Reconciling φ radiative decays with other data for a0(980), f0(980), ππ→KK and ππ→ηη
Queen Mary, University of London, London, E14NS, UK
* e-mail: D.Bugg@rl.ac.uk
Published online: 19 May 2006
Data for φ→γ(ηπ0) are analysed using the KK loop model and compared with parameters of a0(980) derived from Crystal Barrel data. The ηπ mass spectrum agrees closely and the absolute normalisation lies just within errors. However, BES parameters for f0(980) predict a normalisation for φ→γ(π0π0) at least a factor 2 lower than is observed. This discrepancy may be eliminated by including constructive interference between f0(980) and σ. The magnitude required for σ→KK is consistent with data on ππ→KK. A dispersion relation analysis by Büttiker, Descotes-Genon and Moussallam of ππ→KK leads to a similar conclusion. Data on ππ→ηη also require decays of σ to ηη. Four sets of ππ→KK data all require a small but definite f0(1370) signal.
© Springer-Verlag, 2006