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A data sample of events from proton-proton collisions with at least two jets,and two isolated same-sign or three or more charged leptons, is studied in asearch for signatures of new physics phenomena. The data correspond to anintegrated luminosity of 137 fb$^{-1}$ at a center-of-mass energy of 13 TeV,collected in 2016-2018 by the CMS experiment at the LHC. The search isperformed using a total of 168 signal regions defined using several kinematicvariables. The properties of the events are found to be consistent with theexpectations from standard model processes. Exclusion limits at 95% confidencelevel are set on cross sections for the pair production of gluinos or squarksfor various decay scenarios in the context of supersymmetric models conservingor violating R parity. The observed lower mass limits are as large as 2.1 TeVfor gluinos and 0.9 TeV for top and bottom squarks. To facilitatereinterpretations, model-independent limits are provided in a set of simplifiedsignal regions.

european physical journal. c, particles and fields

Search for physics beyond the standard model in events with jets and two  same-sign or at least three charged leptons in proton-proton collisions at  $\sqrt{s} =$ 13 TeV