Quantum chromodynamics is the theory of strong interactions from "summary" of The Quantum Theory of Fields by Steven Weinberg,Weinberg S
In the theory of strong interactions, the basic constituents of matter, quarks, are held together by the exchange of particles called gluons. The theory that describes the strong interactions of quarks and gluons is called quantum chromodynamics (QCD). Unlike the electromagnetic force, which weakens as charged particles move farther apart, the strong force remains constant over large distances. This is due to the fact that the force between quarks does not decrease with distance, but rather increases. The strength of the strong force is described by a parameter called the coupling constant, which measures how strongly quarks interact with each other through the exchange of gluons. At short distances, the coupling constant is small, allowing perturbation theory to be used to make precise calculations of strong interaction processes. However, at large distances, the coupling constant becomes large, leading to the phenomenon of confinement, where quarks are never found in isolation but are always bound together in composite particles such as protons and neutrons. One of the ...
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