PT Journal
AU Herrero-Brocal, A
   Vicente, A
TI The majoron coupling to charged leptons
SO Journal of High Energy Physics
JI J. High Energy Phys.
PY 2024
BP 078
EP 33pp
VL 01
IS 1
DI 10.1007/JHEP01(2024)078
LA English
DE Axions and ALPs; Baryon/Lepton Number Violation; Lepton Flavour Violation (charged)
AB The particle spectrum of all Majorana neutrino mass models with spontaneous violation of global lepton number include a Goldstone boson, the so-called majoron. The presence of this massless pseudoscalar changes the phenomenology dramatically. In this work we derive general analytical expressions for the 1-loop coupling of the majoron to charged leptons. These can be applied to any model featuring a majoron that have a clear hierarchy of energy scales, required for an expansion in powers of the low-energy scale to be valid. We show how to use our general results by applying them to some example models, finding full agreement with previous results in several popular scenarios and deriving novel ones in other setups.
ER