Bounds on the triplet fermions in type-III seesaw and implications for collider searches

Type-III seesaw is a simple extension of the Standard Model (SM) with the SU(2)(L) triplet fermion with zero hypercharge. It can explain the origin of the tiny neutrino mass and flavor mixing. After the electroweak symmetry breaking the light neutrino mass is generated by the seesaw mechanism which further ensures the mixings between the light neutrino and heavy neutral lepton mass eigenstates. If the triplet fermions are around the electroweak scale having sizable mixings with the SM sector allowed by the correct gauge symmetry, they can be produced at the high energy colliders leaving a variety of characteristic signatures. Based on a simple and concrete realizations of the model we employ a general parametrization for the neutrino Dirac mass matrix and perform a parameter scan to identify the allowed regions satisfying the experimental constraints from the neutrino oscillation data, the electroweak precision measurements and the lepton-flavor violating processes, respectively considering the normal and inverted neutrino mass hierarchies. These parameter regions can be probed at the different collider experiments. (C) 2021 The Author(s). Published by Elsevier B.V.

Automated summary

The Type-III seesaw is a simple extension of the Standard Model that can explain the origin of tiny neutrino mass and flavor mixing. The seesaw mechanism generates light neutrino mass after electroweak symmetry breaking, ensuring mixings between light neutrinos and heavy neutral leptons. The model allows for triplet fermions at the electroweak scale with significant mixings with the Standard Model sector, which can be detected at high energy colliders.