Observation of $K^{+}\to {\pi }^{+}{\pi }^0{\pi }^0\gamma$ decay

The $K^{+}\to {\pi }^{+}{\pi }^0{\pi }^0\gamma$ decay is observed by the OKA collaboration. The branching ratio is measured to be $(4.1\pm 0.9(stat)\pm 0.4(syst))\times {10}^{-6}$. The branching ratio and $\gamma$ energy spectrum are consistent with ChPT prediction.