Neutrino mass with large $SU(2{)}_L$ multiplet fields

Abstract

We propose an extension of the standard model introducing large $SU(2{)}_L$ multiplet fields which are quartet and septet scalars and quintet Majorana fermions. These multiplets can induce the neutrino masses via interactions with the $SU(2)$ doublet leptons. We then find the neutrino masses are suppressed by small vacuum expectation value of the quartet/septet and an inverse of quintet fermion mass relaxing the Yukawa hierarchies among the standard model fermions. We also discuss collider physics at the Large Hadron Collider considering production of charged particles in these multiplets, and due to effects of violating custodial symmetry, some specific signatures can be found. Then we discuss the detectability of these signals.

arXiv comment19 pages, 4 figures, 2 tables: version accepted for publication in Physical Review D

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• Effective field theory versus UV-complete model: vector boson scattering as a case study
• Scotogenic neutrino mass with large $SU(2{)}_L$ multiplet fields
• An inverse seesaw model with natural hierarchy at TeV scale
• Inverse seesaw model with large $SU(2{)}_L$ multiplets and natural mass hierarchy
• Unconventional Searches for Exotic Particles at Future Lepton Colliders
• One-loop neutrino mass model with $SU(2{)}_L$ multiplet fields
• Radiative neutrino masses: A window to new physics
• Alternative signatures of the quintuplet fermions at the LHC and future linear colliders