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Several models of elementary particle physics beyond the Standard Model predict the existence of neutral particles that can be long lived and decay in collimated jets of light leptons and hadrons (lepton-jets). The present contribution describes the search for lepton-jets in 20.3/fb of 8 TeV proton-proton collision data recorded at the ATLAS detector in 2012, and compares the selected events with the Standard Model expectations and with various BSM predictions. Prospects for searches with 13 TeV ATLAS data are addressed.

Search for long-lived neutral particles decaying into lepton-jets with the ATLAS Detector