Eta-eta' mixing in U(3) chiral perturbation theory

الأصل · EN

We investigate eta-eta' mixing in infrared regularized U(3) chiral perturbation theory by calculating the eta and eta' masses up to one-loop order. From this analysis it becomes obvious that even at leading order eta-eta' mixing does not obey the usually assumed one-mixing angle scheme if large Nc counting rules are not employed.