Decays of σ , κ , a 0 ( 980 ) and f 0 ( 980 )
نویسنده
چکیده
Ratios of coupling constants for these decays are compared with qq̄ predictions and Jaffe’s qq̄ model. In both models, the predicted ratio g(κ→ Kπ)/g(σ → ππ) is much too small. Also, for qq̄, the predicted ratio g(κ → Kη)/g(κ → Kπ) is much larger than observed. Both models fail for g(f0 →KK)/g (a0 →KK). This ratio requires that f0 has a dominantKK component. It arises naturally because the f0 pole lies very close to the KK threshold, giving its wave function a long KK tail. PACS. 13.25.Gv; 14.40.Gx; 13.40.Hq
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