Article ; Online: Observation of J/ψ Electromagnetic Dalitz Decays to X(1835), X(2120), and X(2370).
2022 Volume 129, Issue 2, Page(s) 22002
Abstract: ... 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 ...
| Abstract | Using a sample of about 10^{10} J/ψ events collected at a center-of-mass energy sqrt[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. |
|---|---|
| Language | English |
| Publishing date | 2022-07-22 |
| Publishing country | United States |
| Document type | Journal Article |
| ZDB-ID | 208853-8 |
| ISSN | 1079-7114 ; 0031-9007 |
| ISSN (online) | 1079-7114 |
| ISSN | 0031-9007 |
| DOI | 10.1103/PhysRevLett.129.022002 |
| Database | MEDical Literature Analysis and Retrieval System OnLINE |
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