Phenomenological evidence for the energy dependence of the $η-η'$ mixing angle

R. Escribano, J. M. Frere

Published 1999-01-25, updated 1999-06-04Version 2

A phenomenological analysis on various decay processes is performed using an energy-dependent $\eta-\eta'$ mixing angle scheme. Special attention is given to the radiative couplings between lowest-lying vector and pseudoscalar mesons. The agreement between our predictions and the experimental values is remarkable. This analysis opens a connection to two-angle fits in the $\eta-\eta'$ sector.