Cosmic ray antihelium from a strongly coupled dark sector

• Standard Model extensions with a strongly coupled dark sector can induce high-multiplicity states of soft quarks. Such final states trigger extremely efficient antinucleus formation. We show that dark matter annihilation or decay into a strongly coupled sector can dramatically enhance the cosmic-ray antinuclei flux-by six orders of magnitude in the case of 4He. In this work, we argue that the tentative 3He and 4He events reported by the AMS-02 Collaboration could be the first sign of a strongly coupled dark sector observed in nature.

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NATURVETENSKAP  -- Fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences (hsv//eng)

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