Searches for the light invisible axion-like particle in decay

A. S. Sadovsky; A. P. Filin; S. A. Akimenko; A. V. Artamonov; A. M. Blik; V. N. Bychkov; S. V. Donskov; 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; V. D. Samoylenko; I. S. Tiurin; V. A. Uvarov; O. P. Yushchenko; B. Zh. Zalikhanov

doi:10.1140/epjc/s10052-024-12444-y

2024 Impact factor 4.8

Particles and Fields

Open Access

Eur. Phys. J. C (2024) 84: 266
https://doi.org/10.1140/epjc/s10052-024-12444-y

Regular Article - Experimental Physics

Searches for the light invisible axion-like particle in $K^{+} \to π^{+} π^{0} a$ $K^{+} \rightarrow \pi ^{+}\pi ^{0} a$ decay

A. S. Sadovsky¹^a, A. P. Filin¹, S. A. Akimenko¹, A. V. Artamonov¹, A. M. Blik¹, V. N. Bychkov³, S. V. Donskov¹, S. N. Filippov², A. M. Gorin¹, E. N. Gushchin², A. V. Inyakin¹, G. D. Kekelidze³, G. V. Khaustov¹, S. A. Kholodenko¹, A. A. Khudyakov², V. N. Kolosov¹, V. I. Kravtsov², Yu. G. Kudenko²^,4^,5, A. V. Kulik², 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, V. D. Samoylenko¹, 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 Sciences, 117312, Moscow, Russia
³ Joint Institute of Nuclear Research, 141980, Dubna, Russia
⁴ National Research Nuclear University (MEPhI), Moscow, Russia
⁵ Institute of Physics and Technology, Moscow, Russia

^a Alexander.Sadovskiy@ihep.ru

Received: 26 October 2023
Accepted: 12 January 2024
Published online: 13 March 2024

Abstract

A high-statistics data sample of the $K^{+}$ $K^{+}$ decays is recorded by the OKA collaboration. A missing mass analysis is performed to search for a light invisible pseudoscalar axion-like particle (ALP) a in the decay $K^{+} \to π^{+} π^{0} a$ $K^{+} \rightarrow \pi ^{+} \pi ^{0} a$ . No signal is observed, and the upper limits for the branching ratio of the decay are calculated. The $90 %$ $90\%$ confidence level upper limit changes from $2.5 \cdot 10^{- 6}$ $2.5\cdot 10^{-6}$ to $2 \cdot 10^{- 7}$ $2\cdot 10^{-7}$ for the ALP mass from 0 to 200 MeV/ $c^{2}$ $c^{2}$ , except for the region of $π^{0}$ $\pi ^{0}$ mass, where the upper limit is $4.4 \cdot 10^{- 6}$ $4.4\cdot 10^{-6}$ .

S. A. Akimenko, A. M. Blik: deceased.

© The Author(s) 2024

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