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We reconsider decays of pseudoscalar mesons (P) to neutrino pairs andpossibly additional photons in presence of (light) Majorana neutrinos. For thispurpose we derive a model-independent general parametrization of neutrino massmatrices with physically interpretable and irreducible set of parameters. Theparametrization is valid for any number of neutrinos and interpolates smoothlybetween the heavy Majorana and the (pseudo)Dirac neutrino limits. We apply thenew parametrization to the study of $P \rightarrow \nu \nu$ and $P \rightarrow\nu \nu \gamma$ decays within the SM extended by additional singlet fermions.We update the SM predictions for the branching ratios of $B_{s,d} \rightarrow\nu \nu \gamma$ and discuss the sensitivity of the $B_{s,d} \rightarrow E_{\rmmiss} (\gamma)$ decays to neutrino mass and mixing parameters.

Light Majorana Neutrinos in (Semi)invisible Meson Decays