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The identity of Dark Matter (DM) is one of the most active topics in particlephysics today. Supersymmetry (SUSY) is an extension of the standard model (SM)that could describe the particle nature of DM in the form of the lightestneutralino in R-parity conserving models. We focus on SUSY models that solvethe hierarchy problem with small fine tuning, and where the lightest SUSYparticles ($\tilde{\chi}_{1}^{0}$, $\tilde{\chi}_{1}^{\pm}$,$\tilde{\chi}_{2}^{0}$) are a triplet of higgsino-like states, such that themass difference $\Delta m(\tilde{\chi}^{0}_{2},\tilde{\chi}^{0}_{1})$ is 2-50GeV. We perform a feasibility study to assess the long-term discovery potentialfor these compressed SUSY models with higgsino-like states, using vector bosonfusion (VBF) processes in the context of proton-proton collisions at $\sqrt{s}= 13$ TeV, at the CERN Large Hadron Collider. Assuming an integrated luminosityof 3000 fb$^{-1}$, we find that stringent VBF requirements, combined with largemissing momentum and one or two low-$p_{T}$ leptons, is effective at reducingthe major SM backgrounds, leading to a 5$\sigma$ (3$\sigma$) discovery reachfor $m(\tilde{\chi}^{0}_{2}) < 180$ $(260)$ GeV, and a projected 95\%confidence level exclusion region that covers $m(\tilde{\chi}^{0}_{2})$ up to385 GeV, parameter space that is currently unconstrained by other experiments.

Long-term LHC Discovery Reach for Compressed Higgsino-like Models using VBF Processes