Axial U(1) dynamics in eta and eta' photoproduction

Details Axial U(1) dynamics in eta and eta' photoproduction Axial U(1) dynamics in eta and eta' photoproduction

2000-07-26

arxiv.org/abs/hep-ph/0007293v1

Nucl.Phys. A686 (2001) 429-446

Physics

High Energy Physics

High Energy Physics - Phenomenology

19 pages, 9 figures

Scientific paper

10.1016/S0375-9474(00)00574-1

We discuss the sensitivity of eta and eta' photoproduction near threshold to the gluonic OZI breaking parameters in the U_A(1)-extended effective chiral Lagrangian for low-energy QCD. Our coupled-channels analysis hints at a strong correlation between the gluon-induced contributions to the eta' mass and the low-energy pp -> pp eta' reaction and the near-threshold behaviour of the gamma p -> eta p cross-section.

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