An SO(10) \times SO(10)' model for common origin of neutrino masses, ordinary and dark matter-antimatter asymmetries

TL;DR

This paper introduces an SO(10)  SO(10)' model that explains neutrino masses, matter-antimatter asymmetries, and dark matter properties through a unified seesaw and leptogenesis framework involving scalar mediators.

Contribution

It presents a novel SO(10)  SO(10)' model with a scalar crossing sector that links neutrino mass generation, matter asymmetries, and dark matter, requiring fewer parameters under mirror symmetry.

Findings

Dark nucleon mass around 15 GeV explains matter fractions

Scalar crossing mediates kinetic mixing, enabling detection prospects

Model unifies neutrino masses, matter asymmetries, and dark matter origin

Abstract

We propose an SO(10) \times SO(10)' model to simultaneously realize a seesaw for Dirac neutrino masses and a leptogenesis for ordinary and dark matter-antimatter asymmetries. A (16\times \overline{16}')_H scalar crossing the SO(10) and SO(10)' sectors plays an essential role in this seesaw-leptogenesis scenario. As a result of lepton number conservation, the lightest dark nucleon as the dark matter particle should have a determined mass around 15 GeV to explain the comparable fractions of ordinary and dark matter in the present universe. The (16\times \overline{16}')_H scalar also mediates a U(1)_{em} \times U(1)'_{em} kinetic mixing after the ordinary and dark left-right symmetry breaking so that we can expect a dark nucleon scattering in direct detection experiments and/or a dark nucleon decay in indirect detection experiments. If a proper mirror symmetry is imposed, our Dirac seesaw will not require more unknown parameters than the canonical Majorana seesaw.