In the 1970s a SU(3) gauge theory was proposed to describe the strong interactions. The fundamental particles out of which hadrons are built are the quarks and the gluons, whose charge, called color, is responsible for the strong interactions. Quarks and gluons belong respectively to the fundamental and adjoint representations of color SU(3), and the theory with this gauge group and particle content is called Quantum Chromo Dynamics (QCD).
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