Large-angle two-photon exclusive channels in quantum chromodynamics

Conference · Fri May 01 04:00:00 EDT 1981

OSTI ID:6332490

Brodsky, S J; Lepage, G P

Detailed leading order QCD predictions are given for the scaling, angular, and helicity dependence of the reactions ..gamma gamma.. ..-->.. M anti M (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/, eta' and eta/sub c/ ..-->.. ..gamma gamma.. are also discussed. The existence of a fixed Regge singularity at J = 0 which couples to ..gamma..rho ..-->.. ..gamma..rho in the t-channel but not ..gamma pi.. ..-->.. ..gamma pi.. is also proved.

• Research Organization: Stanford Linear Accelerator Center, CA (USA); Cornell Univ., Ithaca, NY (USA). Lab. of Nuclear Studies
• DOE Contract Number: AC03-76SF00515
• OSTI ID: 6332490
• Report Number(s): SLAC-PUB-2733; CONF-810496-1; ON: DE81025089
• Country of Publication: United States
• Language: English

Related Subjects

645202* -- High Energy Physics-- Particle Interactions & Properties-Theoretical-- Electromagnetic Interactions & Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANNIHILATION
BASIC INTERACTIONS
BOSONS
CROSS SECTIONS
DATA
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
EXCLUSIVE INTERACTIONS
FIELD THEORIES
FORM FACTORS
HADRONS
HELICITY
INFORMATION
INTERACTIONS
MESONS
MOMENTUM TRANSFER
NUMERICAL DATA
PAIR PRODUCTION
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PARTICLE PROPERTIES
PHOTON-PHOTON INTERACTIONS
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
THEORETICAL DATA