Answer
Samuel C. C. Ting won the Nobel Prize in Physics in 1976 for discovering the subatomic J/ψ particle. The J/ψ particle is a meson, which is a composite particle made of two quarks. The J/ψ particle is the first meson that was discovered that is made of two heavy quarks, and its discovery helped to confirm the existence of quarks and the quark model of matter.