Common origin of baryon asymmetry, Dark Matter and neutrino mass

Anirban Biswas,Sarif Khan,Sandhya Choubey,Laura Covi

doi:10.1007/jhep05(2019)193

Abstract

In this work, we explain three beyond standard model (BSM) phenomena, namely neutrino masses, the baryon asymmetry of the Universe and Dark Matter, within a single model and in each explanation the right handed (RH) neutrinos play the prime role. Indeed by just introducing two RH neutrinos we can generate the neutrino masses by the Type-I seesaw mechanism. The baryon asymmetry of the Universe can arise from thermal leptogenesis from the decay of lightest RH neutrino before the decoupling of the electroweak sphaleron transitions, which redistribute the B − L number into a baryon number. At the same time, the decay of the RH neutrino can produce the Dark Matter (DM) as an asymmetric Dark Matter component. The source of CP violation in the two sectors is exactly the same, related to the complex couplings of the neutrinos. By determining the comoving number density for different values of the CP violation in the DM sector, we obtain a particular value of the DM mass after satisfying the relic density bound. We also give prediction for the DM direct detection (DD) in the near future by different ongoing DD experiments.

Highlights

Another big puzzle is that there exist an excess of baryonic matter over anti-baryonic matter in the Universe and the baryon asymmetry has been measured very precisely by the satellite-based experiments WMAP and Planck [16,17,18]
We mostly focus on the normal hierarchy (NH) of the light neutrino masses, but a similar study can be done for the inverted hierarchical scenario as well
We show the production of the baryon asymmetry and the Dark Matter asymmetry from the decay of right handed (RH) neutrino N1

Summary

Introduction

Another big puzzle is that there exist an excess of baryonic matter over anti-baryonic matter in the Universe and the baryon asymmetry has been measured very precisely by the satellite-based experiments WMAP and Planck [16,17,18]. In order to generate the baryon asymmetry of the Universe, we need to satisfy the Sakharov conditions [21] including sufficient C and CP violation and deviation from thermal equilibrium. One of the scalar doublets takes a vacuum expectation value, generating a mass for the exotic fermions and mixing with the SM Higgs. This opens up the possibility to have DM scatterings mediated by the Higgs fields, which may be detected in different ongoing and proposed direct detection experiments [55,56,57,58,59,60,61].

Objectives

Results

Conclusion