Dark matter implications of the neutron 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.