Again, a W⁺W^- pair is formed in this collision, one of which then decays to a muon (red) and neutrino, and the other to a tau and neutrino. The tau itself decays into three hadrons (green) and a neutrino. All the neutrinos escape from the detector without being seen (except for the momentum they carry which causes the event to look asymmetric).

Notes for experts: The muon is identified by the small amount of energy deposited along its trajectory and the hits in both layers of the barrel muon chambers.