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Artamonov, A. V.; Bychkov, V. N.; Donskov, S. V.; Filin, A. P.; Filippov, S. N.; Gorin, A. M.; Gushchin, E. N.; Inyakin, A. V.; Kekelidze, G. D.; Khaustov, G. V.; Kholodenko, S. A.; Khudyakov, A. A.; Kolosov, V. N.; Kravtsov, V. I.; Kudenko, Yu. G.; Kulik, A. V.; Kurshetsov, V. F.; Lishin, V. A.; Lysan, V. M.; Medynsky, M. V.; Obraztsov, V. F.; Okhotnikov, A. V.; Polyakov, V. A.; Polyarush, A. Yu; Romanovsky, V. I.; Rykalin, V. I.; Sadovsky, A. S.; Samoylenko, V. D.; Shapkin, M. M.; Tiurin, I. S.; Uvarov, V. A.; Yushchenko, O. P.; Zalikhanov, B. Zh
European physical journal. C, Particles and fields, 04/2024, Volume: 84, Issue: 4Journal Article
Abstract The $$K^{+} \rightarrow \pi ^{+}\pi ^{0}\pi ^{0}\gamma $$ K + → π + π 0 π 0 γ decay is observed by the OKA collaboration. About 60 events of the decay observed with signal:noise $$\approx 1$$ ≈ 1 . The branching ratio obtained by normalization to $$K^{+} \rightarrow \pi ^{+}\pi ^{0}\pi ^{0}$$ K + → π + π 0 π 0 is measured to be $$(3.7 \pm 0.9(stat) \pm 0.3(syst))\times 10^{-6}$$ ( 3.7 ± 0.9 ( s t a t ) ± 0.3 ( s y s t ) ) × 10 - 6 for $$E_{\gamma }^*>10\,\textrm{MeV}$$ E γ ∗ > 10 MeV . The branching ratio, $$\gamma $$ γ energy spectrum and angular distribution are consistent with ChPT prediction.
