Neutralino relic density from ILC measurements in the CPV MSSM

TL;DR

This paper explores how measurements at the International Linear Collider can determine the neutralino relic density in a CP-violating MSSM scenario, highlighting the potential and limitations of collider data in dark matter predictions.

Contribution

It demonstrates how ILC measurements can be used to estimate the neutralino relic density in a CPV MSSM, including the impact of CP phases and collider energy upgrades.

Findings

Collider prediction of relic density: 0.116<Omega h^2<0.19 at 95% CL

CP-odd observables do not significantly constrain Omega h^2

Higher energy collider measurements can improve relic density predictions

Abstract

We discuss ILC measurements for a specific MSSM scenario with CP phases, where the lightest neutralino is a good candidate for dark matter, annihilating efficiently through t-channel exchange of light staus. These prospective (CP-even) ILC measurements are then used to fit the underlying model parameters. A collider prediction of the relic density of the neutralino from this fit gives 0.116<Omega h^2<0.19 at 95% CL. CP-odd observables, while being a direct signal of CP violation, do not help in further constraining Omega h^2. The interplay with (in)direct detection of dark matter and with measurements of electric dipole moments is also discussed. Finally we comment on collider measurements at higher energies for refining the prediction of Omega h^2.