Characterising Dark Matter Interacting with Extra Charged Leptons

TL;DR

This paper explores how to determine the nature of dark matter and its mediator in a leptophilic model by combining cosmological, flavour, and collider data, providing a comprehensive analysis of the parameter space.

Contribution

It introduces a simplified leptophilic dark matter model with a charged fermion mediator and demonstrates how to distinguish dark matter spin and mediator type using multiple data sources.

Findings

Potential to identify dark matter spin as scalar or vector

Ability to characterize the mediator's nature

Numerical analysis of viable parameter space benchmarks

Abstract

In the context of a simplified leptophilic Dark Matter (DM) scenario where the mediator is a new charged fermion carrying leptonic quantum number and the DM candidate is either scalar or vector, the complementarity of different bounds is analysed. In this framework, the extra lepton and DM are odd under a $\mathbb Z_2$ symmetry, hence the leptonic mediator can only interact with the DM state and Standard Model (SM) leptons of various flavours. We show that there is the possibility to characterise the DM spin (scalar or vector), as well as the nature of the mediator, through a combined analysis of cosmological, flavour and collider data. We present an explicit numerical analysis for a set of benchmarks points of the viable parameter space of our scenario.