Dresden 2000 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 14: Postersitzung / Theorie

HK 14.30: Poster

Donnerstag, 23. März 2000, 10:15–12:45, B 113

Gluons and the η′–nucleon coupling constant — •Steven Bass — Physik Department, Technische Universität München,
D-85747 Garching, Germany

We derive the effective chiral Lagrangian for low-energy η–nucleon and η′–nucleon interactions and show that gluonic degrees of freedom, via the axial U_A(1) anomaly, induce a contact term in the pp → pp η and pp → pp η′ reactions. The strength of this contact term is, in part, related to the amount of spin carried by polarised gluons in a polarised proton. Finally, we discuss the consequences for the extraction of g_{η′ NN} from experimental data.