Structure of the Light Scalar Mesons from a Coupled Channel Analysis of the S-wave Ππ −kk̄ Scattering
نویسنده
چکیده
The analysis of the poles of the ππ scattering amplitude is shown to favour a dynamical origin of the sigma meson: it is created by a strongly attractive ππ interaction in the J = 0I = 0 channel. In the limit Nc → ∞, the σ meson disappears, contrary to the case of conventional qq̄ states. Implications for the search of the scalar qq̄ and glueball states are discussed.
منابع مشابه
The structure of the light scalar mesons and QCD sum rules
The structure of the light scalar mesons is elucidated by the investigation of the S-matrix poles and the qq̄ spectral density in a coupled channel model that includes ππ, KK̄ and qq̄ channels. It is shown that the dynamical origin of the σ and f0(980) mesons is consistent with the observed spectrum of the scalar states. The KK̄ molecular picture of the f0(980) is in good agreement with recent expe...
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