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  • Precision measurement of the branching fraction of \boldmath $J/\psi\rightarrow K^+K^-$ via $\psi(2S)\rightarrow \pi^+\pi^-J/\psi
    Ablikim, M; Achasov, M. N; An, M. R; Bertani, M; Bettoni, D; Briere, R. A; Chen, C; Chen, X. R; Chen, Y. B; Dai, J. P; Denysenko, I; De Mori, F; Ding, B; Ding, Y; Dong, L. Y; Du, M. C; Fang, S. S; Fang, Y. Q; Fava, L; Fischer, K; Garzia, I; Gong, L; Gramigna, S; Harris, F. A; Herold, C; Holtmann, T; Hou, G. Y; Hou, Y. R; Hou, Z. L; Hu, Y; Huang, K. X; Huang, Y. P; Irshad, M; Jiang, T. J; Jiao, Z; Kang, X. S; Larin, P; Lavezzi, L; Lellmann, M; Li, H; Li, Lei; Li, W. G; Li, X. H; Li, Z. X; Liang, Y. T; Limphirat, A; Liu, F. H; Liu, Feng; Liu, H. M; Liu, X; Liu, Y. B; Lou, X. C; Lu, H. J; Lu, Y; Luo, M. X; Luo, X. L; Ma, Y. M; Maas, F. E; Mao, Z. P; Mezzadri, G; Muchnoi, N. Yu; Niu, Y; Ouyang, Q; Qi, T. Y; Rolo, M; Schelhaas, Y; Shan, K. Y; Shan, W; Shen, X. Y; Shi, J. L; Shi, J. Y; Song, T. Z; Sun, K; Tao, Q. T; Wang, S. J; Wang, H. J; Wang, J. P; Wang, M; Wang, S; Wang, X. L; Wang, Z; Wu, C; Xiao, D; Xie, Y; Xu, C. F; Yan, X. Q; Yao, Z. P; Yu, J. S; Yuan, Y; Yue, C. X; Zeng, Y. J; Zhai, X. Y; Zhang, B. X; Zhang, J. J; Zhang, J. Y; Zhang, Y; Zhang, Z. L; Zheng, B; Zhu, L; Zu, J

    05/2024
    Journal Article

    Using a sample of $448.1 \times 10^6$ $\psi(2S)$ events collected with the BESIII detector, we perform a study of the decay $J/\psi\rightarrow K^+K^-$ via $\psi(2S)\rightarrow \pi^+\pi^-J/\psi$. The branching fraction of $J/\psi\rightarrow K^+K^-$ is determined to be $\mathcal{B}_{K^+K^-}=(3.072\pm 0.023({\rm stat.})\pm 0.050({\rm syst.}))\times 10^{-4}$, which is consistent with previous measurements but with significantly improved precision.

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