Search for Displaced SUSY in Dilepton Final States

We present a search for new physics producing lepton pairs whose trajectories are displaced from the interaction region. This search uses a data sample obtained from pp collisions at $\sqrt{s}=8\,\mathrm{TeV}{}$, with an integrated luminosity of $19.7\,\mathrm{fb}^{-1}{}$, recorded by the CMS detector at the LHC. Many models of new physics predict particles with lifetimes on the scale that would produce detectable displacements of the decay products on the order of $100\,\mu\mathrm{m}{}$-$2\,\mathrm{cm}{}$. We target a particular model called ``Displaced Supersymmetry" but have designed the search to remain sensitive to a wide variety of such theoretical scenarios. The number of observed events is in agreement with the background expectation, and limits are placed on the pair production of stop squarks decaying to final states including an electron and muon, for a range of stop lifetimes between $100\,\mu\mathrm{m}/c{}$ and $10\,\mathrm{cm}/c{}$. At a mean stop lifetime of $2\,\mathrm{cm}/c{}$ --- the value that gives the highest mass exclusion --- stop squarks with masses below $790\,\mathrm{GeV}{}$ are excluded at 95\% confidence level.