Exclusive photoproduction of large momentum-transfer K and K{sup {asterisk}} mesons
- Fachbereich Physik, Universitaet Wuppertal, D-42097 Wuppertal (Germany)
- Rudjer Boskovic Institute, P.O. Box 1016, HR-10000 Zagreb (Croatia)
- Institut fuer Theoretische Physik, Universitaet Graz, A-8010 Graz (Austria)
The reactions {gamma}p{r_arrow}K{sup +}{Lambda} and {gamma}p{r_arrow}K{sup {asterisk}+}{Lambda} are analyzed within perturbative QCD, allowing for diquarks as quasielementary constituents of baryons. The diquark-model parameters and the quark-diquark distribution amplitudes of the proton and {Lambda} are taken from previous investigations of electromagnetic baryon form factors and Compton scattering off protons. Unpolarized differential cross sections and polarization observables are computed for different choices of the K and K{sup {asterisk}} distribution amplitudes. The asymptotic form of the K distribution amplitude ({proportional_to}x{sub 1}x{sub 2}) is found to provide a satisfactory description of the K photoproduction data. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 477089
- Journal Information:
- Physical Review, D, Journal Name: Physical Review, D Journal Issue: 7 Vol. 55; ISSN PRVDAQ; ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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