2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/39742Gluonic degrees of freedom induce a contact term in the effective chiral Lagrangian description of the low-energy pp -> pp eta' reaction. The strength of this contact term is, in part, related to the amount of spin carried by polarised gluons in a polarised proton.2 pages, LaTeX, talk at DIS 2000, Liverpool, April 2000High Energy Physics - Phenomenologytext