Search for displaced leptons in $\sqrt{s} = 13$ TeV pp collisions with the ATLAS detector A search for charged leptons with large impact parameters using 139 fb$^{-1}$ of $\sqrt{s} = 13$ TeV $pp$ data from the ATLAS detector at the LHC is presented, addressing a long-standing gap in coverage of possible new physics signatures. Results are consistent with the background prediction. This search provides unique sensitivity to long-lived scalar supersymmetric lepton-partners (sleptons). For 0.1 ns lifetimes selectron, smuon and stau masses up to 720 GeV, 680 GeV, and 340 GeV are excluded, respectively, at 95% CL drastically improving on the previous best limits from LEP. eng 2020

http://cds.cern.ch/record/2738318; http://cds.cern.ch/record/2740685/files/ATLAS-CONF-2020-051.pdf;

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