AdS/QCD, Light-Front Holography, and Sublimated Gluons
The gauge/gravity duality leads to a simple analytical and phenomenologically compelling nonperturbative approximation to the full light-front QCD Hamiltonian - 'Light-Front Holography', which provides a Lorentz-invariant first-approximation to QCD, and successfully describes the spectroscopy of light-quark meson and baryons, their elastic and transition form factors, and other hadronic properties. The bound-state Schroedinger and Dirac equations of the soft-wall AdS/QCD model predict linear Regge trajectories which have the same slope in orbital angular momentum L and radial quantum number n for both mesons and baryons. Light-front holography connects the fifth-dimensional coordinate of AdS space z to an invariant impact separation variable {zeta} in 3+1 space at fixed light-front time. A key feature is the determination of the frame-independent light-front wavefunctions of hadrons - the relativistic analogs of the Schroedinger wavefunctions of atomic physics which allow one to compute form factors, transversity distributions, spin properties of the valence quarks, jet hadronization, and other hadronic observables. One thus obtains a one-parameter color-confining model for hadron physics at the amplitude level. AdS/QCD also predicts the form of the non-perturbative effective coupling {alpha}{sub s}{sup AdS} (Q) and its {beta}-function with an infrared fixed point which agrees with the effective coupling a{sub g1} (Q{sup 2}) extracted from measurements of the Bjorken sum rule below Q{sup 2} < 1 GeV{sup 2}. This is consistent with a flux-tube interpretation of QCD where soft gluons with virtualities Q{sup 2} < 1 GeV{sup 2} are sublimated into a color-confining potential for quarks. We discuss a number of phenomenological hadronic properties which support this picture.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-76SF00515
- OSTI ID:
- 1035079
- Report Number(s):
- SLAC-PUB-14843; arXiv:1112.4212; TRN: US1201084
- Journal Information:
- PoS QCD-TNT-II:008,2011, Conference: InvitedInternational Workshop on QCD Green's Functions, Confinement, and Phenomenology ., ECT* Trento Italy, 9/5/2011-9/9/2011
- Country of Publication:
- United States
- Language:
- English
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71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
74 ATOMIC AND MOLECULAR PHYSICS
AMPLITUDES
APPROXIMATIONS
ATOMIC PHYSICS
BARYONS
BOUND STATE
DIRAC EQUATION
DUALITY
FORM FACTORS
GLUONS
HADRONS
HAMILTONIANS
HOLOGRAPHY
MESONS
ORBITAL ANGULAR MOMENTUM
PHYSICS
QUANTUM CHROMODYNAMICS
QUANTUM NUMBERS
QUARKS
REGGE TRAJECTORIES
SPECTROSCOPY
SUM RULES
VALENCE
Phenomenology-HEP
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