Applications of Light-Front QCD

Abstract

Light-front Fock state wavefunctions encode the bound state properties of hadrons in terms of their quark and gluon degrees of freedom at the amplitude level. The freedom to choose the light-like quantization four-vector provides an explicitly covariant formulation of light-front quantization and can be used to determine the analytic structure of light-front wave functions. The AdS/CFT correspondence of large N_C supergravity theory in higher-dimensional anti-de Sitter space with supersymmetric QCD in 4-dimensional space-time has interesting implications for hadron phenomenology in the conformal limit, including an all-orders demonstration of counting rules for exclusive processes. String/gauge duality also predicts the QCD power-law behavior of light-front Fock-state hadronic wavefunctions with arbitrary orbital angular momentum at high momentum transfer. The form of these near-conformal wavefunctions can be used as an initial ansatz for a variational treatment of the light-front QCD Hamiltonian. I also briefly review recent work which shows that some leading-twist phenomena such as the diffractive component of deep inelastic scattering, single spin asymmetries, nuclear shadowing and antishadowing cannot be computed from the LFWFs of hadrons in isolation.

Presented at QCD DOWN UNDER, 10--13 March 2004 in the Barossa Valley, 15--19 March 2004 at CSSM, Adelaide, Australia

References in corpus (10)

• The Uses of Conformal Symmetry in QCD
• Light-Front Hadron Dynamics and AdS/CFT Correspondence
• Non-perturbative Faddeev-Popov formula and infrared limit of QCD
• On the Behavior of the Effective QCD Coupling alpha_tau(s) at Low Scales
• Counting Rule for Hadronic Light-Cone Wave Functions
• Scaling laws in hadronic processes and string theory
• All-orders infrared freezing of observables in perturbative QCD
• Generalized Parton Distributions and the Spin Structure of the Nucleon
• Light-Front Quantization of Gauge Theories
• Perspectives on Exclusive Processes in QCD