticleAblikim, M., M. N. Achasov, S. Ahmed, O. Albayrak, et al. 2018. "Study of η(1475) and X(1835) in radiative J/Ψ decays to γφ." Physical Review D 97(5): 051101 1-8.975