Does asymmetric dark matter always lead to an anti-neutrino signal?

TL;DR

This paper demonstrates that asymmetric dark matter scenarios inherently produce anti-neutrino signals upon decay or annihilation, due to the shared B-L asymmetry, and explores detection prospects in atmospheric neutrino experiments.

Contribution

It proves that ADM always results in anti-neutrino signals and constructs a composite ADM model to analyze detection feasibility.

Findings

ADM decay or annihilation produces anti-neutrinos.

The B-L asymmetry in dark matter and standard model sectors are always aligned.

Detection of anti-neutrino signals in atmospheric detectors is feasible.

Abstract

Under rather generic assumptions, we show that in the asymmetric dark matter (ADM) scenario, the sign of the B-L asymmetry stored in the dark matter sector and the standard model sector are always the same. One particularly striking consequence of this result is that, when the dark matter decays or annihilates in the present universe, the resulting final state always involves an anti-neutrino. As a concrete example of this, we construct a composite ADM model and explore the feasibility of detecting such an anti-neutrino signal in atmospheric neutrino detectors.