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Polyarush, A. Yu; 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.; 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.; Romanovsky, V. I.; Rykalin, V. I.; Sadovsky, A. S.; Samoilenko, V. D.; Shapkin, M. M.; Stenyakin, O. V.; Tchikilev, O. G.; Uvarov, V. A.; Yushchenko, O. P.; Zalikhanov, B. Zh
The European physical journal. C, Particles and fields, 02/2021, Letnik: 81, Številka: 2Journal Article
Results of a study of the K + → π 0 e + ν γ decay at OKA setup are presented. More than 32,000 events of this decay are observed. The differential spectra over the photon energy and the photon–electron opening angle in kaon rest frame are presented. The branching ratios, normalized to that of K e 3 decay are calculated for different cuts on E γ ∗ and c o s Θ e γ ∗ . In particular, the branching ratio for E γ ∗ > 30 MeV and Θ e γ ∗ > 20 ∘ is measured R = B r ( K + → π 0 e + ν e γ ) B r ( K + → π 0 e + ν e ) = = (0.587±0.010( stat .)±0.015( syst .)) × 10 - 2 , which is in a good agreement with ChPT O ( p 4 ) calculations.
