Charged-lepton decays from soft flavour violation

Autor(en)

E. H. Aeikens, W. Grimus, Luis Lavoura

Abstrakt

We consider a two-Higgs-doublet extension of the Standard Model, with three right-handed neutrino singlets and the seesaw mechanism, wherein all the Yukawa-coupling matrices are lepton flavour-diagonal and lepton flavour violation is soft, originating solely in the non-flavour-diagonal Majorana mass matrix of the right-handed neutrinos. We consider the limit m(R) -> infinity of this model, where m(R) is the seesaw scale. We demonstrate that there is a region in parameter space where the branching ratios of all five charged-lepton decays l(1)-> l(2) l(3)(+) l(3) are close to their experimental upper bounds, while the radiative decays l(1)(-)-> l(2)(-)gamma are invisible because their branching ratios are suppressed by m(R)(-4). We also consider the anomalous magnetic moment of the muon and show that in our model the contributions from the extra scalars, both charged and neutral, can remove the discrepancy between its experimental and theoretical values.

Organisation(en)

Teilchenphysik

Externe Organisation(en)

Universidade de Lisboa

Journal

Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics

Band

768

Seiten

365-372

Anzahl der Seiten

8

ISSN

0370-2693

DOI

https://doi.org/10.1016/j.physletb.2017.03.012

Publikationsdatum

05-2017

Peer-reviewed

Ja

ÖFOS 2012

103034 Teilchenphysik

Schlagwörter

ASJC Scopus Sachgebiete

Nuclear and High Energy Physics

Link zum Portal

https://ucris.univie.ac.at/portal/de/publications/chargedlepton-decays-from-soft-flavour-violation(1ae3e179-5341-432f-b153-cc6191ad56cf).html