Light-Front Holography and Novel Effects in QCD

Journal Article · Mon Apr 20 04:00:00 EDT 2009 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3131569· OSTI ID:21300481

Brodsky, Stanley J ^[1]; Teramond, Guy F. de ^[2]

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1. SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94309 (United States)
2. Universidad de Costa Rica, San Jose (Costa Rica)

The correspondence between theories in anti-de Sitter space and conformal field theories in physical space-time leads to an analytic, semiclassical model for strongly-coupled QCD. Light-front holography allows hadronic amplitudes in the AdS fifth dimension to be mapped to frame-independent light-front wavefunctions of hadrons in physical space-time, thus providing a relativistic description of hadrons at the amplitude level. We identify the AdS coordinate z with an invariant light-front coordinate {zeta} which separates the dynamics of quark and gluon binding from the kinematics of constituent spin and internal orbital angular momentum. The result is a single-variable light-front Schroedinger equation for QCD which determines the eigenspectrum and the light-front wavefunctions of hadrons for general spin and orbital angular momentum. The mapping of electromagnetic and gravitational form factors in AdS space to their corresponding expressions in light-front theory confirms this correspondence. Some novel features of QCD are discussed, including the consequences of confinement for quark and gluon condensates and the behavior of the QCD coupling in the infrared. The distinction between static structure functions such as the probability distributions computed from the square of the light-front wavefunctions versus dynamical structure functions which include the effects of rescattering is emphasized. A new method for computing the hadronization of quark and gluon jets at the amplitude level, an event amplitude generator, is outlined.

• OSTI ID: 21300481
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1116; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANTI DE SITTER SPACE
COMPTON EFFECT
CONFORMAL INVARIANCE
COUPLING
FORM FACTORS
GLUON CONDENSATION
GLUONS
HADRONS
HOLOGRAPHY
JET MODEL
ORBITAL ANGULAR MOMENTUM
QUANTUM CHROMODYNAMICS
QUARKS
SCHROEDINGER EQUATION
SEMICLASSICAL APPROXIMATION
SPACE-TIME
SPIN
STRUCTURE FUNCTIONS
WAVE FUNCTIONS