Direct Search signal of two-component Dark Matter

TL;DR

This paper explores the possibility of detecting two-component dark matter through a distinctive kink in the nuclear recoil spectrum in direct detection experiments, proposing a specific vector-scalar DM model with a light scalar mediator.

Contribution

It introduces a new two-component dark matter model with a vector and scalar particle, demonstrating how a kink in the recoil spectrum can arise within experimental and theoretical constraints.

Findings

Identified parameter space where the kink signal is observable.

Demonstrated compatibility with relic density, collider, and direct detection constraints.

Provided predictions for experimental signatures of two-component dark matter.

Abstract

How do we know if the dark sector consists of more than one dark matter (DM) component is an important question, for which the answer is not very definite. In this article we study such a possibility in context of direct DM search. It was pointed out earlier in a model independent analysis that a kink in the nuclear recoil energy spectrum may indicate to the presence of two DM components. However, realising one such model was difficult due to experimental constraints. Here we propose and study a model containing a vector boson DM and a scalar DM, aided by a light scalar mediator, where a kink in the nuclear recoil spectrum arises after addressing individual relic densities, direct search limits, collider constraints and theoretical limits. We find out the allowed parameter space of the model and those regions likely to show such distinctive signal.