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Observation of J/ψ Electromagnetic Dalitz Decays to X(1835), X(2120), and X(2370)
Observation of J/ψ Electromagnetic Dalitz Decays to X(1835), X(2120), and X(2370)
Using a sample of about 1010 J/ψ events collected at a center-of-mass energy s=3.097 GeV with the BESIII detector, the electromagnetic Dalitz decays J/ψ→e+e−π+π−η′, with η′→γπ+π− and η′→π+π−η, have been studied. The decay J/ψ→e+e−X(1835) is observed with a significance of 15σ, and also an e+e− invariant-mass dependent transition form factor of J/ψ→e+e−X(1835) is presented for the first time. The intermediate states X(2120) and X(2370) are also observed in the π+π−η′ invariant-mass spectrum with significances of 5.3σ and 7.3σ. The corresponding product branching fractions for J/ψ→e+e−X, X→π+π−η′ [X=X(1835), X(2120), and X(2370)] are reported.
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Using a sample of about 1010 J/ψ events collected at a center-of-mass energy s=3.097 GeV with the BESIII detector, the electromagnetic Dalitz decays J/ψ→e+e−π+π−η′, with η′→γπ+π− and η′→π+π−η, have been studied. The decay J/ψ→e+e−X(1835) is observed with a significance of 15σ, and also an e+e− invariant-mass dependent transition form factor of J/ψ→e+e−X(1835) is presented for the first time. The intermediate states X(2120) and X(2370) are also observed in the π+π−η′ invariant-mass spectrum with significances of 5.3σ and 7.3σ. The corresponding product branching fractions for J/ψ→e+e−X, X→π+π−η′ [X=X(1835), X(2120), and X(2370)] are reported.