J. Bernabeu et al., ETA-ETA' PHOTOPRODUCTION AND THE AXIAL ISOSCALAR NEUTRAL-CURRENT COUPLING, Zeitschrift fur Physik. C, Particles and fields, 69(3), 1996, pp. 431-435
We show that coherent eta and eta' photoproduction by means of the Pri
makoff Effect on the proton depends on the strange component of the ne
utral axial current coupling. We construct polarization asymmetries th
at are sensitive to this coupling through the gamma-Z interference. Th
e eta' is not a Goldstone boson of a spontaneously broken chiral symme
try, but a phenomenological analysis of the eta and eta' production th
rough chiral perturbation theory allows to calculate the observables o
f interest. The polarized proton or polarized photon asym-metries are
predicted to be close to 10(-4) for - q(2) similar to 0.1 - 0.5 GeV2.