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Primakoff effect in $ eta$ -photoproduction off protons
Authors:A.?Sibirtsev  J.?Haidenbauer  S.?Krewald  U.?-G.?Mei?ner
Affiliation:1.Helmholtz-Institut für Strahlen- und Kernphysik (Theorie) und Bethe Center for Theoretical Physics,Universit?t Bonn,Bonn,Germany;2.Excited Baryon Analysis Center (EBAC),Thomas Jefferson National Accelerator Facility,Newport News,USA;3.Institut für Kernphysik and Jülich Center for Hadron Physics,Forschungszentrum Jülich,Jülich,Germany;4.Institute for Advanced Simulation,Forschungszentrum Jülich,Jülich,Germany
Abstract:We analyse data on forward h eta -meson photoproduction off a proton target and extract the h eta ? rightarrow g gamma g 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 g gamma p ? rightarrow p h eta data for differential cross-sections and polarizations. We compare our results with present information on the two-photon h 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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