Observation of J/psi --> 3 gamma

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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11 pages, available through http://www.lns.cornell.edu/public/CLNS/, submitted to PRL

12.38.Qk
13.20.Gd
electron positron: colliding beams
electron positron: annihilation
psi(3685): hadronic decay
J/psi(3100): radiative decay
photon: multiple production
final state: (3photon)
J/psi(3100): branching ratio
CLEO

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Figures(4)

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