Discovery of the W particle

Discovery of the W particle at CERN proton-antiproton collider (1982)¹. The proton-antiproton collision creates a W particle which then decays into an high-energy electron, emitted at a wide angle from the beam (indicated by the arrow at the bottom-right) and an invisible neutrino whose presence is deduced by the missing energy of the electron.

1. C. Rubbia. Experimental observation of the intermediate vector bosons W⁺, W^- and Z⁰. Nobel lecture, 8 december 1984 [↩]
2. © CERN [↩]