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Shapkin, M. M.; Akimenko, S. A.; Artamonov, A. V.; Blik, A. M.; Burtovoy, V. S.; Bychkov, V. N.; Donskov, S. V.; Duk, V. A.; 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.; Konstantinov, A. S.; Kravtsov, V. I.; Kudenko, Yu. G.; Kurshetsov, V. F.; Lishin, V. A.; Lysan, V. M.; Medynsky, M. V.; Mikhailov, Yu. V.; Obraztsov, V. F.; Polyakov, V. A.; Polyarush, A. Yu; Popov, A. V.; Romanovsky, V. I.; Rykalin, V. I.; Sadovsky, A. S.; Samoilenko, V. D.; Semenov, V. K.; Stenyakin, O. V.; Tchikilev, O. G.; Uvarov, V. A.; Yushchenko, O. P.; Zalikhanov, B. Zh
The European physical journal. C, Particles and fields, 04/2019, Volume: 79, Issue: 4Journal Article
A high statistics data sample of the decays of K + mesons to three charged particles was accumulated by the OKA experiment in 2012 and 2013. This allowed to select a clean sample of about 450 events with K + → π + π - π + γ decays with the energy of the photon in the kaon rest frame greater than 30 MeV. The measured branching fraction of the K + → π + π - π + γ , with E γ ∗ > 30 MeV is equal to ( 0.71 ± 0.05 ) × 10 - 5 . The measured differential branching fraction over photon energy is compared with the prediction of the chiral perturbation theory to O ( p 4 ) . A search for an up-down asymmetry of the photon with respect to the hadronic system decay plane is also performed.
