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VOLUME 62 (1995) | ISSUE 3 | PAGE 188
On the four-photon decay of the neutral pion
The dominant contribution to the π —>4γ branching ratio, coming from the purely electromagnetic photon-splitting graph, is calculated. The result fir(7r°—>4-y)~(2.6±0.1)· 10~u is about three orders of magnitude below the present experimental limit. © 1995 American Institute of Physics.