quantum chromodynamics
Sign in to savetheory of strong interactions, a fundamental force describing the interactions between quarks and gluons, which make up hadrons such as the proton, neutron and pion
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Quantum chromodynamics is the theory that explains how quarks and gluons interact through the strong force, which is one of the fundamental forces of nature. This theory matters because it describes how quarks and gluons combine to form hadrons like protons and neutrons, which are the building blocks of all atoms and therefore all ordinary matter.
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In theoretical physics, quantum chromodynamics (QCD) is the study of the strong interaction between quarks mediated by gluons. Quarks are fundamental particles that make up composite hadrons such as the proton, neutron and pion. QCD is a type of quantum field theory called a non-abelian gauge theory, with symmetry group SU(3). The QCD analog of electric charge is a property called color. Gluons are the force carriers of the theory, just as photons are for the electromagnetic force in quantum electrodynamics. The theory is an important part of the Standard Model of particle physics. A large body of experimental evidence for QCD has been gathered over the years.
QCD exhibits three salient properties: