Dirac dark matter, neutrino masses, and dark baryogenesis

TL;DR

This paper proposes a gauged baryon number model where new fermions address neutrino masses, dark matter, and baryogenesis, linking anomaly cancellation to solving key phenomenological issues in the standard model.

Contribution

It introduces a novel model connecting anomaly cancellation with neutrino mass generation, dark matter, and baryogenesis through a unified fermion sector.

Findings

New fermion content cancels anomalies and explains neutrino masses.

Dark matter is accounted for by SM-singlet fermions.

Dark baryogenesis is enabled by a strong first-order electroweak phase transition.

Abstract

We present a gauged baryon number model as an example of models where all new fermions required to cancel out the anomalies help to solve phenomenological problems of the standard model (SM). Dark fermion doublets, along with the iso-singlet charged fermions, in conjunction with a set of SM-singlet fermions, participate in the generation of small neutrino masses through the Dirac-dark Zee mechanism. The other SM-singlets explain the dark matter in the Universe, while their coupling to an inert singlet scalar is the source of the $CP$ violation. In the presence of a strong first-order electroweak phase transition, this "dark" $CP$ violation allows for a successful electroweak baryogenesis mechanism.