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We investigate monoenergetic gamma-ray signatures from annihilations of darkmatter comprised of Z^1, the first Kaluza-Klein excitation of the Z boson, in anon-minimal Universal Extra Dimensions model. The self-interactions of thenon-Abelian Z^1 gauge boson give rise to a large number of contributing Feynmandiagrams that do not exist for annihilations of the Abelian gauge boson B^1,which is the standard Kaluza-Klein dark matter candidate. We find that theannihilation rate is indeed considerably larger for the Z^1 than for the B^1.Even though relic density calculations indicate that the mass of the Z^1 shouldbe larger than the mass of the B^1, the predicted monoenergetic gamma fluxesare of the same order of magnitude. We compare our results to existingexperimental limits, as well as to future sensitivities, for image airCherenkov telescopes, and we find that the limits are reached already with amoderately large boost factor. The realistic prospects for detection depend onthe experimental energy resolution.

Monoenergetic Gamma-Rays from Non-Minimal Kaluza-Klein Dark Matter Annihilations