Decays of σ, κ, a0(980) and f0(980)
Queen Mary, University of London, London, E1 4NS, UK
* e-mail: D.Bugg@rl.ac.uk
Published online: 19 May 2006
Ratios of coupling constants for these decays are compared with qq̄ predictions and Jaffe’s q2q̄2 model. In both models, the predicted ratio g2(κ→Kπ)/g2(σ→ππ) is much too small. Also, for qq̄, the predicted ratio g2(κ→Kη’)/g2(κ→Kπ) is much larger than observed. Both models fail for g2(f0→KK)/g2(a0→KK). This ratio requires that f0 has a dominant KK component. It arises naturally because the f0 pole lies very close to the KK threshold, giving its wave function a long KK tail.
© Springer-Verlag, 2006