Global fits of the Minimal Universal Extra Dimensions scenario

TL;DR

This paper performs a Bayesian analysis of the minimal Universal Extra Dimensions model to evaluate the detectability of the gamma_1 dark matter candidate through various experiments, highlighting challenges and prospects for detection.

Contribution

It provides the first comprehensive Bayesian assessment of UED parameter space considering cosmological and collider constraints, focusing on dark matter detection prospects.

Findings

Spin-independent cross section peaks below ton-scale experiment sensitivity.

Neutrino flux from the Sun is too low for current and upcoming neutrino detectors.

LHC can probe the best-fit UED parameters with 1/fb of data.

Abstract

In theories with Universal Extra-Dimensions (UED), the gamma_1 particle, first excited state of the hypercharge gauge boson, provides an excellent Dark Matter (DM) candidate. Here we use a modified version of the SuperBayeS code to perform a Bayesian analysis of the minimal UED scenario, in order to assess its detectability at accelerators and with DM experiments. We derive in particular the most probable range of mass and scattering cross sections off nucleons, keeping into account cosmological and electroweak precision constraints. The consequences for the detectability of the gamma_1 with direct and indirect experiments are dramatic. The spin-independent cross section probability distribution peaks at ~ 10^{-11} pb, i.e. below the sensitivity of ton-scale experiments. The spin-dependent cross-section drives the predicted neutrino flux from the center of the Sun below the reach of present and upcoming experiments. The only strategy that remains open appears to be direct detection with ton-scale experiments sensitive to spin-dependent cross-sections. On the other hand, the LHC with 1 1/fb of data should be able to probe the current best-fit UED parameters.