Abstract
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 pp flux ratio also fit the data.
Keywords
PAMELA, WAMP, positron excess
Subject Categories
Dark matter (Astronomy)
Disciplines
Physics
Publisher
American Physical Society
Publication Date
3-13-2009
Rights Information
Copyright (2009) American Physical Society
Rights Holder
American Physical Society
Recommended Citation
Feldman, Daniel; Liu, Zuowei; and Nath, Pran, "PAMELA positron excess as a signal from the hidden sector" (2009). Physics Faculty Publications. Paper 479.
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Notes
Originally published in Physical Review D v.79 (2009): 063509. DOI: 10.1103/PhysRevD.79.063509