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As the quarks within a meson or baryon get closer together, the force of containment gets weaker so that it asymptotically approaches zero for close confinement.
Description of a pion, the lightest of the meson sub-atomic particles
The psi/J particle is a meson which was discovered in 1974 by experimenters at Stanford (Richter) and Brookhaven National Laboratory (Ting).
Hideki Yukawa (1907 - 1981) published a paper in which he proposed a new field theory of nuclear forces and predicted the existence of the meson. He received the Nobel Prize for Physics in 1949.
The upsilon particle is a meson which was discovered at Fermilab in 1977.