QCD and Light-Front Dynamics
arXiv:1010.4962
Abstract
AdS/QCD, the correspondence between theories in a dilaton-modified five-dimensional anti-de Sitter space and confining field theories in physical space-time, provides a remarkable semiclassical model for hadron physics. 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. The result is a single-variable light-front Schrodinger equation which determines the eigenspectrum and the light-front wavefunctions of hadrons for general spin and orbital angular momentum. The coordinate z in AdS space is uniquely identified with a Lorentz-invariant coordinate zeta which measures the separation of the constituents within a hadron at equal light-front time and determines the off-shell dynamics of the bound state wavefunctions as a function of the invariant mass of the constituents. The hadron eigenstates generally have components with different orbital angular momentum; e.g., the proton eigenstate in AdS/QCD with massless quarks has L=0 and L=1 light-front Fock components with equal probability. Higher Fock states with extra quark-anti quark pairs also arise. The soft-wall model also predicts the form of the non-perturbative effective coupling and its beta-function. The AdS/QCD model can be systematically improved by using its complete orthonormal solutions to diagonalize the full QCD light-front Hamiltonian or by applying the Lippmann-Schwinger method to systematically include QCD interaction terms. Some novel features of QCD are discussed, including the consequences of confinement for quark and gluon condensates. A method for computing the hadronization of quark and gluon jets at the amplitude level is outlined.
Invited talk presented by SJB at Light Cone 2010: Relativistic Hadronic and Particle Physics, 14-18 June 2010, Valencia, Spain
References in corpus (37)
- Gauge-Invariant Decomposition of Nucleon Spin and Its Spin-Off
- Quantum Chromodynamics and Other Field Theories on the Light Cone
- Hard Scattering and Gauge/String Duality
- Leading-twist Single-transverse-spin asymmetries: Drell-Yan and Deep-Inelastic Scattering
- Chiral symmetry breaking from five dimensional spaces
- Final-State Interactions and Single-Spin Asymmetries in Semi-Inclusive Deep Inelastic Scattering
- pi- and K-meson Bethe-Salpeter Amplitudes
- Hadronic Spectra and Light-Front Wavefunctions in Holographic QCD
- Pion mass and decay constant
- Light-Front Dynamics and AdS/QCD Correspondence: The Pion Form Factor in the Space- and Time-Like Regions
- Deep Inelastic Scattering and Gauge/String Duality
- Universality of soft and collinear factors in hard-scattering factorization
- Light-Front Holography: A First Approximation to QCD
- Initial-State Interactions and Single-Spin Asymmetries in Drell-Yan Processes
- Heavy-Quark Potentials and AdS/QCD
- Determination of the Charged Pion Form Factor at Q2=1.60 and 2.45 (GeV/c)2
- Investigating the origins of transverse spin asymmetries at RHIC
- Inclusive Measurement of Diffractive Deep-inelastic ep Scattering
- Hamiltonian light-front field theory in a basis function approach
- k_T factorization is violated in production of high-transverse-momentum particles in hadron-hadron collisions
- Nonperturbative QCD Coupling and its function from Light-Front Holography
- Light-Front Dynamics and AdS/QCD Correspondence: Gravitational Form Factors of Composite Hadrons
- Initial-State Interactions in the Unpolarized Drell-Yan Process
- Gravitational Form Factors of Vector Mesons in an AdS/QCD Model
- PDF Nuclear Corrections for Charged Lepton and Neutrino Deep Inelastic Scattering Processes
- Maximum Wavelength of Confined Quarks and Gluons and Properties of Quantum Chromodynamics
- Generalized parton distributions in AdS/QCD
- Condensates in Quantum Chromodynamics and the Cosmological Constant
- Heavy quark mass expansion and intrinsic charm in light hadrons
- Light-Front Holography and Gauge/Gravity Duality: The Light Meson and Baryon Spectra
- Exact kinematics in the small x evolution of the color dipole and gluon cascade
- Light-Front Holography and Hadronization at the Amplitude Level
- Light-Front-Quantized QCD in Covariant Gauge
- Dynamic versus Static Hadronic Structure Functions
- On Condensates in Strongly Coupled Gauge Theories
- Reggeon Non-Factorizability and the J=0 Fixed Pole in DVCS
- QCD and Light-Front Holography