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Higher Twists in the Pion Structure Function

By W. Melnitchouk


We calculate the QCD moments of the pion structure function using Drell-Yan data on the quark distributions in the pion and a phenomenological model for the resonance region. The extracted higher twist corrections are found to be larger than those for the nucleon, contributing around 50 % of the lowest moment at Q 2 = 1 GeV 2. Understanding the structure of the pion represents a fundamental challenge in QCD. As the lightest q¯q bound state, the pion presents itself as somewhat of a dichotomy: on the one hand, its anomalously small mass suggests that it should be identified with the pseudo-Goldstone mode of dynamical breaking of chiral symmetry in QCD, essential for describing the long-range structure and interactions of hadrons; on the other, high energy scattering experiments reveal a rich substructure which can be efficiently described in terms of current quarks and gluons. The duality between quark and hadron degrees of freedom reveals itself in most spectacular fashion through the phenomenon of Bloom-Gilman duality in inclusive deep-inelasti

Year: 2003
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