The scattering particle only sees the valence partons. At higher energies, the scattering particles also detects the sea partons. Parton showers are simulated extensively in Monte Carlo, in order to calibrate and interpret (and thus understand) processes in collider experiments. As such, the name is also used to refer to algorithms that approximate or simulate the process. Motivation [ ] The parton model was proposed by in 1969 as a way to analyze high-energy hadron collisions. Any hadron (for example, a ) can be considered a composition of a number of point-like constituents, termed 'partons'. The parton model was immediately applied to - by and Paschos.

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Component particles [ ] A hadron is composed of a number of point-like constituents, termed 'partons'. Later, with the experimental observation of, the validation of the, and the confirmation of in, partons were matched to. The parton model remains a justifiable approximation at high energies, and others have extended the theory over the years. [ ] Just as accelerated electric charges emit QED radiation (photons), the accelerated coloured partons will emit QCD radiation in the form of gluons.

Unlike the uncharged photons, the gluons themselves carry colour charges and can therefore emit further radiation, leading to parton showers. Reference frame [ ]. See also: The is defined in a where it has infinite momentum—a valid approximation at high energies. Thus, parton motion is slowed by, and the hadron charge distribution is, so incoming particles will be scattered 'instantaneously and incoherently'.

[ ] Partons are defined with respect to a physical scale (as probed by the inverse of the momentum transfer). [ ] For instance, a quark parton at one length scale can turn out to be a superposition of a quark parton state with a quark parton and a gluon parton state together with other states with more partons at a smaller length scale. Similarly, a gluon parton at one scale can resolve into a superposition of a gluon parton state, a gluon parton and quark-antiquark partons state and other multiparton states. Because of this, the number of partons in a hadron actually goes up with momentum transfer.

At low energies (i.e. Large length scales), a baryon contains three valence partons (quarks) and a meson contains two valence partons (a quark and an antiquark parton).

At higher energies, however, observations show sea partons (nonvalence partons) in addition to valence partons. History [ ] The parton model was proposed by in 1969, used originally for analysis of high-energy collisions. It was applied to / by and Paschos. Later, with the experimental observation of, the validation of the, and the confirmation of in, partons were matched to quarks and gluons. The parton model remains a justifiable approximation at high energies, and others have extended the theory over the years [ ].

It was recognized [ ] that partons describe the same objects now more commonly referred to as. A more detailed presentation of the properties and physical theories pertaining indirectly to partons can be found under.

Parton distribution functions [ ].