Antimatter signals of singlet scalar dark matter

TL;DR

This paper analyzes the potential of antiproton and positron signals from singlet scalar dark matter annihilations to constrain or detect the model, highlighting antiprotons as a more promising detection channel for upcoming experiments.

Contribution

It provides a detailed study of antiproton and positron signals in the singlet scalar dark matter model, including current constraints and future detection prospects with AMS-02.

Findings

Antiproton signals are more detectable than positron signals across the parameter space.

AMS-02 can probe dark matter masses up to 600 GeV via antiprotons without boost factors.

Dark matter substructures can enhance the expected signals.

Abstract

We consider the singlet scalar model of dark matter and study the expected antiproton and positron signals from dark matter annihilations. The regions of the viable parameter space of the model that are excluded by present data are determined, as well as those regions that will be probed by the forthcoming experiment AMS-02. In all cases, different propagation models are investigated, and the possible enhancement due to dark matter substructures is analyzed. We find that the antiproton signal is more easily detectable than the positron one over the whole parameter space. For a typical propagation model and without any boost factor, AMS-02 will be able to probe --via antiprotons-- the singlet model of dark matter up to masses of 600 GeV. Antiprotons constitute, therefore, a promising signal to constraint or detect the singlet scalar model.