Search for the \(\boldsymbol{K^{+}\rightarrow}{\pi^{+}\pi^{0}\pi^{0}\gamma}\) Decay

Abstract

The \(K^{+}\to\pi^{+}\pi^{0}\pi^{0}\gamma\) decay is observed by the OKA collaboration. The branching ratio is measured to be \(\left(3.3\pm 0.8(\textrm{stat.})\right)\times 10^{-6}\). The branching ratio and \(\gamma\) energy spectrum are consistent with ChPT prediction.