|
| |
FIZIKA B 13 (2004) 1, 91 - 114
 
NEW PERSPECTIVES FOR QCD: NEAR-CONFORMAL QCD
AND THE NOVEL EFFECTS OF FINAL-STATE INTERACTIONS
STANLEY J. BRODSKY
Stanford Linear Accelerator Center, Stanford University, Stanford,
California 94309, USA
E-mail address: sjbth@slac.stanford.edu
Received 23 October 2003; Accepted 26 April 2004
Online 16 July 2004
The effective QCD charge extracted from t decay is
remarkably constant at small momenta, implying the near-conformal behavior of hadronic
interactions at small momentum transfer. The correspondence of large NC
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. 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 are also discussed.
PACS numbers: 12.38.Aw, 13.66.-a, 11.55.-q, 04.65.-e
UDC 539.12.1
Keywords: hadronic interactions, deep inelastic lepton-proton scattering, supergravity
theory, gauge theory, QCD, single-spin asymmetries
|
