2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/228176Axial U(1) dynamics are characterised by large OZI violations. Here we review the phenomenology of eta and eta-prime production and decay processes, and its connection to the anomalous glue that generates a large part of the masses of these pseudoscalar mesons.11 pages, invited talk at the Symposium on Meson Physics, Cracow, Poland, 1-4 October 2008High Energy Physics - Phenomenologytext