Exclusive photoproduction of large momentum- transfer K and K* mesons (CROSBI ID 77355)
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Podaci o odgovornosti
Kroll, Peter ; Schürmann, M. ; Passek, Kornelija ; Schweiger, Wolfgang
engleski
Exclusive photoproduction of large momentum- transfer K and K* mesons
The reactions gamma p->K+Lambda and gamma p- >K*+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* distribution amplitudes. The asymptotic form of the K distribution amplitude ( proportional x1x2) is found to provide a satisfactory description of the K photoproduction data.
exclusive reactions ; QCD ; diquarks ; photoproduction ; K and K*mesons
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Podaci o izdanju
55 (7)
1997.
4315-4328
objavljeno
0556-2821
1089-4918
10.1103/PhysRevD.55.4315