Primakoff effect in eta-photoproduction off protons

Abstract

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.

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

References in corpus (6)

• Dispersion analysis of the nucleon form factors including meson continua
• Photoproduction of $\eta$ and $\eta \prime$ Mesons off Protons
• Differential cross sections for the reactions gamma p-> p eta and gamma p -> p eta-prime
• Quasi-free photoproduction of eta-mesons of the neutron
• Pion-nucleon charge-exchange amplitudes above 2 GeV
• Neutral pion photoproduction at high energies

Cited by in corpus (4)

• Primakoff production of ${\pi }^0$, $\eta$ and ${\eta }^{\prime }$ in the Coulomb field of a nucleus
• $\eta$ production off the proton in a Regge-plus-chiral quark approach
• Analysis of recent eta photoproduction data
• Photoproductions of $f_1(1285)$ and ${\eta }^{\prime }(958)$ from the analysis of CLAS data with the Primakoff effect at high energies