Light-Front Holography and Novel Effects in QCD
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.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-76SF00515
- OSTI ID:
- 944551
- Report Number(s):
- SLAC-PUB-13491; arXiv:0812.3192; TRN: US0900589
- Resource Relation:
- Conference: Invited talk presented atXIII Mexican School of Particles and Fields, , 10/2/2008-10/11/2008
- Country of Publication:
- United States
- Language:
- English
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71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AMPLITUDES
CONDENSATES
CONFINEMENT
DIMENSIONS
EDUCATIONAL FACILITIES
FIELD THEORIES
FORM FACTORS
GLUONS
HADRONS
HOLOGRAPHY
ORBITAL ANGULAR MOMENTUM
PROBABILITY
QUANTUM CHROMODYNAMICS
QUARKS
RESCATTERING
SCHROEDINGER EQUATION
SPACE-TIME
SPIN
STRUCTURE FUNCTIONS
Phenomenology-HEP
HEPPH
HEPTH