Axial U(1) dynamics in eta and eta' photoproduction
Steven D. Bass, Stefan Wetzel, Wolfram Weise
Abstract
We discuss the sensitivity of eta and eta' photoproduction near threshold to the gluonic OZI breaking parameters in the UA(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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