ARGUS (A R ussian- G erman- U nited States- S wedish Collaboration; later joined by Canada and the former Yugoslavia) was a particle physics experiment that ran at the electron – positron collider ring DORIS II at the German national laboratory DESY. Its aim was to explore properties of charm and bottom quarks. Its construction started in 1979, the detector was commissioned in 1982 and operated until 1992.