Primakoff effect in eta-photoproduction off protons

Details Primakoff effect in eta-photoproduction off protons Primakoff effect in eta-photoproduction off protons

2010-01-05

arxiv.org/abs/1001.0646v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, 6 figures, gamma-gamma*-eta form factor included, version to appear in Eur. Phys. J. A.

Scientific paper

We analyse data on forward eta-meson photoproduction off a proton target and extract the eta to 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 to 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.

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