Carlo Rubbia
active c. 1934, Gorizia, Italy
Italian particle physicist who conceived and led the UA1 experiment at CERN that discovered the W and Z bosons in 1983.
Trained at Pisa's Scuola Normale, Rubbia worked on early neutrino experiments at Columbia and CERN before proposing the boldest gamble in collider history: converting CERN's SPS into a proton-antiproton collider, made feasible by van der Meer's stochastic cooling. The UA1 detector he led found the W in January 1983 and the Z four months later. He later served as CERN Director-General and advocated the energy-amplifier concept for nuclear power.
Nobel-winning work
Rubbia shared the 1984 Nobel Prize for 'decisive contributions to the project which led to the discovery of the field particles W and Z, communicators of weak interaction'. He originated the idea of colliding protons and antiprotons in the SPS at √s ≈ 540 GeV, and drove the UA1 experiment — a 2000-ton detector combining tracking, calorimetry and muon detection.
In early 1983 UA1 recorded isolated high-energy electrons recoil against nothing visible — the signature of W → eν — followed by clean e⁺e⁻ and μ⁺μ⁻ pairs at the Z mass. Both masses matched the electroweak predictions, sealing the Standard Model's victory a year before the theory's Nobel itself.
Workplaces: CERN, Harvard University
Italy