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Several models of particle physics different from the Standard Model predictthe existence of a dark sector that is weakly coupled to the visible one: thetwo sectors may couple via the vector portal, where a dark photon with mass inthe MeV to GeV range mixes kinetically with the SM photon. If the dark photonis the lightest state in the dark sector, it will decay to SM particles, mainlyto leptons and possibly light mesons. Due to its weak interactions with the SM,it can have a non-negligible lifetime. At the LHC, these dark photons wouldtypically be produced with large boost resulting in collimated jet-likestructures containing pairs of leptons and/or light hadrons, the so-calledLepton-Jets. This work focuses on the search for displaced Lepton-Jets, whichare produced away from the interaction point and their constituents are limitedto electrons, muons, and pions. Results from the analysis of 3.4 fb-1proton-proton collision data sample recorded by ATLAS at a center-of-massenergy of 13 TeV during 2015 are compared to the Standard Model expectationsand with BSM predictions.

Search for long-lived neutral particles decaying into Lepton-Jets with the ATLAS detector in proton-proton collision data at 13 TeV