Search for Displaced Supersymmetry in Events with an Electron and a Muon with Large Impact Parameters
Аннотация
A search for new long-lived particles decaying to leptons is presented using proton-proton collisions produced by the LHC at $\sqrt{s}=8\text{ }\text{ }\mathrm{TeV}$. Data used for the analysis were collected by the CMS detector and correspond to an integrated luminosity of $19.7\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$. Events are selected with an electron and muon with opposite charges that both have transverse impact parameter values between 0.02 and 2 cm. The search has been designed to be sensitive to a wide range of models with nonprompt $e\text{\ensuremath{-}}\ensuremath{\mu}$ final states. Limits are set on the ``displaced supersymmetry'' model, with pair production of top squarks decaying into an $e\text{\ensuremath{-}}\ensuremath{\mu}$ final state via $R$-parity-violating interactions. The results are the most restrictive to date on this model, with the most stringent limit being obtained for a top squark lifetime corresponding to $c\ensuremath{\tau}=2\text{ }\text{ }\mathrm{cm}$, excluding masses below 790 GeV at 95% confidence level.
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