PT Journal
AU Felkl, T
   Herrero-Garcia, J
   Schmidt, MA
TI The singly-charged scalar singlet as the origin of neutrino masses
SO Journal of High Energy Physics
JI J. High Energy Phys.
PY 2021
BP 122
EP 39pp
VL 05
IS 5
DI 10.1007/JHEP05(2021)122
LA English
DE Beyond Standard Model; Neutrino Physics
AB We consider the generation of neutrino masses via a singly-charged scalar singlet. Under general assumptions we identify two distinct structures for the neutrino mass matrix. This yields a constraint for the antisymmetric Yukawa coupling of the singly-charged scalar singlet to two left-handed lepton doublets, irrespective of how the breaking of lepton-number conservation is achieved. The constraint disfavours large hierarchies among the Yukawa couplings. We study the implications for the phenomenology of lepton-flavour universality, measurements of the W-boson mass, flavour violation in the charged-lepton sector and decays of the singly-charged scalar singlet. We also discuss the parameter space that can address the Cabibbo Angle Anomaly.
ER