discovered from subsequent data in 1977 at a higher mass of 9.5 GeV.

As the director of Fermilab, Lederman was a prominent supporter of the Superconducting Super Collider project, which was endorsed around 1983, and was a major proponent and advocate throughout its lifetime. Also at Fermilab, he oversaw the construction of the Tevatron, for decades the world's highest-energy particle collider. Lederman later wrote