ATLAS Event Display: Tau-lepton pair produced in heavy-ion collisions

A collision event captured by the ATLAS detector during 2018 heavy-ion collisions featuring a muon (red line), three low-energy charged particles (yellow lines) and no other activity in the detector. The signature is consistent with two-photon production of the tau-lepton pair. One of the tau leptons subsequently decays into a muon, while the other decays into three charged pions that are seen in the detector.