The sigma and f0(980) from Ke4+pi-pi, gamma-gamma scatterings, J/psi, phi to gamma sigmaB and Ds to l nu sigmaB
Abstract
We extract the pole positions, hadronic and gamma-gamma widths of sigma and f0(980, from pi-pi and gamma-gamma scattering data using an improved analytic K-matrix model. Our results favour a large gluon component for the sigma and a ss or/and gluon component for the f0(980) but neither a large four-quark nor a molecule component. Gluonium sigmaB production from J/psi, phi radiative and Ds semi-leptonic decays are also discussed.
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