Radiative Seesaw Model with Non-zero \theta_{13} and Warm Dark Matter Scenario

TL;DR

This paper evaluates Ma's radiative seesaw model's viability considering recent experimental data, exploring both cold and warm dark matter scenarios, and analyzing constraints from flavor violation and muon g-2 anomaly.

Contribution

It provides a minimal assumption analysis of the model's feasibility, constrains parameter space, and explores thermal relic production with entropy dilution for warm dark matter.

Findings

Preferred mass spectrum M_1 < m_0 < M_2 for CDM

Strong constraints from  ightarrow e  process

Relic abundance in WDM achieved via thermal production and entropy dilution

Abstract

With updated experiment result, we study Ma's radiative seesaw model. We try to use fewer assumptions to study the feasibility of this model. Both CDM and WDM scenario are taken into consideration. In CDM scenario, the fitting of relic abundance shows that a mass spectrum M_1 < m_0 < M_2 is preferred if theory remains perturbability. By studying the flavour violation process \mu \rightarrow e \gamma and relic density abundance, we get very strong constraint for the model. In addition, we try to explain muon anomaly a_{\mu} \equiv (g-2)/2 within the model, but the contribution induced by new particles is too small to account for the discrepancy. In WDM scenario, We show that relic abundance can be produced by thermal production with subsequent entropy dilution process. The entropy dilution can be attained by N_2 decay in which a mass spectrum M_1 < M_2 < m_0 is required.