Minimal Dark Matter bound states at future colliders

TL;DR

This paper explores the formation and detection of electroweak bound states of minimal dark matter multiplets at future colliders, especially muon colliders, highlighting their potential to reveal dark matter properties.

Contribution

It predicts the existence of electroweak bound states for minimal dark matter candidates and analyzes their production and detection prospects at future colliders.

Findings

Bound states can be produced resonantly at lepton colliders.

A muon collider could resolve three such bound states.

Production rates are large enough to study dark matter spectroscopy.

Abstract

The hypothesis that Dark Matter is one electroweak multiplet leads to predictive candidates with multi-TeV masses that can form electroweak bound states. Bound states with the same quantum numbers as electroweak vectors are found to be especially interesting, as they can be produced resonantly with large cross sections at lepton colliders. Such bound states exist e.g. if DM is an automatically stable fermionic weak 5-plet with mass $M \approx$ 14 TeV such that the DM abundance is reproduced thermally. In this model, a muon collider could resolve three such bound states. Production rates are so large that details of DM spectroscopy can be probed with larger statistics: we compute the characteristic pattern of single and multiple $\gamma$ lines.