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Observation of J/psi --> 3 gamma

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We report the first observation of the decay J/psi --> 3 gamma. The signal has a statistical significance of 6 sigma and corresponds to a branching fraction of B(J/psi --> 3 gamma) = (1.2 +- 0.3 +- 0.2) x 10^-5, in which the errors are statistical and systematic, respectively. The measurement uses psi(2S) --> pi+ pi- J/psi events acquired with the CLEO-c detector operating at the CESR e+e- collider.

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  • Holographic quark masses and radiative decays of heavy vector mesons hep-ph · 2025-05-20 · conditional · none · ref 38 · internal anchor

    The authors extract charm and bottom constituent quark masses and several quarkonium decay widths from AdS/QCD plus the Segre formula, obtaining order-of-magnitude agreement with experiment but no precise match.