Neutrino masses, mixing and leptogenesis in TeV scale B-L extension of the standard model

TL;DR

This paper explores how TeV scale B-L extensions of the Standard Model can naturally generate small neutrino masses, explain their mixing, and produce the observed matter-antimatter asymmetry through leptogenesis mechanisms.

Contribution

It introduces a model linking quark and lepton masses, analyzes leptogenesis including new contributions from additional Higgs and gauge bosons, and discusses both thermal and non-thermal leptogenesis scenarios.

Findings

Neutrino masses are correctly obtained with Dirac masses around 10^{-4} GeV.

Resonant leptogenesis can produce sufficient baryon asymmetry.

A potential non-thermal leptogenesis scheme via Higgs decay is proposed.

Abstract

We address the issue of the neutrino masses and mixing in TeV scale $B-L$ extension of the Standard Model. We show that if Dirac neutrino masses are of order $10^{-4}$ Gev, then the measured neutrino masses are correctly obtained. We propose a mass relation between quarks and leptons that may account for such small Dirac neutrino masses. We analyze the leptogenesis in this type of models and provide analytical expressions for the new contributions due to the predicted extra Higgs and extra neutral gauge boson. We find that thermal leptogenesis, with a resonant enhancement due to nearly degenerate right-handed neutrinos, can yield sufficient baryon asymmetry. Finally, we comment on a possible scheme for non-thermal leptogenesis, which is due to the decay of extra Higgs into right-handed neutrino.