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A search for supersymmetry in events with two or three low-momentum leptonsand missing transverse momentum is performed. The search uses proton-protoncollisions at $\sqrt{s} =$ 13 TeV collected in the three-year period 2016-2018by the CMS experiment at the LHC and corresponding to an integrated luminosityof up to 137 fb$^{-1}$. The data are found to be in agreement with expectationsfrom standard model processes. The results are interpreted in terms ofelectroweakino and top squark pair production with a small mass differencebetween the produced supersymmetric particles and the lightest neutralino. Forthe electroweakino interpretation, two simplified models are used, a wino-binomodel and a higgsino model. Exclusion limits at 95% confidence level are set on$\widetilde{\chi}^0_2 / \widetilde{\chi}^\pm_1$ masses up to 275 GeV for a massdifference of 10 GeV in the wino-bino case, and up to 205 (150) GeV for a massdifference of 7.5 (3) GeV in the higgsino case. The results for the higgsinoare further interpreted using a phenomenological minimal supersymmetricstandard model, excluding the higgsino mass parameter $\mu$ up to 180 GeV withthe bino mass parameter $M_1$ at 800 GeV. In the top squark interpretation,exclusion limits are set at top squark masses up to 540 GeV for four-body topsquark decays and up to 480 GeV for chargino-mediated decays with a massdifference of 30 GeV.

the journal of high energy physics/the journal of high energy physics

Search for supersymmetry in final states with two or three soft leptons  and missing transverse momentum in proton-proton collisions at $\sqrt{s} =$  13 TeV