Gamma ray lines from a universal extra dimension
- Institut for Theoretical Physics, Univ. of Zürich, Winterthurerst. 190, 8057 Zürich CH (Switzerland)
- Department of Physics, University of Texas at Arlington, Arlington, TX 76019 (United States)
- High Energy Physics Division, Argonne National Laboratory, Argonne, IL 60439 (United States)
- Department of Physics and Astronomy, University of California, Irvine, CA 92697 (United States)
- Center for Particle Astrophysics, Fermi National Accelerator Laboratory, Batavia, IL 60510 (United States)
Indirect Dark Matter searches are based on the observation of secondary particles produced by the annihilation or decay of Dark Matter. Among them, gamma-rays are perhaps the most promising messengers, as they do not suffer deflection or absorption on Galactic scales, so their observation would directly reveal the position and the energy spectrum of the emitting source. Here, we study the detailed gamma-ray energy spectrum of Kaluza-Klein Dark Matter in a theory with 5 Universal Extra Dimensions. We focus in particular on the two body annihilation of Dark Matter particles into a photon and another particle, which produces monochromatic photons, resulting in a line in the energy spectrum of gamma rays. Previous calculations in the context of the five dimensional UED model have computed the line signal from annihilations into γγ, but we extend these results to include γZ and γH final states. We find that these spectral lines are subdominant compared to the predicted γγ signal, but they would be important as follow-up signals in the event of the observation of the γγ line, in order to distinguish the 5d UED model from other theoretical scenarios.
- OSTI ID:
- 22279760
- Journal Information:
- Journal of Cosmology and Astroparticle Physics, Vol. 2012, Issue 03; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
- Country of Publication:
- United States
- Language:
- English
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