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Generic dark matter signature for gamma-ray telescopes · Around

2009

Generic dark matter signature for gamma-ray telescopes

Barger, V., Gao, Y., Keung, W. -Y. et al.

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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).

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