Dark Matter Spin Characterisation in Mono-$Z$ Channels

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.

Comments: 6 pages, 6 figures, 2 tables, Fig. 5 and table 2 have been added. Final results and conclusions unchanged. Version to appear in PRD