Author:
Sadovsky A. S.,Filin A. P.,Akimenko S. A.,Artamonov A. V.,Blik A. M.,Bychkov V. N.,Donskov S. V.,Filippov S. N.,Gorin A. M.,Gushchin E. N.,Inyakin A. V.,Kekelidze G. D.,Khaustov G. V.,Kholodenko S. A.,Khudyakov A. A.,Kolosov V. N.,Kravtsov V. I.,Kudenko Yu. G.,Kulik A. V.,Kurshetsov V. F.,Lishin V. A.,Lysan V. M.,Medynsky M. V.,Obraztsov V. F.,Okhotnikov A. V.,Polyakov V. A.,Polyarush A. Yu.,Romanovsky V. I.,Rykalin V. I.,Samoylenko V. D.,Tiurin I. S.,Uvarov V. A.,Yushchenko O. P.,Zalikhanov B. Zh.
Abstract
AbstractA 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
.
Publisher
Springer Science and Business Media LLC
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