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An investigation of the s-wave channels in meson-meson scattering isperformed within a U(3) chiral unitary approach. Our calculations are based ona chiral effective Lagrangian which includes the eta' as an explicit degree offreedom and incorporates important features of the underlying QCD Lagrangiansuch as the axial U(1) anomaly. We employ a coupled channel Bethe-Salpeterequation to generate poles from composed states of two pseudoscalar mesons. Ourresults are compared with experimental phase shifts up to 1.5 GeV and effectsof the eta' within this scheme are discussed.Comment: 18 pages, 6 figure

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

<i>s</i>-wave meson-meson scattering from unitarized<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>U</mml:mi><mml:mo>(</mml:mo><mml:mn>3</mml:mn><mml:mo>)</mml:mo><mml:mn /></mml:math>chiral Lagrangians

s-wave meson-meson scattering from unitarizedU(3)chiral Lagrangians