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  • Search for di-photon decays of an axion-like particle in radiative $J/\psi$ decays
    Ablikim, M; Achasov, M. N; Bai, Y; Bertani, M; Bettoni, D; Bianchi, F; Bortone, A; Briere, R. A; Chen, C; Chen, X. R; Chen, Y. B; Dai, J. P; Denysenko, I; De Mori, F; Ding, Y; Dong, L. Y; Fang, S. S; Fang, Y. Q; Fava, L; Fischer, K; Garzia, I; Ge, Z. W; Gong, L; Harris, F. A; Herold, C; Holtmann, T; Hou, G. Y; Hou, Y. R; Hou, Z. L; Hu, Y; Huang, K. X; Huang, Y. P; Jiang, T. J; Jiao, Z; Kang, X. S; Kumar, N; Lei, Z. H; Lellmann, M; Li, Lei; Li, W. G; Li, X. H; Li, Z. X; Liang, Y. T; Limphirat, A; Liu, F. H; Liu, Feng; Liu, X; Liu, Y. B; Lou, X. C; Lu, H. J; Lu, Y; Luo, M. X; Luo, X. L; Mangoni, A; Mao, Z. P; Marcello, S; Min, T. J; Muskalla, J; Olsen, S. L; Pacetti, S; Qiu, J. F; Redmer, C. F; Ren, K. J; Rolo, M; Rosner, Ch; Salone, N; Shi, H; Sosio, S; Spataro, S; Sun, J. F; Sun, Y. Z; Tat, M; Wang, S. J; Wang, Bo; Wang, S; Wang, X. J; Wu, C; Xie, Y; Xu, C. F; Xu, Q. N; Yan, W. C; Yang, H. X; Yang, Y; Yang, Y. F; Yang, Y. X; Yao, Z. P; Yu, X. D; Yuan, L; Zhan, Y. H; Zhang, H; Zhang, Jianyu; Zhang, Y; Zhang, Z. L; Zhao, J. Y; Zhao, L; Zhao, Y. B; Zhou, L. P; Zhou, S; Zhu, L; Zhu, Y. C

    04/2024
    Journal Article

    We search for the di-photon decay of a light pseudoscalar axion-like particle, $a$, in radiative $J/\psi$ decays, using 10 billion $J/\psi$ events collected with the BESIII detector. We find no evidence of a signal and set upper limits at the $95\%$ confidence level on the product branching fraction $\mathcal{B}(J/\psi \to \gamma a) \times \mathcal{B}(a \to \gamma \gamma)$ and the axion-like particle photon coupling constant $g_{a \gamma \gamma}$ in the ranges of $(3.7-48.5) \times 10^{-8}$ and $(2.2 -101.8)\times 10^{-4}$ GeV$^{-1}$, respectively, for $0.18 \le m_a \le 2.85$ GeV/$c^2$. These are the most stringent limits to date in this mass region.

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