Neutrino Masses, Dark Matter and Baryon Asymmetry of the Universe

S Nasri,A Ahriche

doi:10.1088/1742-6596/593/1/012010

Abstract

In this work, we try to explain the neutrino mass and mixing data radiatively at three-loop by extending the standard model (SM) with two charged singlet scalars and three right handed (RH) neutrinos. Here, the lightest RH neutrino is a dark matter candidate that gives a relic density in agreement with the recent Planck data, the model can be consistent with the neutrino oscillation data, lepton flavor violating processes, the electroweak phase transition can be strongly first order; and the charged scalars may enhance the branching ratio h → γγ, where as h → γZ get can get few percent suppression. We also discuss the phenomenological implications of the RH neutrinos at the collider.

Highlights

The Standard Model (SM) of particle physics has been very successful in describing nature at the weak scale, there are many unexplained puzzles left, that implies going beyond standard model (SM)
A popular extension of the SM, is introducing very heavy right-handed (RH) neutrinos, where small neutrino masses are generated via the see-saw mechanism [1], and the BAU is produced via leptogenesis [2]
We have shown that in order to satisfy the recent experimental bound on the lepton flavor violating (LFV) process such as μ → eγ [10]; and the anomalous magnetic moment of the muon [11], one must have three generations of right handed (RH) neutrinos

Summary

Introduction

The Standard Model (SM) of particle physics has been very successful in describing nature at the weak scale, there are many unexplained puzzles left, that implies going beyond SM. Where ρ, κ, j(i, k) are flavor (eigenstates) indices, and the function F is a loop integral given in (A.8) in [9], which was approximated to one in the original work [6] In this model, the radiatively generated neutrino masses are directly proportional to the charged leptons and RH neutrino masses as shown in (3) unlike the conventional seesaw mechanism. Besides neutrino masses and mixing, the Lagrangian (1) induces flavor violating processes such as lα → γlβ if mlα > mlβ , generated at one loop via the exchange of both extra charged scalars Si±. Out of the benchmarks that are in agreement with the neutrino oscillation data, DM and δaμ, only about 15% of the points will survive after imposing the μ → eγ bound

Dark Matter

Phenomenology at the ILC

Findings

Conclusion