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Advances in High Energy Physics
Volume 2014 (2014), Article ID 214258, 10 pages
Research Article

Decaying Dark Atom Constituents and Cosmic Positron Excess

1National Research Nuclear University “Moscow Engineering Physics Institute”, Moscow 115409, Russia
2Centre for Cosmoparticle Physics “Cosmion”, Moscow 115409, Russia
3APC laboratory 10, rue Alice Domon et Léonie Duquet, 75205 Paris Cedex 13, France
4CP3-Origins, University of Southern Denmark, Campusvej 55, 5230 Odense, Denmark

Received 30 November 2013; Revised 3 March 2014; Accepted 20 March 2014; Published 16 April 2014

Academic Editor: Jean-René Cudell

Copyright © 2014 K. Belotsky et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The publication of this article was funded by SCOAP3.


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 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 metastable particle with a mass of 1 TeV or slightly below that by decaying to , and 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 .