2019 Impact factor 2.176
Hadrons and Nuclei
Eur. Phys. J. A 7, 255-259

The $\eta'$ and the topological charge density

B. Borasoy

Physik Department, Technische Universität München, 85747 Garching, Germany

Received: 3 November 1999 / Revised version: 10 January 2000 Communicated by F. Lenz

We compare two different frameworks which have been proposed to include the $\eta'$ in chiral perturbation theory. The equivalence of these two approaches is shown both for the purely mesonic case and in the presence of the ground state baryon octet. The relation between the different sets of parameters in both Lagrangians is clarified.

12.39.Fe Chiral Lagrangians

Copyright Società Italiana di Fisica, Springer-Verlag 2000