Decaying Dark Atom constituents and cosmic positron excess

Preprint number: CP3-Origins-2014-5 DNRF90 and DIAS-2014-5
Authors: Kostya Belotsky (National Research Nuclear University “Moscow Engineering Physics Institute´´), Maxim Khlopov (APC laboratory), Christoforos Kouvaris (CP3-Origins & DIAS), and Maxim Laletin (National Research Nuclear University “Moscow Engineering Physics Institute´´)
External link: arXiv.org

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We present a scenario where dark matter is in the form of dark atoms that can accomodate the experimentally observed excess of positrons in PAMELA and AMS-02 while being compatible with the constraints imposed on the gamma-ray flux from Fermi/LAT. This scenario assumes that the dominant component of dark matter is in the form of a bound state between a helium nucleus and a −2 particle and a small component is in the form of a WIMP-like dark atom compatible with direct searches in underground detectors. One of the constituents of this WIMP-like state is a +2 metastable particle with a mass of 1 TeV or slightly below that by decaying to e+e+, μ+ μ+ and τ+ τ+ produces the observed positron excess. These decays can naturally take place via GUT interactions. If it exists, such a metastable particle can be found in the next run of LHC. The model predicts also the ratio of leptons over baryons in the Universe to be close to -3.