Abstract
We evaluate the decays \( {\ell}_1^{\pm } \) → \( {\ell}_2^{\pm}\gamma \), Z → \( {\ell}_1^{+}{\ell}_2^{-} \), and h → \( {\ell}_1^{+}{\ell}_2^{-} \), where ℓ1 and ℓ2 are charged leptons with different flavours and h is the scalar particle with mass 125.25 GeV, in a two-Higgs-doublet model where all the Yukawa-coupling matrices conserve the lepton flavours but the Majorana mass terms of the right-handed neutrinos break the flavour lepton numbers. We find that (1) the decays \( {\ell}_1^{\pm } \) → \( {\ell}_2^{\pm}\gamma \) require large Yukawa couplings and very light right-handed neutrinos in order to be visible, (2) the decays Z → \( {\ell}_1^{+}{\ell}_2^{-} \) will be invisible in all the planned experiments, except in a very restricted range of circumstances, but (3) the decays h → \( {\ell}_1^{+}{\ell}_2^{-} \) may be detected in future experiments for rather relaxed sets of input parameters.
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Jurčiukonis, D., Lavoura, L. Two-body lepton-flavour-violating decays in a 2HDM with soft family-lepton-number breaking. J. High Energ. Phys. 2022, 106 (2022). https://doi.org/10.1007/JHEP03(2022)106
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DOI: https://doi.org/10.1007/JHEP03(2022)106