Abstract
Measurements of the polarised beam asymmetry parameter Σ for eta photoproduction from protons, have been carried out at incident energies of 2.5 GeV and 3.0 GeV, and for various t-values between −0.2 (GeV/c) 2 and −1.2 (GeV/c) 2. The values of Σ are close to +1 for values of | t| less than 0.7 (GeV/c) 2, showing that there can be little contribution from unnatural parity exchange in any Regge exchange model of the process, in disagreement with present theories. Differential cross sections for the process werre also measured, and are consistent with those from other experiments.
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