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.
Highlights
Dark matter (DM) is one of the firm pieces of evidence of physics beyond the Standard Model (BSM)
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 and spin-0 state
We show that the mono-Z channel can be used at the Large Hadron Collider (LHC) to diagnose whether a DM signal is characterized within the BLSSM by a fermionic orscalar DM particle
Summary
Dark matter (DM) is one of the firm pieces of evidence of physics beyond the Standard Model (BSM). We expand on all these results, by showing that DM spin can be accessed at the LHC in the mono-Z channel We prove this result by showing that the angular distributions of the final state lepton emerging from a subsequent Z decay, for both neutralino and right-handed sneutrino DM, are significantly different from each other. This is in contrast to the result that these distributions are identical in monojet, monophoton, and mono-Higgs (owing to the fact that jets and γ’s do not couple directly to DM while Higgs radiation is isotropic), being insensitive to the DM spin.
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