First complete NNLO QCD correction to J/ψ → 3γ gives partial width 0.96 eV that aligns better with BESIII measurement.
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Complete Next-to-Next-to-Leading-Order QCD Correction to $J/\psi \to 3\gamma$ Decay
First complete NNLO QCD correction to J/ψ → 3γ gives partial width 0.96 eV that aligns better with BESIII measurement.