Pi Pi Scattering and Scalar Mesons in an Effective Chiral Lagrangian(§2. ππ/Kπ Scattering,Possible Existence of the σ-Meson and Its Implications to Hadron Physics)

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  • ππ Scattering and Scalar Mesons in an Effective Chiral Lagrangian
  • パイ パイ Scattering and Scalar Mesons in an Effective Chiral Lagrangian

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In this talk I summarize recently proposed mechanisms to understand ππ scattering to 1 GeV in an effective chiral Lagrangian. The Lagrangian includes higher resonances in addition to pions consistently with the chiral symmetry. Iso-spin zero S-wave partial wave amplitude is reproduced up till about 1.2 GeV by including a pion self-interaction and resonant pole exchanges of ρ, f_0(980) and σ derived from the effective chiral Lagrangian. The best fit shows that σ has a mass of around 560 MeV and a width of about 370 MeV.

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