50 years ago, physicists got a whiff of what glues together protons
Excerpt from the September 16, 1972 issue of Science News
In this illustration of a proton’s internal structure, quarks (represented by the letters U and D) are held together by the strong nuclear force (helices), which is imparted by particles called gluons.
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What holds the proton together— Science News, September 16, 1972
An experiment … at the CERN Laboratory in Geneva … gives an important clue to structural arrangements deep within the proton….