Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-12-22
JCAP 1003:024,2010
Physics
High Energy Physics
High Energy Physics - Phenomenology
28 pages, 8 figures, version to appear in JCAP
Scientific paper
10.1088/1475-7516/2010/03/024
Scenarios with hidden, spontaneously broken, non-abelian gauge groups contain a natural dark matter candidate, the hidden vector, whose longevity is due to an accidental custodial symmetry in the renormalizable Lagrangian. Nevertheless, non-renormalizable dimension six operators break the custodial symmetry and induce the decay of the dark matter particle at cosmological times. We discuss in this paper the cosmic ray signatures of this scenario and we show that the decay of hidden vector dark matter particles generically produce an intense gamma ray line which could be observed by the Fermi-LAT experiment, if the scale of custodial symmetry breaking is close to the Grand Unification scale. This gamma line proceeds directly from a tree level dark matter 2-body decay in association with a Higgs boson. Within this model we also perform a determination of the relic density constraints taking into account the dark matter annihilation processes with one dark matter particle in the final state. The corresponding direct detection rates can be easily of order the current experimental sensitivities.
Arina Chiara
Hambye Thomas
Ibarra Alejandro
Weniger Christoph
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