Relic density at one-loop with gauge boson pair production

TL;DR

This paper calculates full one-loop electroweak and QCD corrections to dark matter relic density processes in the MSSM, focusing on gauge boson pair production channels for light neutralino dark matter, highlighting their importance for precision predictions.

Contribution

It provides the first comprehensive one-loop correction analysis for relic density calculations in MSSM with gauge boson pair production, using the automated exttt{ extbackslash SloopS} tool.

Findings

One-loop corrections significantly affect relic density predictions.

Corrections are relevant for light neutralino dark matter scenarios.

Renormalisation scheme dependence on gb h is analyzed.

Abstract

We have computed the full one-loop corrections (electroweak as well as QCD) to processes contributing to the relic density of dark matter in the MSSM where the LSP is the lightest neutralino. We cover scenarios where the most important channels are those with gauge boson pair production. This includes the case of a bino with some wino admixture, a higgsino and a wino. In this paper we specialise to the case of light dark matter much below the TeV scale. The corrections can have a non-negligible impact on the predictions and should be taken into account in view of the present and forthcoming increasing precision on the relic density measurements. Our calculations are made with the help of \SloopS, an automatic tool for the calculation of one-loop processes in the MSSM. The renormalisation scheme dependence of the results as concerns $\tgb$ is studied.