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  • Study of e + e − → γϕJ/ψ from s $$ \sqrt{s} $$ = 4.600 to 4.951 GeV
    Q. An; K. Begzsuren; I. Boyko; G. F. Cao; G. Chelkov; H. S. Chen; T. Chen; W. S. Cheng; F. Cossio; A. Denig; M. Destefanis; Y. L. Fan; Y. Fang; F. Feldbauer; C. Geng; E. M. Gersabeck; L. M. Gu; X. Q. Hao; Y. K. Heng; C. Herold; G. S. Huang; K. X. Huang; Q. P. Ji; S. S. Jiang; S. Jin; Y. Jin; S. Kabana; I. K. Keshk; A. Kupsc; W. Kühn; J. S. Lange; L. Lavezzi; T. T. Lei; H. J. Li; L. J Li; S. X. Li; S. Y. Li; Xiaoyu Li; H. Liang; J. Libby; Feng Liu; Ke Liu; M. H. Liu; Z. A. Liu; X. L. Lu; Y. Lu; H. L. Ma; S. Maldaner; G. Mezzadri; T. J. Min; F. Nerling; Q. Ouyang; X. Pan; M. Pelizaeus; S. Plura; M. Qi; W. B. Qian; L. Q. Qin; K. J. Ren; A. Rivetti; V. Rodin; Ch. Rosner; K. Y. Shan; X. Y. Shan; L. G. Shao; X. Shi; S. Spataro; L. Sun; T. Sun; L. Y Tao; J. X. Teng; D. Y. Wang; L. L. Wang; X. F. Wang; Y. H. Wang; Yaqian Wang; F. Weidner; U. Wiedner; L. Wollenberg; Y. Wu; G. Y. Xiao; S. Y. Xiao; X. H. Xie; X. P. Xu; F. Yan; H. X. Yang; Y. F. Yang; Yifan Yang; T. Yu; A. Q. Zhang; H. H. Zhang; H. Q. Zhang; X. D. Zhang; Z. L. Zhang; Y. B. Zhao; B. Zheng; J. P. Zheng; X. Zhou; T. J. Zhu; Z. A. Zhu

    The journal of high energy physics, 01/2023, Letnik: 2023, Številka: 1
    Journal Article

    Abstract Using data samples with an integrated luminosity of 6.4 fb −1 collected by the BESIII detector operating at the BEPCII storage ring, the process of e + e − → γϕJ/ψ is studied. The processes of e + e − → ϕχ c1, c2, χ c1, c2 → γJ/ψ are observed with a significance of more than 10σ. The s $$ \sqrt{s} $$ -dependent cross section of e + e − → ϕχ c1, c2 is measured between 4.600 and 4.951 GeV, and evidence of a resonance structure is found for the first time in the ϕχ c2 process. We also search for the processes of e + e − → γX(4140), γX(4274) and γX(4500) via the γϕJ/ψ final state, but no obvious structures are found. The upper limits on the production cross section times the branching fraction for these processes at the 90% confidence level are reported.

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