Detection Rates for Kaluza-Klein Dark Matter

TL;DR

The paper investigates whether the lightest Kaluza-Klein particle in a one-extra-dimension universal extra dimensions model ($B^1$) can serve as cold dark matter and yield detectable signals in terrestrial detectors. It derives the WIMP recoil rate $\frac{dR}{dE_R}$ using a scalar WIMP-nucleus cross-section for the LKP, a Maxwellian Galactic halo, and Earth's annual motion, and estimates the local density fraction $\xi$ from GENIUS and DAMA constraints across several values of the degeneracy parameter $d$ and WIMP mass $m_\chi$. Observables for $^{76}$Ge and NaI detectors are computed, showing energy spectra and an annual modulation that peaks in June; rates decrease with increasing $m_\chi$ and depend on $v_0$ and $d$ through $\xi$ and $\sigma_{\rm scalar}^p$. The results yield detector-specific predictions that can be tested by GENIUS, DAMA-like experiments, and other direct-detection programs, thereby probing KK dark matter scenarios.

Abstract

We consider the lightest Kaluza-Klein particle at N=1 mode (LKP) of universal extra dimension to be the candidate for Dark Matter and predict the detection rates for such particles for Germenium and NaI detectors. We have also calculated the nature of annual modulation for the signals in these two types of detectors for LKP Dark Matter. The rates with different values of speed of solar system in the Galactic rest frame are also evaluated.