Decaying Dark Atom Constituents and Cosmic Positron Excess

K. Belotsky, M. Khlopov, C. Kouvaris, M. Laletin

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Abstract

We present a scenario where dark matter is in the form of dark atoms that can accommodate the experimentally observed excess of positrons in PAMELA and AMS-02 while being compatible with the constraints imposed on the gamma-ray ux 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(+), mu(+)mu(+) and tau(+) tau(+) 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.
Original languageEnglish
Article number214258
JournalAdvances in High Energy Physics
Pages (from-to)10
ISSN1687-7357
DOIs
Publication statusPublished - 2014

Keywords

  • MIRROR PARTICLES MATTER PHYSICS UNIVERSE CONSTRAINTS MODULATION COSMOLOGY LEPTONS PUZZLES SEARCH

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