Changes

==History==

==History==

Before the  [[1970s]], when [[proton]]s and [[neutron]]s were thought to be [[fundamental particle]]s, the phrase "strong force" was what is today known as the [[nuclear force]] or the '''residual strong force'''. What were being observed were the "residual" effects of the strong force, which act on hadrons, both [[baryon]]s and [[meson]]s. This force was postulated to overcome the [[electromagnetism|electric repulsion]] between protons in the [[atomic nucleus|nucleus]], and for its strength (at short distances) it was dubbed the "strong force". After the discovery of quarks, scientists realized that the force was actually acting upon the quarks and gluons making up the protons, not the protons themselves. For some time after this realization, the older notion was referred to as the '''residual strong force''', and the "new" strong interaction was called '''colour force'''.

Before the  [[1970s]], when [[proton]]s and [[neutron]]s were thought to be [[fundamental particle]]s, the phrase "strong force" was what is today known as the [[nuclear force]] or the '''residual strong force'''. What were being observed were the "residual" effects of the strong force, which act on hadrons, both [[baryon]]s and [[meson]]s. This force was postulated to overcome the [[electromagnetism|electric repulsion]] between protons in the [[atomic nucleus|nucleus]], and for its strength (at short distances) it was dubbed the "strong force". After the discovery of quarks, scientists realized that the force was actually acting upon the quarks and gluons making up the protons, not the protons themselves. For some time after this realization, the older notion was referred to as the '''residual strong force''', and the "new" strong interaction was called '''color force'''.

==Details==

==Details==

[[Quantum chromodynamics]], a part of the [[standard model]] of particle physics, is a typical [[non-Abelian]] [[gauge theory]] based on a local (gauge) [[symmetry group]] called [[SU(3)]]. All the particles in this theory interact with each other, through the strong force. The strength of the interaction is parametrized by the strong [[coupling constant]]. This strength is, as usual, modified by the gauge [[coupling constant#Charge, color charge, etc|colour charge]] of the particle. This really refers to a [[Group-theoretic|group theoretical]] property whose meaning is explained in the article on [[color charge]]. Quarks and gluons are the only fundamental particles which carry non-vanishing colour charge, and hence participate in the strong interactions.

[[Quantum chromodynamics]], a part of the [[standard model]] of particle physics, is a typical [[non-Abelian]] [[gauge theory]] based on a local (gauge) [[symmetry group]] called [[SU(3)]]. All the particles in this theory interact with each other, through the strong force. The strength of the interaction is parametrized by the strong [[coupling constant]]. This strength is, as usual, modified by the gauge [[coupling constant#Charge, color charge, etc|color charge]] of the particle. This really refers to a [[Group-theoretic|group theoretical]] property whose meaning is explained in the article on [[color charge]]. Quarks and gluons are the only fundamental particles which carry non-vanishing colour charge, and hence participate in the strong interactions.

==See also==

==See also==