Dark matter implications of the neutron anomaly

TL;DR

This paper explores how the neutron decay anomaly could be explained by a dark matter model involving new particles, requiring two generations of these particles to fit observational constraints.

Contribution

It provides a detailed calculation of the neutron decay process involving dark matter particles and identifies the necessity of two generations of dark matter particles for consistency.

Findings

Two generations of dark matter particles are needed to fit the neutron decay anomaly.

The decay rate calculations align with observational bounds.

The model offers a potential explanation for the neutron decay anomaly.

Abstract

Motivated by the neutron decay anomaly, we reconsider the neutron decay model $n \rightarrow \chi\chi\chi$, where the new species $\chi$ plays the role of dark matter. We precisely compute the $\bar{\chi} n \rightarrow \chi\chi$ rate finding that fitting the anomaly compatibly with all bounds needs two ''generations'' of the $\chi$ particle.