arXiv · 1808.09176
Study of the decay $K^{+}\to\pi^{+}\pi^{-}\pi^{+}\gamma$ in the OKA experiment
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 $K^{+}\to\pi^{+}\pi^{-}\pi^{+}\gamma$ decays with the energy of the photon in the kaon rest frame greater than 30 MeV. The measured branching fraction of the $K^{+}\to\pi^{+}\pi^{-}\pi^{+}\gamma$, with $E_{\gamma}^{*}$ > 30 MeV is $(0.71 \pm 0.05) \times 10^{-5}$. The measured energy spectrum of the decay photon 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.
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M. M. Shapkin, S. A. Akimenko, A. V. Artamonov, A. M. Blik, V. S. Burtovoy, S. V. Donskov, A. P. Filin, A. V. Inyakin, A. M. Gorin, G. V. Khaustov, S. A. Kholodenko, V. N. Kolosov, A. S. Konstantinov, V. F. Kurshetsov, V. A. Lishin, M. V. Medynsky, Yu. V. Mikhailov, V. F. Obraztsov, V. A. Polyakov, A. V. Popov, V. I. Romanovsky, V. I. Rykalin, A. S. Sadovsky, V. D. Samoilenko, V. K. Semenov, O. V. Stenyakin, O. G. Tchikilev, V. A. Uvarov, O. P. Yushchenko, V. A. Duk, S. N. Filippov, E. N. Guschin, A. A. Khudyakov, V. I. Kravtsov, Yu. G. Kudenko, A. Yu. Polyarush, V. N. Bychkov, G. D. Kekelidze, V. M. Lysan, B. Zh. Zalikhanov. 2018-08-28. Study of the decay $K^{+}\to\pi^{+}\pi^{-}\pi^{+}\gamma$ in the OKA experiment. https://doi.org/10.1140/epjc%2Fs10052-019-6797-1
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