A new parametrization for the scalar pion form factors

We derive a new parametrization for the scalar pion form factors that allows us to analyze data over a large energy range via the inclusion of resonances, and at the same time to ensure consistency with the high-accuracy dispersive representations available at low energies. As an application the formalism is used to extract resonance properties of excited scalar mesons from data for B0 s J/ . In particular we find for the pole positions of f 0 (1500) and f 0 (2020) 1465 18i(50 9) MeV and 1910 50i(199 40) MeV, respectively. In addition, from their residues we calculate the respective branching ratios into to be (58 31)% and (1.3 1.8)%.