Primakoff effect in \( \eta\) -photoproduction off protons
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We analyse data on forward \( \eta\) -meson photoproduction off a proton target and extract the \( \eta\) \( \rightarrow\) \( \gamma\) \( \gamma\) decay width utilizing the Primakoff effect. The hadronic amplitude that enters into our analysis is strongly constrained because it is fixed from a global fit to available \( \gamma\) p \( \rightarrow\) p \( \eta\) data for differential cross-sections and polarizations. We compare our results with present information on the two-photon \( \eta\) -decay from the literature. We provide predictions for future PrimEx experiments at Jefferson Laboratory in order to motivate further studies.
KeywordsForm Factor Photon Energy Decay Width Proton Target Shade Band
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