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On the Four--Photon Decay of the Neutral Pion
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On the Four--Photon Decay of the Neutral Pion
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hep-ph
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gammabelowbranchingcalculatedcdotcomingcontributiondecay
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The dominant contribution to the $\pi^0 \to 4\gamma$ branching ratio, coming from purely electromagnetic photon-splitting graph, is calculated. The result $Br(\pi^0 \to 4\gamma) \simeq (2.6 \pm 0.1) \cdot 10^{-11}$ is about three orders of magnitude below the present experimental limit.
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