Search for displaced leptons in the e-mu channel

A search for new long-lived particles decaying to electrons and muons is presented using data from proton-proton collisions produced in 2015 by the LHC at $\sqrt{s}=13\,\mathrm{TeV}{}$. Data used for the analysis were collected by the CMS detector and correspond to an integrated luminosity of $2.6\,\mathrm{fb}^{-1}{}$. Events are selected with an electron and muon that both have transverse impact parameter values between $200\,\mu\mathrm{m}{}$ and $10\,\mathrm{cm}{}$. Since no significant excess is observed, limits are set on the Displaced Supersymmetry model, with pair production of top squarks decaying into an e-mu final state via R-parity-violating interactions. The results are the most restrictive to date on this model. For a top squark mean proper decay length of $2\,\mathrm{cm}{}$, masses below $870\,\mathrm{GeV}{}$ are excluded at 95\% confidence level.