A first-principles lattice QCD calculation gives Gamma(chi_c1 to J/psi gamma) = 0.3265(79) MeV and a2 = -0.0666(22), consistent with experiment and far more precise than prior lattice results.
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Lattice QCD study of the $\chi_{c1}\to J/\psi \, \gamma$ decay
A first-principles lattice QCD calculation gives Gamma(chi_c1 to J/psi gamma) = 0.3265(79) MeV and a2 = -0.0666(22), consistent with experiment and far more precise than prior lattice results.