Large-angle two-photon exclusive channels in quantum chromodynamics

Journal Article · Thu Oct 01 04:00:00 EDT 1981 · Phys. Rev. D; (United States)

DOI:https://doi.org/10.1103/PhysRevD.24.1808· OSTI ID:5933328

Brodsky, S J; Lepage, G P

Detailed leading-order quantum-chromodynamics (QCD) predictions are given for the scaling, angular, and helicity dependence of the reactions ..gamma gamma -->..MM-bar (M = ..pi.., K, rho, etc.) at large momentum transfer. In addition to providing a basic test of QCD at short distances, measurements can be used to determine the process-independent meson distribution amplitudes phi/sub M/(x,Q). Other related two-photon channels such as ..gamma gamma --> gamma..rho, ..gamma..*..gamma --> pi../sup 0/,eta/sup 0/,..nu..', and eta/sub c/..--> gamma gamma.. are also discussed. We also prove the existence of a fixed Regge singularity at J = 0 which couples to ..gamma..rho..--> gamma..rho in the t channel but not to ..gamma pi --> gamma pi...

• Research Organization: Stanford Linear Accelerator Center, Stanford University, Stanford, California 94305
• OSTI ID: 5933328
• Journal Information: Phys. Rev. D; (United States), Journal Name: Phys. Rev. D; (United States) Vol. 24:7; ISSN PRVDA
• Country of Publication: United States
• Language: English

Related Subjects

645202* -- High Energy Physics-- Particle Interactions & Properties-Theoretical-- Electromagnetic Interactions & Properties
645400 -- High Energy Physics-- Field Theory
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
AMPLITUDES
ANGULAR DISTRIBUTION
ANNIHILATION
BASIC INTERACTIONS
BOSONS
DISTRIBUTION
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
EXCLUSIVE INTERACTIONS
FIELD THEORIES
FORM FACTORS
HADRONS
HELICITY
INTERACTIONS
LINEAR MOMENTUM
MESONS
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PARTICLE PROPERTIES
PERTURBATION THEORY
PHOTON-PHOTON INTERACTIONS
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
SCALING LAWS
SCATTERING AMPLITUDES
T CHANNEL
TRANSVERSE MOMENTUM