https://doi.org/10.1051/epjconf/201920206002
Scalar isoscalar form factors for energies above 1 GeV
1
Helmholtz-Institut für Strahlen-und Kernphysik (Theorie) and Bethe Center for Theoretical Physics, Universität Bonn, 53115 Bonn, Germany
2
Institut für Kernphysik, Institute for Advanced Simulation, and Jülich Center for Hadron Physics, Forschungszentrum Jülich, 52425 Jülich, Germany
* e-mail: ropertz@hiskp.uni-bonn.de
Published online: 13 March 2019
We present a new parametrization for scattering amplitudes and form factors, which is consistent with high-accuracy dispersive representations at low energies but at the same time allows for a data description of higher mass resonances such as the f0(1500) and f0(2020). The formalism is general and thus can be applied to many decay processes. As an example we discuss the decay of 
→ J/ψππ(KK). From the amplitude fixed in a fit to the experimental data pole positions and residues are extracted via Padé approximants.
© The Authors, published by EDP Sciences, 2019
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