Precise calculation of the relic density of Kaluza-Klein dark matter in universal extra dimensions

By Kyoungchul Kong, Konstantin T. Matchev. 2005

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We revisit the calculation of the relic density of the lightest Kaluza-Klein particle (LKP) in the model of Universal Extra Dimensions. The Kaluza-Klein (KK) particle spectrum at level one is rather degenerate, and various coannihilation processes may be relevant. We extend the calculation of hep-ph/0206071 to include coannihilation processes with all level one KK particles. In our computation we consider a most general KK particle spectrum, without any simplifying assumptions. In particular, we do not assume a completely degenerate KK spectrum and instead retain the dependence on each individual KK mass. As an application of our results, we calculate the Kaluza-Klein relic density in the Minimal UED model, turning on coannihilations with all level one KK particles. We then go beyond the minimal model and discuss the size of the coannihilation effects separately for each class of level 1 KK particles. Our results provide the basis for consistent relic density computations in arbitrarily general models with Universal Extra Dimenions.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/0d5617354a224359ec41b91f5a9e0cfe37df5df2

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Citations in the corpus

Discrimination of supersymmetry and universal extra dimensions at hadron colliders (2005, background): “in the Minimal UED model, the “good dark matter” region, where the LKP relic density accounts for all of the dark matter component of the Universe, is at R ∼ 500− 600 GeV [39, 43, 44].”
Dark Matter Candidates from Particle Physics and Methods of Detection (2010, background): “The regions of parameter space with the correct B(1) thermal relic density have been investigated in a series of increasingly sophisticated studies (44; 46; 47; 48); the end results are shown in Fig.”
A comprehensive approach to new physics simulations (2009, background): “The comparison has been carried out for the 118 processes in total [165, 166, 167, 184].”
MadDM v.3.0: A comprehensive tool for dark matter studies (2018, background): “The lightest of these KK fields is the level 1 hypercharge gauge boson (B(1)) and is the dark matter candidate [82, 83].”