Quarks were first proposed (theoretically) in 1964 by Murray Gell-Mann and, independently, George Zweig, and later confirmed experimentally in 1968 by Jerome Friedman, Henry Kendall, and Richard Taylor.

Theory: Who “invented” quarks?

  • In 1964, Murray Gell-Mann introduced the quark model to explain patterns in particles called hadrons, proposing that protons and neutrons are built from smaller constituents he named “quarks.”
  • Around the same time, George Zweig independently proposed a very similar idea, calling the constituents “aces,” but the name “quark” became standard.

Experiment: Who “discovered” quarks?

  • From 1968, experiments at the Stanford Linear Accelerator Center (SLAC) by Jerome Friedman, Henry Kendall, and Richard Taylor showed that protons contain point-like constituents, providing strong evidence that quarks are real.
  • These deep inelastic scattering experiments fired high-energy electrons at protons and revealed an internal structure consistent with quarks carrying fractional electric charges.

So who gets the credit?

  • For theoretical discovery , most physicists credit Gell-Mann (and also acknowledge Zweig) for formulating the quark model and naming quarks.
  • For experimental discovery , Friedman, Kendall, and Taylor are credited for confirming quarks’ existence, work that led to the 1990 Nobel Prize in Physics.

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