Full one-loop corrections to the relic density in the MSSM: A few examples

TL;DR

This paper evaluates the significant one-loop electroweak and QCD corrections to the neutralino relic density in the MSSM, emphasizing their importance for precise dark matter predictions.

Contribution

It introduces a new automatic tool for one-loop calculations in the MSSM with a flexible, gauge-invariant renormalisation scheme, including different tan beta schemes.

Findings

Corrections can be large and impact relic density predictions

The tool enables comprehensive and precise one-loop calculations in the MSSM

Different renormalisation schemes affect the results significantly

Abstract

We show the impact of the electroweak, and in one instance the QCD, one-loop corrections on the relic density of dark matter in the MSSM which is provided by the lightest neutralino. We cover here some of the most important scenarii: annihilation into fermions for a bino-like neutralino, annihilation involving gauge bosons in the case of a mixed neutralino, the neutralino-stau co-annihilation region and annihilation into a bottom quark pair. The corrections can be large and should be taken into account in view of the present and forthcoming increasing precision on the relic density measurements. Our calculations are made possible thanks to a newly developed automatic tool for the calculation at one-loop of any process in the MSSM. We have implemented a complete on-shell gauge invariant renormalisation scheme, with the possibility of switching to other schemes. In particular we will report on the impact of different renormalisation schemes for tan beta.