On the role of leptonic CPV phases in cLFV observables

Abstract

In extensions of the Standard Model by Majorana fermions, the presence of additional CP violating phases has been shown to play a crucial role in lepton number violating processes. In this work we show that (Dirac and Majorana) CP violating phases can also lead to important effects in charged lepton flavour violating (cLFV) transitions and decays, in some cases with a significant impact for the predicted rates of cLFV observables. We conduct a thorough exploration of these effects in several cLFV observables, and discuss the implications for future observation. We emphasise how the presence of leptonic CP violating phases might lead to modified cLFV rates, and to a possible loss of correlation between cLFV observables.

35 pages, 16 figures, v2: references updated, matches version published in EPJC

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• Heavy Neutral Leptons -- Advancing into the PeV domain
• Tri-Resonant Leptogenesis in a Seesaw Extension of the Standard Model
• LFV Higgs and $Z$-boson decays: leptonic CPV phases and CP asymmetries
• Sterile neutrinos in ${\Lambda }_b^0\to ({\Lambda }_c^{+},p^{+}){\ell }_1^{-}{\ell }_2^{-}{\ell }_3^{+}\nu$ decays
• Flavor changing neutral couplings for leptons