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Anti-helium from Dark Matter annihilations · Around

2014

Anti-helium from Dark Matter annihilations

Cirelli, Marco, Fornengo, Nicolao, Taoso, Marco et al.

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Galactic Dark Matter (DM) annihilations can produce cosmic-ray anti-nuclei via the nuclear coalescence of the anti-protons and anti-neutrons originated directly from the annihilation process.

Since anti-deuterons have been shown to offer a distinctive DM signal, with potentially good prospects of detection in large portions of the DM-particle parameter space, we explore here the production of heavier anti-nuclei, specifically anti-helium.
Even more than for anti-deuterons, the DM-produced anti-He flux can be mostly prominent over the astrophysical anti-He background at low kinetic energies, typically below 3-5 GeV/n.
However, the larger number of anti-nucleons involved in the formation process makes the anti-He flux extremely small.

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