Could an axion-like particle be hidden in η_c→γγ?

2025/06/04 by Zhijun Li, Z. You, Li, Zhi-Jun +3
Physics and Astronomy · #Dark Matter and Cosmic Phenomena #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions

paper · pdf · doi:10.48550/arxiv.2506.04144

openalex publication_date 2025/06/04 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/04

Abstract

We discuss the possibility of an axion-like particle being merged in the recent observation of η_c → γγ at BESIII and find that it cannot be excluded in the current experimental data. The mass, width, and coupling strengths of the axion-like particle are extracted, and several other channels to confirm or exclude the existence of such an axion-like particle are also discussed.

Citations

• Constraints on axion-like particles using lattice QCD calculations of the rate for J/ψ→ γa
• Observation of the charmonium decay η_c→γγ in J/ψ→γη_c
• Electroweak Axion Portal to Dark Matter
• Axion-Like Particles in Radiative Quarkonia Decays
• Experimental Searches for the Axion and Axion-Like Particles
• Theory and phenomenology of two-Higgs-doublet models
• Review of Particle Physics

Related

• Constraints on axion-like particles with H.E.S.S. from observations of PKS 2155-304
• ALPs searches at BESIII
• Evidence for an axion-like particle from blazar spectra?
• Axion-like Particles from Primakov production in beam-dumps
• New Results In Axion Physics