Limits on the Dark Matter from AMS-02 antiproton and positron fraction data

TL;DR

This paper sets new constraints on dark matter properties by analyzing AMS-02 cosmic ray data, considering secondary particle acceleration in supernova remnants, and comparing results with gamma-ray observations, highlighting the importance of cosmic ray propagation parameters.

Contribution

It introduces a method to derive dark matter limits using AMS-02 data with secondary particle acceleration models and compares these limits to gamma-ray constraints.

Findings

Stronger dark matter limits than Fermi-LAT gamma-ray data.

Solar modulation parameters significantly affect constraints for certain dark matter masses.

Provided limits on dark matter effective field theories.

Abstract

We derive limits on the dark matter annihilation cross section and lifetime using measurements of the AMS-02 antiproton ratio and positron fraction data. In deriving the limits, we consider the scenario of secondary particles accelerated in supernova remnants (SNRs) which has been argued to be able to reasonably account for the AMS-02 high energy positron/antiproton fraction data. We parameterize the contribution of secondary particles accelerated in SNRs and then fit the observational data within the conventional cosmic ray propagation model by adopting the GALPROP code. We use the likelihood ratio test to determine the 95$\%$ confidence level upper limits of the possible dark matter (DM) contribution to the antiproton/positron fractions measured by AMS-02. Our limits are stronger than that set by the Fermi-LAT gamma-ray Pass 8 data of the dwarf spheroidal satellite galaxies. We also show that the solar modulation (cosmic ray propagation) parameters can play a non-negligible role in modifying the constraints on the dark matter annihilation cross section and lifetime for $m_\chi<100$ GeV ($m_\chi>100$ GeV), where $m_\chi$ is the rest mass of the dark matter particles. Using this results, we also put limits on the effective field theory of dark matter.