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We study the resonance properties within chiral perturbation theory byexplicitly taking into account the U_A(1) anomaly effect. This assures we havethe appropriate degrees of freedom of low energy QCD in the large Nc limit. Wecalculate the various resonance properties, such as mass, width and residues,for the physical case, i.e. Nc=3. Then we extrapolate the values of Nc to studythe trajectories of resonance poles.

Exploration of resonance properties in chiral perturbation theory with explicit U_A(1) anomaly