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Ablikim, M.; Adlarson, Patrik; Ikegami Andersson, Walter; Johansson, Tord; Kupsc, Andrzej; Pettersson, Joachim; Schönning, Karin; Thorén, Viktor; Wolke, Magnus; Zou, J. H.
Physical review. D, 04/2022, Volume: 105, Issue: 7Journal Article
Using a sample of (10.09±0.04)×10 9 J/ψ events collected with the BESIII detector, a partial wave analysis of J/ψ→γη′η′ is performed. The masses and widths of the observed resonances and their branching fractions are reported. The main contribution is from J/ψ→γf 0 (2020) with f 0 (2020)→η′η′, which is found with a significance of greater than 25σ. The product branching fraction B(J/ψ→γf 0 (2020))⋅B(f 0 (2020)→η′η′) is measured to be (2.63±0.06(stat.) +0.31 −0.46 (syst.))×10 −4 .
