Abstract
Recent results from the Crystal Ball spectrometer show no evidence for two-photon production of the pseudoscalar resonances π(1300), η(1275) or η(1440). We give a simple theoretical argument showing that the two-photon couplings to excited SU(3) pseudoscalars are naturally suppressed by chiral symmetry in QCD. Effects of the spontaneous chiral symmetry breaking nevertheless give a finite contribution to the two-photon coupling, even in the limit of zero quark mass. We construct an effective chiral meson lagrangian that incorporates these qualitative properties, and use it to estimate the two-photon couplings in the chiral limit. The results are well compatible with experiment.
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