Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-10-25
Fizika B13:91-114,2004
Physics
High Energy Physics
High Energy Physics - Phenomenology
LaTex, 33 pages. Invited talk presented at the 2nd Conference On Nuclear And Particle Physics With CEBAF At Jlab (NAPP 2003) %
Scientific paper
The effective QCD charge extracted from $\tau$ decay is remarkably constant at small momenta, implying the near-conformal behavior of hadronic interactions at small momentum transfer. The correspondence of large-$N_C$ supergravity theory in higher-dimensional anti-de Sitter spaces with gauge theory in physical space-time also has interesting implications for hadron phenomenology in the conformal limit, such as constituent counting rules for hard exclusive processes. The utility of light-front quantization and light-front Fock wavefunctions for analyzing such phenomena and representing the dynamics of QCD bound states is reviewed. I also discuss the novel effects of initial- and final-state interactions in hard QCD inclusive processes, including Bjorken scaling single-spin asymmetries and the leading-twist diffractive and shadowing contributions to deep inelastic lepton-proton scattering.
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