Quantum chromodynamics

In particle physics, Qquantum chromodynamics (abbreviated as QCD) is a specific kind of quantum field theory which supposes that fundamental particles or hadrons (such as protons and neutrons) are made up of quarks and gluons which interact while they also have a kind of charge named "colour" (though these are not real colours). For the quarks, three colours are disinguished; red, green an blue. The colour of a quark's anti-particle partner is known as anti-red, anti-green or anti-blue.

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Since the 1950s, experimental tests have been carried out which have confirmed many aspects of QCD.