Observation of J/psi --> 3 gamma

Details Observation of J/psi --> 3 gamma Observation of J/psi --> 3 gamma

2008-06-04

arxiv.org/abs/0806.0671v1

Phys.Rev.Lett.101:101801,2008

Physics

High Energy Physics

High Energy Physics - Experiment

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

Scientific paper

10.1103/PhysRevLett.101.101801

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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