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High Energy, Nuclear, Particle Physics
How to understand Proton Structure-function (pdf)
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[QUOTE="vanhees71, post: 6571324, member: 260864"] The four images depict descriptions on different scales of resolution the partonic structure of the proton. It's investigated in scattering of electrons on a proton. The higher the scattering energy is the more "microscopic details" of the scattering object is revealed. At low energies one can well described the scattering as Coulomb scattering, i.e., describing the proton by a point-particle Coulomb potential. At somewhat higher energies one finds that there is a "form factor", i.e, a deviation from a pure point-particle Coulomb potential indicating that the Proton is an extended object with a corresponding charge distribution. Going even higher in energy, one finds a cross section that is explained by the assumption that the proton consists of 3 point-like constituent quarks. Going even higher reveals that there are also sea quarks and antiquarks. From QCD it's also clear that there must be gluon fields too, and in fact QCD has been discovered from the investigation of this deep inelastic scattering of electrons and protons (starting with the discovery of Bjorken scaling at SLAC and Feynman's explanation in terms of the "parton model"). [/QUOTE]
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Physics
High Energy, Nuclear, Particle Physics
How to understand Proton Structure-function (pdf)
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