Experimental limitation on the probability for the decay π0→ γ
Bolotov V. N., Gninenko S. N., Dzhilkibaev R. M., Isakov V. V., Klubakov Yu. M., Laptev V. D., Lobashev V. M., Marin V. N., Postoev V. E., Poblaguev A. A., Toropin A. N.
The use of the decay Κ -^π π° as a source of 7Г° mesons has led to a limitation on the branching ratio for the decay π°—>4γ: B.R.(ir°->4?0 < 1.6χ 10"6.