Search for di-photon decays of an axion-like particle in radiative $J/\psi$ decays

Abstract

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.

9 pages, 5 figures, Published in Phys. Rev. D 110, L031101 (2024)

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• Layout optimization for the LUXE-NPOD experiment
• New Physics Searches via Beam Normal Spin Asymmetry in Bhabha Scattering
• Finding BSM Needles in Electromagnetic Haystacks at DUNE
• Search for Axion Like Particles produced via the Primakoff process at COMPASS