# Dark Matter Spin Characterisation in Mono-$Z$ Channels

## TL;DR

This paper explores how the mono-$Z$ channel at the LHC can distinguish between fermionic and scalar dark matter candidates within the BLSSM model using current collider data.

## Contribution

It demonstrates the potential of mono-$Z$ searches at the LHC to identify the spin nature of dark matter in the BLSSM framework.

## Key findings

- Sensitivity achievable with 100 fb$^{-1}$ of data.
- Mono-$Z$ channel can differentiate fermionic vs scalar DM.
- Method applicable after LHC Runs 2 and 3.

## Abstract

The $B-L$ Supersymmetric Standard Model (BLSSM) is an ideal testing ground of the spin nature of Dark Matter (DM) as it offers amongst its candidates both a spin-1/2 (the lightest neutralino) and spin-0 (the lightest right-handed sneutrino) state. We show that the mono-$Z$ channel can be used at the Large Hadron Collider (LHC) to diagnose whether a DM signal is characterised within the BLSSM by a fermionic or (pseudo)scalar DM particle. Sensitivity to either hypothesis can be obtained after only 100 fb$^{-1}$ of luminosity following Runs 2 and 3 of the LHC.