Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-06-17
Phys.Rev.D80:063537,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
9 pages, 4 figures. Version to appear in PRD
Scientific paper
10.1103/PhysRevD.80.063537
We describe a characteristic signature of dark matter (DM) annihilation or decay into gamma-rays. We show that if the total angular momentum of the initial DM particle(s) vanishes, and helicity suppression operates to prevent annihilation/decay into light fermion pairs, then the amplitude for the dominant 3-body final state f^+f^-\gamma has a unique form dictated by gauge invariance. This amplitude and the corresponding energy spectra hold for annihilation of DM Majorana fermions or self-conjugate scalars, and for decay of DM scalars, thus encompassing a variety of possibilities. Within this scenario, we analyze Fermi LAT, PAMELA and HESS data, and predict a hint in future Fermi gamma-ray data that portends a striking signal at atmospheric Cherenkov telescopes (ACTs).
Barger Vernon
Gao Yanfang
Keung Wai-Yee
Marfatia Danny
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