Large-angle two-photon exclusive channels in quantum chromodynamics
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; TRN: 81-012723
- Resource Relation:
- Conference: 4. international colloquium on photon-photon interactions, Paris, France, 6 Apr 1981
- Country of Publication:
- United States
- Language:
- English
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FORM FACTORS
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BASIC INTERACTIONS
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645202* - High Energy Physics- Particle Interactions & Properties-Theoretical- Electromagnetic Interactions & Properties