Study of $$K^+ \rightarrow \pi ^{0} e^{+} \nu \gamma $$ K + → π 0 e + ν γ decay with OKA setup

Autor: A. Yu. Polyarush, S. A. Akimenko, A. V. Artamonov, A. M. Blik, V. S. Burtovoy, V. N. Bychkov, S. V. Donskov, V. A. Duk, A. P. Filin, S. N. Filippov, A. M. Gorin, E. N. Gushchin, A. V. Inyakin, G. D. Kekelidze, G. V. Khaustov, S. A. Kholodenko, A. A. Khudyakov, V. N. Kolosov, V. I. Kravtsov, Yu. G. Kudenko, V. F. Kurshetsov, V. A. Lishin, V. M. Lysan, M. V. Medynsky, Yu. V. Mikhailov, V. F. Obraztsov, V. A. Polyakov, V. I. Romanovsky, V. I. Rykalin, A. S. Sadovsky, V. D. Samoilenko, M. M. Shapkin, O. V. Stenyakin, O. G. Tchikilev, V. A. Uvarov, O. P. Yushchenko, B. Zh. Zalikhanov
Jazyk: angličtina
Rok vydání: 2021
Předmět:
Zdroj: European Physical Journal C: Particles and Fields, Vol 81, Iss 2, Pp 1-5 (2021)
Druh dokumentu: article
ISSN: 1434-6044
1434-6052
DOI: 10.1140/epjc/s10052-021-08895-2
Popis: Abstract Results of a study of the $$K^+ \rightarrow \pi ^{0} e^{+} \nu \gamma $$ 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 $$K_{e3}$$ K e 3 decay are calculated for different cuts on $$E^*_\gamma $$ E γ ∗ and $$cos\Theta ^{*}_{e\gamma }$$ c o s Θ e γ ∗ . In particular, the branching ratio for $$E^{*}_{\gamma }>30$$ E γ ∗ > 30 MeV and $$\Theta ^{*}_{e \gamma }>20^{\circ }$$ Θ e γ ∗ > 20 ∘ is measured R = $$\frac{Br(K^+ \rightarrow \pi ^{0} e^{+} \nu _{e} \gamma ) }{Br(K^+ \rightarrow \pi ^{0} e^{+} \nu _{e})} $$ 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.)) $$\times 10^{-2}$$ × 10 - 2 , which is in a good agreement with ChPT $$O(p^{4})$$ O ( p 4 ) calculations.
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