Simplified dark matter models in the light of AMS-02 antiproton data

Abstract

In this work we perform an analysis of the recent AMS-02 antiproton flux and the antiproton-to-proton ratio in the framework of simplified dark matter models. To predict the AMS-02 observables we adopt the propagation and injection parameters determined by the observed fluxes of nuclei. We assume that the dark matter particle is a Dirac fermionic dark matter, with leptophobic pseudoscalar or axialvector mediator that couples only to Standard Model quarks and dark matter particles. We find that the AMS-02 observations are consistent with the dark matter framework within the uncertainties. The antiproton data prefer a dark matter (mediator) mass in the 700 GeV-5 TeV region for the annihilation with pseudoscalar mediator and greater than 700 GeV (200 GeV-1 TeV) for the annihilation with axialvector mediator, respectively, at about 68% confidence level. The AMS-02 data require an effective dark matter annihilation cross section in the region of 1 × 10 −25 -1 × 10 −24 (1 × 10 −25 -4 × 10 −24 ) cm 3 /s for the simplified model with pseudoscalar (axialvector) mediator. The constraints from the LHC and Fermi-LAT are also discussed.

Revisit of cosmic ray antiprotons from dark matter annihilation with updated constraints on the background model from AMS-02 and collider data

“…Compared with the background prediction, excesses of antiprotons can be seen around a few GeV. It is interesting to note that at high energies the background model is quite consistent with the data, without any significant excess [19,[22][23][24][25].…”

The dawn of FIMP Dark Matter: A review of models and constraints

“…However, while the DM interpretation has been challenged by many authors [98,102,103,[105][106][107][108][109][110], it is not in contradiction with observations of dwarf galaxies [111] or the galactic center [112].The AMS-02 experiment on board the international space station has measured the fluxes of various charged particles in cosmic rays. The ratio of antiproton and proton fluxes exhibits an excess over the estimated background [113], that has been interpreted as a signal of DM annihilations [114][115][116][117][118][119][120][121]. Intriguingly, some of the above references report good agreement with DM annihilations as an explanation for both the AMS antiproton data and the galactic center gamma ray excess discussed above.…”

Cold Particle Dark Matter

“…The ratio of antiproton and proton fluxes measured by AMS-02 experiment, exhibits an excess over the expected background [111]. This can be interpreted as a signal of DM annihilations [112][113][114][115][116][117][118][119]. In some of these analyses, DM annihilations can explain excess both in the AMS antiproton data and in the galactic center gamma rays-see e.g., [120].…”