Baryogenesis with Higher Dimension Operators

TL;DR

This paper introduces a baryogenesis model using higher dimension operators coupling the standard model to a singlet X, which decays out of equilibrium to generate baryon asymmetry and potentially dark matter, with testable experimental signatures.

Contribution

It presents a simple, testable baryogenesis mechanism involving higher dimension operators and a TeV-scale singlet X, connecting baryon asymmetry and dark matter production.

Findings

X decays out of equilibrium, producing baryon asymmetry.

Model parameters accessible to neutron-antineutron oscillation experiments.

Potential for experimental detection via flavor physics and proton decay.

Abstract

We propose a simple model of baryogenesis comprised of the standard model coupled to a singlet X via higher dimension operators O. In the early universe, X is thermalized by O mediated scattering processes before it decouples relativistically and evolves into a sizable fraction of the total energy density. Eventually, X decays via O in an out of equilibrium, baryon number and CP violating process that releases entropy and achieves baryogenesis for a broad range of parameters. The decay can also produce a primordial abundance of dark matter. Because X may be as light as a TeV, viable regions of parameter space lie within reach of experimental probes of neutron-antineutron oscillation, flavor physics, and proton decay.