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Zero temperature properties of an (axial-) vector meson extended linear sigmamodel are discussed, concerning on the possible different realizations of theaxial anomaly term. The different anomaly terms are compared with each other onthe basis of a chi^2 minimalization process. It is found that there is noessential difference among the different realizations. This means that any ofthem can be equally used from phenomenological point of view.

Meson vacuum phenomenology in a three-flavor linear sigma model with (axial-)vector mesons: investigation of the U(1)_A anomaly term