Forty years ago, in 1979, experiments at the DESY laboratory in Germany provided the first direct proof of the existence of gluons—the carriers of the strong force that “glue” quarks into protons, neutrons and other particles known collectively as hadrons. This discovery was a milestone in the history of particle physics, as it helped establish the theory of the strong force, known as quantum chromodynamics.
Click here for original story, How a walk through CERN’s corridors helped lead to the discovery of the gluon 40 years ago
Source: Phys.org