Study of the decay K+→π+π-π+γ in the OKA experiment

Shapkin, M. M. (Aff1, 0000000406204151, grid.18919.38, NRC “Kurchatov Institute”-IHEP, 142281, Protvino, Russia) ; Akimenko, S. A. (Aff1, 0000000406204151, grid.18919.38, NRC “Kurchatov Institute”-IHEP, 142281, Protvino, Russia) ; Artamonov, A. V. (Aff1, 0000000406204151, grid.18919.38, NRC “Kurchatov Institute”-IHEP, 142281, Protvino, Russia) ; Blik, A. M. (Aff1, 0000000406204151, grid.18919.38, NRC “Kurchatov Institute”-IHEP, 142281, Protvino, Russia) ; Burtovoy, V. S. (Aff1, 0000000406204151, grid.18919.38, NRC “Kurchatov Institute”-IHEP, 142281, Protvino, Russia) ; Bychkov, V. N. (Aff3, 0000000406204119, grid.33762.33, Joint Institute of Nuclear Research, 141980, Dubna, Russia) ; Donskov, S. V. (Aff1, 0000000406204151, grid.18919.38, NRC “Kurchatov Institute”-IHEP, 142281, Protvino, Russia) ; Duk, V. A. (Aff2, 0000 0000 9467 3767, grid.425051.7, Institute for Nuclear Research of the Russian Academy of Sciences, 117312, Moscow, Russia) (Aff4, 0000 0004 1936 7486, grid.6572.6, University of Birmingham, Birmingham, UK) ; Filin, A. P. (Aff1, 0000000406204151, grid.18919.38, NRC “Kurchatov Institute”-IHEP, 142281, Protvino, Russia) ; Filippov, S. N. (Aff2, 0000 0000 9467 3767, grid.425051.7, Institute for Nuclear Research of the Russian Academy of Sciences, 117312, Moscow, Russia) ; Gorin, A. M. (Aff1, 0000000406204151, grid.18919.38, NRC “Kurchatov Institute”-IHEP, 142281, Protvino, Russia) ; Gushchin, E. N. (Aff2, 0000 0000 9467 3767, grid.425051.7, Institute for Nuclear Research of the Russian Academy of Sciences, 117312, Moscow, Russia) ; Inyakin, A. V. (Aff1, 0000000406204151, grid.18919.38, NRC “Kurchatov Institute”-IHEP, 142281, Protvino, Russia) ; Kekelidze, G. D. (Aff3, 0000000406204119, grid.33762.33, Joint Institute of Nuclear Research, 141980, Dubna, Russia) ; Khaustov, G. V. (Aff1, 0000000406204151, grid.18919.38, NRC “Kurchatov Institute”-IHEP, 142281, Protvino, Russia) ; Kholodenko, S. A. (Aff1, 0000000406204151, grid.18919.38, NRC “Kurchatov Institute”-IHEP, 142281, Protvino, Russia) ; Khudyakov, A. A. (Aff2, 0000 0000 9467 3767, grid.425051.7, Institute for Nuclear Research of the Russian Academy of Sciences, 117312, Moscow, Russia) ; Kolosov, V. N. (Aff1, 0000000406204151, grid.18919.38, NRC “Kurchatov Institute”-IHEP, 142281, Protvino, Russia) ; Konstantinov, A. S. (Aff1, 0000000406204151, grid.18919.38, NRC “Kurchatov Institute”-IHEP, 142281, Protvino, Russia) ; Kravtsov, V. I. (Aff2, 0000 0000 9467 3767, grid.425051.7, Institute for Nuclear Research of the Russian Academy of Sciences, 117312, Moscow, Russia) ; Kudenko, Yu. G. (Aff2, 0000 0000 9467 3767, grid.425051.7, Institute for Nuclear Research of the Russian Academy of Sciences, 117312, Moscow, Russia) (Aff5, 0000 0000 8868 5198, grid.183446.c, Also at National Research Nuclear University (MEPhI), Moscow, Russia) (Aff6, grid.499221.5, Institute of Physics and Technology, Moscow, Russia) ; Kurshetsov, V. F. (Aff1, 0000000406204151, grid.18919.38, NRC “Kurchatov Institute”-IHEP, 142281, Protvino, Russia) ; Lishin, V. A. (Aff1, 0000000406204151, grid.18919.38, NRC “Kurchatov Institute”-IHEP, 142281, Protvino, Russia) ; Lysan, V. M. (Aff3, 0000000406204119, grid.33762.33, Joint Institute of Nuclear Research, 141980, Dubna, Russia) ; Medynsky, M. V. (Aff1, 0000000406204151, grid.18919.38, NRC “Kurchatov Institute”-IHEP, 142281, Protvino, Russia) ; Mikhailov, Yu. V. (Aff1, 0000000406204151, grid.18919.38, NRC “Kurchatov Institute”-IHEP, 142281, Protvino, Russia) ; Obraztsov, V. F. (Aff1, 0000000406204151, grid.18919.38, NRC “Kurchatov Institute”-IHEP, 142281, Protvino, Russia) ; Polyakov, V. A. (Aff1, 0000000406204151, grid.18919.38, NRC “Kurchatov Institute”-IHEP, 142281, Protvino, Russia) ; Polyarush, A. Yu. (Aff2, 0000 0000 9467 3767, grid.425051.7, Institute for Nuclear Research of the Russian Academy of Sciences, 117312, Moscow, Russia) ; Popov, A. V. (Aff1, 0000000406204151, grid.18919.38, NRC “Kurchatov Institute”-IHEP, 142281, Protvino, Russia) ; Romanovsky, V. I. (Aff1, 0000000406204151, grid.18919.38, NRC “Kurchatov Institute”-IHEP, 142281, Protvino, Russia) ; Rykalin, V. I. (Aff1, 0000000406204151, grid.18919.38, NRC “Kurchatov Institute”-IHEP, 142281, Protvino, Russia) ; Sadovsky, A. S. (Aff1, 0000000406204151, grid.18919.38, NRC “Kurchatov Institute”-IHEP, 142281, Protvino, Russia) ; Samoilenko, V. D. (Aff1, 0000000406204151, grid.18919.38, NRC “Kurchatov Institute”-IHEP, 142281, Protvino, Russia) ; Semenov, V. K. (Aff1, 0000000406204151, grid.18919.38, NRC “Kurchatov Institute”-IHEP, 142281, Protvino, Russia) ; Stenyakin, O. V. (Aff1, 0000000406204151, grid.18919.38, NRC “Kurchatov Institute”-IHEP, 142281, Protvino, Russia) ; Tchikilev, O. G. (Aff1, 0000000406204151, grid.18919.38, NRC “Kurchatov Institute”-IHEP, 142281, Protvino, Russia) ; Uvarov, V. A. (Aff1, 0000000406204151, grid.18919.38, NRC “Kurchatov Institute”-IHEP, 142281, Protvino, Russia) ; Yushchenko, O. P. (Aff1, 0000000406204151, grid.18919.38, NRC “Kurchatov Institute”-IHEP, 142281, Protvino, Russia) ; Zalikhanov, B. Zh. (Aff3, 0000000406204119, grid.33762.33, Joint Institute of Nuclear Research, 141980, Dubna, Russia)

09 April 2019

Abstract: 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 Eγ∗>30MeV 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(p4) . A search for an up-down asymmetry of the photon with respect to the hadronic system decay plane is also performed.


Published in: EPJC 79 (2019) 296
Published by: Springer/Società Italiana di Fisica
DOI: 10.1140/epjc/s10052-019-6797-1
License: CC-BY-3.0



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