Decaying Dark Atom Constituents and Cosmic Positron Excess
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...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Hindawi Limited
2014-01-01
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| Series: | Advances in High Energy Physics |
| Online Access: | http://dx.doi.org/10.1155/2014/214258 |
| Summary: | 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+,
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. |
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| ISSN: | 1687-7357 1687-7365 |