학술논문
Searches for the light invisible axion-like particle in $$K^{+} \rightarrow \pi ^{+}\pi ^{0} a$$ K + → π + π 0 a decay
Document Type
article
Author
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
Source
European Physical Journal C: Particles and Fields, Vol 84, Iss 3, Pp 1-6 (2024)
Subject
Language
English
ISSN
1434-6052
Abstract
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 $$K^{+} \rightarrow \pi ^{+} \pi ^{0} a$$ K + → π + π 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 · 10 - 6 to $$2\cdot 10^{-7}$$ 2 · 10 - 7 for the ALP mass from 0 to 200 MeV/ $$c^{2}$$ c 2 , except for the region of $$\pi ^{0}$$ π 0 mass, where the upper limit is $$4.4\cdot 10^{-6}$$ 4.4 · 10 - 6 .