Pion Structure at High and Low Energies in Chiral Quark Models

Abstract

Low and high energy properties of the pion are reviewed in the framework of chiral quark models. Particular emphasis is put on the simplest version of the SU(2) NJL model as prototype. The role of gauge invariance in this kind of calculations is stressed. The results are used as initial conditions for perturbative QCD evolution equations. At leading order the quark model scale is ${\mu }_0\sim 320\mathrm{MeV}$ as determined from the pion distribution functions and the pion distribution amplitudes.

arXiv comment36 pages, 11 figures; Lectures given at the XLII Krakow School on Theoretical Physics (Zakopane), May 31st-June 9th 2002

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