Inverse seesaw model with large SU (2) L multiplets and natural mass hierarchy

Nomura, Takaaki  (School of Physics, KIAS, Seoul, 02455, Republic of Korea) ; Okada, Hiroshi (Asia Pacific Center for Theoretical Physics, Pohang, Geyoengbuk, 790-784, Republic of Korea)

09 April 2019

Abstract: We propose an inverse seesaw model with large SU(2)L multiplet fields which realizes natural mass hierarchies among neutral fermions. Here, lighter neutral fermion mass matrices are induced via two suppression mechanisms; one is small vacuum expectation value of SU(2)L triplet required by rho parameter constraint and the other is generation of Majorana mass term of extra singlet fermions at one-loop level. To realize the loop masses, we impose Z2 symmetry which also guarantees stability of a dark matter candidate. Furthermore, we discuss anomalous magnetic moment and collider physics from interactions of large multiplet fields.

Published in: Physics letters B 792 (2019) 424-429
Published by: Elsevier
DOI: 10.1016/j.physletb.2019.04.006
License: CC-BY-3.0

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