PAMELA positron excess as a signal from the hidden sector
By D. Feldman, Zuowei Liu, P. Nath. 2008
168 citations recorded by the source corpus.
The recent positron excess observed in the PAMELA satellite experiment strengthens previous experimental findings. We give here an analysis of this excess in the framework of the Stueckelberg extension of the standard model which includes an extra $U(1{)}_{X}$ gauge field and matter in the hidden sector. Such matter can produce the right amount of dark matter consistent with the Wilkinson Microwave Anisotropy Probe (WMAP) constraints. Assuming the hidden sector matter to be Dirac fermions it is shown that their annihilation can produce the positron excess with the right positron energy dependence seen in the HEAT, AMS, and the PAMELA experiments. The predictions of the $\overline{p}/p$ flux ratio also fit the data.
Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/628eab8355128ad51fa793e2a2e42bbdf9f9a8e4
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Citations in the corpus
- Composite scalar dark matter (2012, background): “This boost factor can be invoked to explain some recent anomalies reported in cosmic ray data [40, 42].”
- Dark Matter Candidates from Particle Physics and Methods of Detection (2010, background): “There are other proposed dark matter explanations: for example, the annihilation cross section may be boosted by resonances from states with mass ∼ 2mX (113; 114; 115; 116), or the dark matter may be produced not by thermal freeze out, but by decays (117).”