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Description
A search for supersymmetric particles produced in the vector boson fusion topology in proton-proton collisions is presented. The search targets final states with one or zero leptons, large missing transverse momentum, and two jets with a large separation in rapidity. The data sample corresponds to an integrated luminosity of 35.9 fb$^{-1}$ of proton-proton collisions at $\sqrt{s}= 13$ TeV collected in 2016 with the CMS detector at the LHC. The observed dijet invariant mass and lepton-neutrino transverse mass spectra are found to be consistent with the standard model predictions. Upper limits are set on the cross sections for chargino ($\tilde\chi^\pm_1$) and neutralino ($\tilde\chi^0_2$) production with two associated jets. For a compressed mass spectrum scenario in which the $\tilde\chi^\pm_1$ and $\tilde\chi^0_2$ decays proceed via a light slepton and the mass difference between the lightest neutralino $\tilde\chi^0_1$ and the mass-degenerate particles $\tilde\chi^\pm_1$ and $\tilde\chi^0_2$ is 1 (30) GeV, the most stringent lower limit to date of 112 (215) GeV is set on the mass of these latter two particles.