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Results are presented from a search for supersymmetric particles in scenarioswith a compressed mass spectrum. The data sample corresponds to 19.7 inversefemtobarns of proton-proton collisions recorded by the CMS experiment atsqrt(s) = 8 TeV. The search targets top squark pair production in scenarioswith mass differences Delta m = m(top squark) - m(neutralino) below the W-bosonmass and with top-squark decays in the four-body mode (top squark to b l nuneutralino), where the neutralino is assumed to be the lightest supersymmetricparticle (LSP). The signature includes a high transverse momentum (pt) jetassociated with initial-state radiation, one or two low-pt leptons, andsignificant missing transverse energy. The event yields observed in data areconsistent with the expected background contributions from standard modelprocesses. Limits are set on the cross section for top squark pair productionas a function of the top squark and LSP masses. Assuming a 100% branchingfraction for the four-body decay mode, top-squark masses below 316 GeV areexcluded for Delta m = 25 GeV at 95% CL. The dilepton data are also interpretedunder the assumption of chargino-neutralino production, with subsequent decaysto sleptons or sneutrinos. Assuming a difference between the common lightestchargino/next lightest neutralino mass and the LSP mass of 20 GeV and atau-enriched decay scenario, masses in the range m(chargino) < 307 GeV areexcluded at 95% CL.

physics letters b

Search for supersymmetry in events with soft leptons, low jet  multiplicity, and missing transverse momentum in proton-proton collisions at  sqrt(s) = 8 TeV