Soft lepton-flavor violation in a multi-Higgs-doublet seesaw model
Soft lepton-flavor violation in a multi-Higgs-doublet seesaw model
We consider the standard model with an arbitrary number ${n}_{H}$ of Higgs doublets and enlarge the lepton sector by adding to each lepton family l a right-handed neutrino singlet ${\ensuremath{\nu}}_{\mathrm{lR}}.$ We assume that all the Yukawa-coupling matrices are diagonal, but the Majorana mass matrix ${M}_{R}$ of the right-handed neutrino singlets …