Parton Distributions, Logarithmic Expansions and Kinetic Evolution

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Aspects of the QCD parton densities are briefly reviewed, drawing some parallels to the density matrix formulation of quantum mechanics, exemplified by Wigner functions. We elaborate on the solution of their evolution equations using logarithmic expansions and overview their kinetic interpretation. We illustrate how a Fokker-Planck equation can be derived using the master formulation of the same equations and its construction in the case of the transverse spin distributions. A simple connection of the leading order DGLAP equation to fractional diffusion using fractional calculus is also briefly outlined.
Review article to appear in Lecture Notes of SIM (S. Dragomir ed.) 32 pages, 1 figure

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High Energy Physics - Phenomenology

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http://salesiana.dossiersoluciones.com/handle/123456789/108731

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/hep-ph/0602173
 http://arxiv.org/abs/hep-ph/0602173

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arXiv