Gluon contribution to the dark matter direct detection

TL;DR

This paper calculates the spin-independent nucleon-dark matter scattering cross section at loop level, focusing on gluon contributions, to improve understanding of dark matter detection in supersymmetric models.

Contribution

It systematically evaluates gluon loop diagrams and their contributions to the scattering cross section, providing a detailed calculation relevant for dark matter direct detection.

Findings

Calculated the loop-level cross section including gluon contributions

Analyzed the dominant loop momentum scales for accurate results

Applicable to bino and wino dark matter in supersymmetry

Abstract

In this article we have calculated the spin-independent cross section of nucleon-dark matter scattering process at loop level, which is relevant to dark matter direct detection. Paying particular attention to the scattering of gluon with dark matter, which contributes as leading order in the perturbation, we have systematically evaluated loop diagrams with tracking the characteristic loop momentum which dominates in the loops. Here loop diagrams whose typical loop momentum scales are the masses of quarks and other heavier particles are separately presented. Then, we have properly taken into account each contribution to give the cross section. We assume that the dark matter is pure bino or wino in the supersymmetric models. The application to other models is straightforward.