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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
The European physical journal. C, Particles and fields, 04/2019, Letnik: 79, Številka: 4Journal Article
A high statistics data sample of the decays of Formula omitted 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 Formula omitted decays with the energy of the photon in the kaon rest frame greater than 30 MeV. The measured branching fraction of the Formula omitted, with Formula omitted is equal to Formula omitted. The measured differential branching fraction over photon energy is compared with the prediction of the chiral perturbation theory to Formula omitted. A search for an up-down asymmetry of the photon with respect to the hadronic system decay plane is also performed.
