What is QCD? – More technically…
•QCD is a non-Abelian Gauge Theory.
•The gauge group is SU(3).
•The Quarks carry the fundamental representation 3.
•The Gluons, which transmit the forces between quarks, carry the adjoint representation 8.
•3 has triality, 8 has no triality.
•The theory has defied analytical results despite the best efforts for more than 25 years.
•It is an outstanding problem of theoretical physics.
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