New Perspectives for QCD: The Novel Effects of Final-State Interactions and Near-Conformal Effective Couplings

Abstract

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.

LaTex, 33 pages. Invited talk presented at the 2nd Conference On Nuclear And Particle Physics With CEBAF At Jlab (NAPP 2003) %26-31 May 2003, %Dubrovnik, Croatia

References in corpus (17)

• The Uses of Conformal Symmetry in QCD
• Non-perturbative Faddeev-Popov formula and infrared limit of QCD
• Perturbative QCD Analysis of the Nucleon's Pauli Form Factor F_2(Q^2)
• Initial-State Interactions in the Unpolarized Drell-Yan Process
• Measurement of Beam-Spin Asymmetries for Deep Inelastic ${\pi }^{+}$ Electroproduction
• Relating a gluon mass scale to an infrared fixed point in pure gauge QCD
• Confinement and gluon propagator in Coulomb gauge QCD
• Hunting for glueballs in electron-positron annihilation
• Scaling laws in hadronic processes and string theory
• Sivers vs. Collins effect in azimuthal single spin asymmetries in pion production in SIDIS
• Single Hadronic-Spin Asymmetries in Weak Interaction Processes
• Generalized Parton Distributions and the Spin Structure of the Nucleon
• Transversity and Meson Photoproduction
• Single-Spin Beam Asymmetry in Semi-Exclusive Deep-Inelastic Electroproduction
• AdS/CFT Correspondence and QCD with Quarks in Fundamental Representations
• Light-Front Quantization of Gauge Theories
• NLO calculations of the exclusive processes in pQCD

Cited by in corpus (1)

• Light-Front Quantization and QCD Phenomena