what is quantum chromodynamics
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Answer:
a quantum field theory in which the strong interaction is described in terms of an interaction between quarks mediated by gluons, both quarks and gluons being assigned a quantum number called ‘colour’.
Answer:
Quantum chromodynamics (QCD), in physics, the theory that describes the action of the strong force. QCD was constructed in analogy to quantum electrodynamics (QED), the quantum field theory of the electromagnetic force. In QED the electromagnetic interactions of charged particles are described through the emission and subsequent absorption of massless photons, best known as the “particles” of light; such interactions are not possible between uncharged, electrically neutral particles. The photon is described in QED as the “force-carrier” particle that mediates or transmits the electromagnetic force. By analogy with QED, quantum chromodynamics predicts the existence of force-carrier particles called gluons, which transmit the strong force between particles of matter that carry “colour,” a form of strong “charge.” The strong force is therefore limited in its effect to the behaviour of elementary subatomic particles called quarks and of composite particles built from quarks—such as the familiar protons and neutrons that make up atomic nuclei, as well as more-exotic unstable particles called mesons.