A Simple Testable Model of Baryon Number Violation: Baryogenesis, Dark Matter, Neutron-Antineutron Oscillation and Collider Signals

TL;DR

This paper presents a simple TeV-scale model linking baryon number violation to baryogenesis and dark matter, predicting observable neutron-antineutron oscillations and collider signals, with constraints from multiple experiments.

Contribution

The paper introduces a minimal model connecting baryon violation, dark matter, and baryogenesis, highlighting testable predictions for neutron-antineutron oscillations and collider signals.

Findings

The model predicts a sizable neutron-antineutron oscillation rate.

There is a complementarity between collider signals and low-energy constraints.

Next-generation neutron-antineutron experiments could be more constraining than collider searches.

Abstract

We study a simple TeV-scale model of baryon number violation which explains the observed proximity of the dark matter and baryon abundances. The model has constraints arising from both low and high-energy processes, and in particular, predicts a sizable rate for the neutron-antineutron ($n-\bar{n}$) oscillation at low energy and the monojet signal at the LHC. We find an interesting complementarity among the constraints arising from the observed baryon asymmetry, ratio of dark matter and baryon abundances, $n-\bar{n}$ oscillation lifetime and the LHC monojet signal. There are regions in the parameter space where the $n-\bar{n}$ oscillation lifetime is found to be more constraining than the LHC constraints, which illustrates the importance of the next-generation $n-\bar{n}$ oscillation experiments.