https://doi.org/10.1140/epjc/s10052-021-09151-3
Regular Article - Theoretical Physics
Light Majorana neutrinos in (semi)invisible meson decays
1
Jožef Stefan Institute, Jamova 39, 1000, Ljubljana, Slovenia
2
Faculty of Mathematics and Physics, University of Ljubljana, Jadranska 19, 1000, Ljubljana, Slovenia
Received:
10
August
2020
Accepted:
19
April
2021
Published online:
4
May
2021
We reconsider decays of pseudoscalar mesons (P) to neutrino pairs and possibly additional photons in presence of (light) Majorana neutrinos. For this purpose we derive a model-independent general parametrization of neutrino mass matrices with physically interpretable and irreducible set of parameters. The parametrization is valid for any number of neutrinos and interpolates smoothly between the heavy Majorana and the (pseudo)Dirac neutrino limits. We apply the new parametrization to the study of 
and 
decays within the SM extended by additional singlet fermions. We update the SM predictions for the branching ratios of 
and discuss the sensitivity of the 
decays to neutrino mass and mixing parameters.
© The Author(s) 2021
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