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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 tr —* Ay branching ratio, coming from purely electromagnetic photon-splitting graph, is calculated. The result Br(ir° —· 47) ~ Cz (2.Ы0Л )-10*"lf is about three orders of magnitude below the present experimental limit.