Lattice calculation of composite dark matter form factors

TL;DR

This paper uses lattice calculations to determine electromagnetic form factors of composite dark matter candidates, providing insights into their detection prospects and constraining their mass range based on experimental data.

Contribution

It presents the first lattice computation of electromagnetic form factors for electroweak-neutral composite dark matter baryons in a QCD-like theory with Nf=2 and 6.

Findings

Charge radius and magnetic moment show minimal Nf dependence.

Dark matter candidates below 10 TeV are excluded by XENON100 data.

Mass-dependent cross-sections inform direct detection constraints.

Abstract

Composite dark matter candidates, which can arise from new strongly-coupled sectors, are well-motivated and phenomenologically interesting, particularly in the context of asymmetric generation of the relic density. In this work, we employ lattice calculations to study the electromagnetic form factors of electroweak-neutral dark-matter baryons for a three-color, QCD-like theory with Nf = 2 and 6 degenerate fermions in the fundamental representation. We calculate the (connected) charge radius and anomalous magnetic moment, both of which can play a significant role for direct detection of composite dark matter. We find minimal Nf dependence in these quantities. We generate mass-dependent cross-sections for dark matter-nucleon interactions and use them in conjunction with experimental results from XENON100, excluding dark matter candidates of this type with masses below 10 TeV.