Dark Matter and Collider Physics in Split-UED

TL;DR

This paper explores split-UED models where Kaluza-Klein dark matter explains cosmic ray excesses and predicts observable collider signals, linking astrophysical observations with collider phenomenology.

Contribution

It introduces split-UED as a framework for explaining cosmic ray excesses and predicts specific collider signatures, bridging astrophysics and collider physics.

Findings

Kaluza-Klein dark matter fits cosmic electron and positron excesses.

Gamma-ray flux predictions can be tested with Fermi-LAT data.

Collider signals include dijet resonances and missing energy signatures.

Abstract

Kaluza-Klein dark matter is an attractive weakly interacting massive particle in universal extra dimension model. In the recent extension "split-UED", annihilation of Kaluza-Klein dark matter with a mass range 600-1000 GeV provides excellent fits to the recently observed excesses in cosmic electron and positron fluxes of Pamela, ATIC and Fermi-LAT experiments. The cosmic gamma-ray flux in the same process can be significant around 300 GeV, thus can be observed or constrained by the forthcoming Fermi-LAT diffuse gamma-ray data. The collider signal at the LHC is the resonance in the dijets channels and the large missing energy in the missing energy plus jets.