A genuine fermionic quintuplet seesaw model: phenomenological introduction

We study a model which generates Majorana neutrino masses at tree-level via low-energy effective operator with mass-dimension-9. Introduction of such higher dimensional brings down the lepton number violating mass scale to TeV making potentially testable present or near future colliders. This possesses several new $SU(2)_L$ fermionic multiplets, in particular, three generations triplets, quadruplets and quintuplets, thus rich phenomenology LHC. As flavour violation arises very naturally setup, we put constraints on Yukawa couplings heavy fermion from current experimental bounds processes. also obtain 95% CL lower quintuplets using recent CMS search for multilepton final states 137 inverse femtobarn integrated luminosity data 13 center energy. The possibility that fermions could be long-lived leaving disappearing charge track signatures displaced vertex colliders like LHeC, FCC-he, MATHUSLA, etc. is discussed.