On the Four--Photon Decay of the Neutral Pion
E. L. Bratkovskaya, E. A. Kuraev, Z. K. Silagadze
Abstract
The dominant contribution to the π0 4γ branching ratio, coming from purely electromagnetic photon-splitting graph, is calculated. The result Br(π0 4γ) (2.6 0.1) · 10-11 is about three orders of magnitude below the present experimental limit.
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