Definitions for quantum chromodynamicsˌkroʊ moʊ daɪˈnæm ɪks
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quantum chromodynamics, QCD(noun)
a theory of strong interactions between elementary particles (including the interaction that binds protons and neutrons in the nucleus); it assumes that strongly interacting particles (hadrons) are made of quarks and that gluons bind the quarks together
A quantum field theory in particle physics which describes the strong interaction of quarks and gluons employing the concept of color charge.
In theoretical physics, quantum chromodynamics is a theory of the strong interaction, a fundamental force describing the interactions between quarks and gluons which make up hadrons. It is the study of the SU Yang–Mills theory of color-charged fermions. QCD is a quantum field theory of a special kind called a non-abelian gauge theory, consisting of a 'color field' mediated by a set of exchange particles. The theory is an important part of the Standard Model of particle physics. A huge body of experimental evidence for QCD has been gathered over the years. QCD enjoys two peculiar properties: ⁕Confinement, which means that the force between quarks does not diminish as they are separated. Because of this, it would take an infinite amount of energy to separate two quarks; they are forever bound into hadrons such as the proton and the neutron. Although analytically unproven, confinement is widely believed to be true because it explains the consistent failure of free quark searches, and it is easy to demonstrate in lattice QCD. ⁕Asymptotic freedom, which means that in very high-energy reactions, quarks and gluons interact very weakly. This prediction of QCD was first discovered in the early 1970s by David Politzer and by Frank Wilczek and David Gross. For this work they were awarded the 2004 Nobel Prize in Physics.
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"quantum chromodynamics." Definitions.net. STANDS4 LLC, 2015. Web. 28 Nov. 2015. <http://www.definitions.net/definition/quantum chromodynamics>.