Neutrino Masses and TeV-scale Particles Testable at the LHC

TL;DR

This paper explores TeV-scale particles in higher weak-isospin multiplets that enable new seesaw mechanisms for neutrino masses, which are testable at the LHC and may also offer dark matter candidates.

Contribution

It introduces novel seesaw mechanisms involving higher multiplets and discusses their testability and dark matter implications.

Findings

New seesaw mechanisms with quintuplets are viable at TeV scale.

Model predicts observable signals at the LHC.

Potential dark matter candidate identified.

Abstract

We consider a scenario in which TeV-scale particles belonging to weak-isospin multiplets higher than triplets lead to novel seesaw mechanisms different from conventional type I, II and III seesaw models. Besides an appealing testability of these mechanisms at the LHC, the model with Majorana quintuplets with imposed discrete symmetry may provide viable dark matter candidate.