2011
Generic dark matter signature for gamma-ray telescopes
by
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Pacific/Honolulu
417 (Watanabe Hall)
417
Watanabe Hall
Description
SPECIAL HIGH ENERGY PHYSICS SEMINAR
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 e+e- 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).
In charge: Xerxes Tata