Observation of decay

A. V. Artamonov; V. N. Bychkov; S. V. Donskov; 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; A. V. Kulik; V. F. Kurshetsov; V. A. Lishin; V. M. Lysan; M. V. Medynsky; V. F. Obraztsov; A. V. Okhotnikov; V. A. Polyakov; A. Yu. Polyarush; V. I. Romanovsky; V. I. Rykalin; A. S. Sadovsky; V. D. Samoylenko; M. M. Shapkin; I. S. Tiurin; V. A. Uvarov; O. P. Yushchenko; B. Zh. Zalikhanov

doi:10.1140/epjc/s10052-024-12674-0

EPJ

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2024 Impact factor 4.8

Particles and Fields

Open Access

Eur. Phys. J. C (2024) 84: 345
https://doi.org/10.1140/epjc/s10052-024-12674-0

Regular Article - Experimental Physics

Observation of $K^{+} \to π^{+} π^{0} π^{0} γ$ $K^{+} \rightarrow \pi ^{+}\pi ^{0}\pi ^{0}\gamma$ decay

A. V. Artamonov¹, V. N. Bychkov³, S. V. Donskov¹, A. P. Filin¹, S. N. Filippov², A. M. Gorin¹, E. N. Gushchin², A. V. Inyakin¹, G. D. Kekelidze³, G. V. Khaustov¹, S. A. Kholodenko¹^,4, A. A. Khudyakov², V. N. Kolosov¹, V. I. Kravtsov², Yu. G. Kudenko²^,5, A. V. Kulik²^s, V. F. Kurshetsov¹, V. A. Lishin¹, V. M. Lysan³, M. V. Medynsky¹, V. F. Obraztsov¹, A. V. Okhotnikov¹, V. A. Polyakov¹, A. Yu. Polyarush², V. I. Romanovsky¹, V. I. Rykalin¹, A. S. Sadovsky¹, V. D. Samoylenko¹, M. M. Shapkin¹, I. S. Tiurin¹, V. A. Uvarov¹, O. P. Yushchenko¹ and B. Zh. Zalikhanov³

¹ NRC “Kurchatov Institute”-IHEP, 142281, Protvino, Russia
² Institute for Nuclear Research, Russian Academy of Science, 117312, Moscow, Russia
³ Joint Institute of Nuclear Research, 141980, Dubna, Russia
⁴ INFN, Sezione di Pisa, 3-56127, Pisa, Italy
⁵ Moscow Institute of Physics and Technology (MIPT), and National Research Nuclear University (MEPhI), Moscow, Russia

^s alex.kulik@gmail.com

Received: 31 October 2023
Accepted: 13 March 2024
Published online: 2 April 2024

Abstract

The $K^{+} \to π^{+} π^{0} π^{0} γ$ $K^{+} \rightarrow \pi ^{+}\pi ^{0}\pi ^{0}\gamma$ decay is observed by the OKA collaboration. About 60 events of the decay observed with signal:noise $\approx 1$ $\approx 1$ . The branching ratio obtained by normalization to $K^{+} \to π^{+} π^{0} π^{0}$ $K^{+} \rightarrow \pi ^{+}\pi ^{0}\pi ^{0}$ is measured to be $(3.7 \pm 0.9 (s t a t) \pm 0.3 (s y s t)) \times 10^{- 6}$ $(3.7 \pm 0.9(stat) \pm 0.3(syst))\times 10^{-6}$ for $E_{γ}^{*} > 10 MeV$ $E_{\gamma }^*>10\,\textrm{MeV}$ . The branching ratio, $γ$ $\gamma$ energy spectrum and angular distribution are consistent with ChPT prediction.

© The Author(s) 2024

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

Funded by SCOAP³.

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Observation of K+→π+π0π0γ decay

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Observation of $K^{+} \to π^{+} π^{0} π^{0} γ$ $K^{+} \rightarrow \pi ^{+}\pi ^{0}\pi ^{0}\gamma$ decay