CLEO Collaboration, G. S. Adams
Published 2008-06-04Version 1
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.
Comments: 11 pages, available through http://www.lns.cornell.edu/public/CLNS/, submitted to PRL
Journal: Phys.Rev.Lett.101:101801,2008
Search for the Decay J/psi -> gamma + invisible
First Observation of the Decay D_s^+ to proton anti-neutron
First Observation of the $Σ_{c}^{*+}$ Baryon and a New Measurement of the $Σ_{c}^{+}$ Mass
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