Decaying Dark Atom Constituents and Cosmic Positron Excess

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

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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.
TidsskriftAdvances in High Energy Physics
Sider (fra-til)10
StatusUdgivet - 2014

Bibliografisk note

ISI Document Delivery No.: AF9EZ Times Cited: 3 Cited Reference Count: 100 Belotsky, K. Khlopov, M. Kouvaris, C. Laletin, M. Danish National Research Foundation [DNRF90] C. Kouvaris is supported by the Danish National Research Foundation, Grant no. DNRF90. 3 HINDAWI PUBLISHING CORPORATION NEW YORK ADV HIGH ENERGY PHYS