Search for chargino pair production and top squark pair production in final states with two leptons in proton-proton collisions at $\sqrt{s}=13~\mathrm{TeV}$

A search for pair production of supersymmetric particles in events with two leptons (electrons or muons) and missing transverse momentum is reported. The data sample corresponds to $35.9~\mathrm{fb}^{-1}$ of proton-proton collisions at $\sqrt{s}=13~\mathrm{TeV}$ collected by the CMS detector during the 2016 data taking period at the CERN LHC. The search targets two signal models for chargino and top squark pair production. No significant deviation is observed from the predicted background. The results are interpreted in terms of several simplified models assuming R-parity conservation and with the neutralino as the lightest supersymmetric particle. When the chargino is assumed to undergo a cascade decay through sleptons, exclusion limits at $95\%$ confidence level are set on the mass of the chargino up to 800 GeV and on the mass of the neutralino up to 320 GeV. For the top squark production, the search focuses on models with a small mass difference between the top squark and the lightest neutralino. When the top squark decays into an off-shell top quark and a neutralino, the limits extend up to 420 and 360 GeV for the top squark and neutralino masses, respectively.