Exclusive Photoproduction of Large Momentum-Transfer K and K* Mesons

Abstract

The reactions gamma p -> K+ Lambda and gamma p -> K* Lambda are analyzed within perturbative QCD, allowing for diquarks as quasi-elementary constituents of baryons. The diquark-model parameters and the quark-diquark distribution amplitudes of 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 to x1 x2) is found to provide a satisfactory description of the K photoproduction data.

arXiv comment32 pages, 7 figures available as tared, compressed and uuencoded PS-files

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Cited by in corpus (5)

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• Electric and magnetic form factors of strange baryons
• Scaling and Resonances in Elementary K^+ Lambda Photoproduction
• Hard exclusive photoproduction of $\Phi$ mesons
• Spin effects in high-energy proton-proton scattering within a diquark model