Studies on σ Resonance in a New Unitarization Approach
Studies on σ Resonance in a New Unitarization Approach
摘要
The pole position of the σ meson is determined using the recently proposednew unitarization method combined with the two-loop SU(2) X SU(2) chiral perturbation theoryresults. The scattering length parameters and the effective range parameters predicted by our methodare in good agreement with experimental results. It is found that M_σ = 542 ± 26 ± 39 MeV, Γ_σ= 546 ± 122 ± 25 MeV.
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