https://doi.org/10.1140/epja/s10050-025-01531-7
Regular Article - Theoretical Physics
Decays 
and 
accounting for the contribution of 
1
Bogoliubov Laboratory of Theoretical Physics, JINR, 141980, Dubna, Moscow region, Russia
2
The Institute of Nuclear Physics, 050032, Almaty, Kazakhstan
Received:
17
December
2024
Accepted:
1
March
2025
Published online:
28
March
2025
In the 
quark NJL model, 
lepton decays with the production of scalar mesons 
and neutrinos are studied, where 
. It is shown that these decays mainly occur via contact channels and channels with axial-vector mesons 
, 
and 
. All mesons are considered as quark-antiquark states in this case. The obtained results can be considered as predictions for future experiments. The obtained estimates for the branching fractions of the 
decay taking into account the contributions of the 
and 
states are in satisfactory agreement with experimental data.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2025
Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
