THE ROLE OF THE QCD ANOMALY IN KAON PHOTOPRODUCTION

We study the kaon photoproduction associated with the production of the ground state Λ. We investigate the role of K and K* exchange in the t -channel, which can be tested by the photon asymmetry in comparison with experimental data. We find a significant amount of contribution from the one-loop diagram induced by the gauged Wess-Zumino-Witten term for QCD anomaly. This enable us to use coupling constants which are determined in a microscopic way, unlike the previous phenomenological studies where the K* coupling strengths were treated as a free parameter.

RELATIVISTIC DESCRIPTION OF QUASIFREE ETA PHOTOPRODUCTION

A relativistic plane wave formalism for quasifree eta meson photoproduction is presented. The sensitivity of the unpolarized differential cross section, the recoil nucleon polarization, and the photon asymmetry is investigated. The results indicate that the S11 resonance dominates the unpolarized differential cross section, but that its contribution to the spin observables are very small, for which the D13 resonance plays the primary role.