PAMELA Positron Excess as a Signal from the Hidden Sector

Details PAMELA Positron Excess as a Signal from the Hidden Sector PAMELA Positron Excess as a Signal from the Hidden Sector

2008-10-31

arxiv.org/abs/0810.5762v3

Phys.Rev.D79:063509,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages,3 figures; Breit-Wigner enhancement emphasized; published in PRD

Scientific paper

10.1103/PhysRevD.79.063509

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 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. Further test of the proposed model can come at the Large Hadron Collider. The predictions of the $\bar p/p$ flux ratio also fit the data.

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