The Use of Dispersion Relations in the ππ and Kbar K Coupled-Channel System
classification
✦ hep-ph
keywords
coupled-channeldispersionrelationssystembranchcarefulcutsderived
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Systematic and careful studies are made on the properties of the IJ=00 $\pi\pi$ and $K\bar K$ coupled-channel system, using newly derived dispersion relations between the phase shifts and poles and cuts. The effects of nearby branch point singularities to the determination of the $f_0(980)$ resonance are estimated and and discussed.
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