Collider Signatures of Near-Continuum Dark Matter

TL;DR

This paper explores a five-dimensional near-continuum dark matter model with a tower of states, analyzing collider signatures such as cascade decays, high multiplicity events, and displaced vertices, using custom simulation tools.

Contribution

It introduces a novel five-dimensional model of near-continuum dark matter and provides detailed collider signature simulations with a custom Monte Carlo tool.

Findings

Cascade decay signatures with high multiplicity of jets and leptons

Large missing energy and displaced vertices in collider events

Simulation results for electron-positron collision scenarios

Abstract

In this paper we study a near-continuum dark matter model, in which dark sector consists of a tower of closely spaced states with weak-scale masses. We construct a five-dimensional model which naturally realizes this spectrum. The dark matter is described by a bulk field, which interacts with the brane-localized Standard Model sector via a Z portal. We then study collider signatures of this model. Near-continuum dark matter states produced in a collider undergo cascade decays, resulting in events with high multiplicity of jets and leptons, large missing energy, and displaced vertices. A custom-built Monte Carlo tool described in this paper allows for detailed simulation of the signal events. We present results of such simulations for the case of electron-positron collisions.