Abstract
Low energy cosmic ray antideuterons provide a unique low background channel for indirect detection of dark matter. We compute the cosmic ray flux of antideuterons from hadronic annihilations of dark matter for various Standard Model final states and determine the mass reach of two future experiments (AMS-02 and GAPS) designed to greatly increase the sensitivity of antideuteron detection over current bounds. We consider generic models of scalar, fermion, and massive vector bosons as thermal dark matter, describe their basic features relevant to direct and indirect detection, and discuss the implications of direct detection bounds on models of dark matter as a thermal relic. We also consider specific dark matter candidates and assess their potential for detection via antideuterons from their hadronic annihilation channels. Since the dark matter mass reach of the GAPS experiment can be well above 100 GeV, we find that antideuterons can be a good indirect detection channel for a variety of thermal relic electroweak scale dark matter candidates, even when the rate for direct detection is highly suppressed.
Highlights
Antimatter is rare in our Universe, making it potentially a good low-background channel in which to search for evidence that dark matter annihilates to Standard Model particles
For dark matter masses of mDM ≥ 50 GeV and an annihilation cross section σ|v| ann ∼ 1 pb, the primary contribution to the antiproton cosmic ray flux of dark matter annihilation will generally be smaller than the secondary contribution from astrophysical processes
We have considered the mass reach of the antideuteron cosmic ray search experiments AMS-02 and General Antiparticle Spectrometer (GAPS)
Summary
Antimatter is rare in our Universe, making it potentially a good low-background channel in which to search for evidence that dark matter annihilates to Standard Model particles. Do antideuterons provide an essentially background free channel in which to indirectly probe dark matter annihilations, but the detection of a signal is preferred by some annihilation modes compared to others It is common in many Beyond the Standard Model (BSM) physics scenarios for the dark matter to have a significant annihilation channel with hadrons in the final state. Independent of a particular BSM physics model, the experimental reach of the GAPS experiment as a function of the present day annihilation cross section and mass for the annihilation channels of W W andbb final states was investigated in [16]. Appendix B contains a brief description of an inelastic dark matter candidate analyzed in SectionV which is compatible with usually stringent solar neutrino bound while explaining DAMA signal
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