Inverse seesaw accompanied by Dirac fermionic dark matter
Abstract
We present an inverse seesaw mechanism by resorting to a U_{(1) B  L} gauge symmetry. In order to cancel the gauge anomalies, we introduce nine neutral fermions among which six participate in the inverse seesaw, while the other three form a Dirac fermion and a massless fermion. In this inverse seesaw, three neutral fermions are the usual righthanded neutrinos while the other three have a small Majorana mass term. An additional seesaw mechanism for generating these small Majorana masses also explains the cosmic baryon asymmetry in association with the sphaleron processes. The Dirac fermion becomes a stable dark matter while the massless fermion decouples early.
 Publication:

Physics Letters B
 Pub Date:
 July 2020
 DOI:
 10.1016/j.physletb.2020.135499
 arXiv:
 arXiv:1907.10018
 Bibcode:
 2020PhLB..80635499G
 Keywords:

 High Energy Physics  Phenomenology
 EPrint:
 11 pages, 4 figures. Dirac seesaw mediated by heavy fermion doublets is included. References are added