Yu. S. Surovtsev, P. Bydvzovsky, R. Kaminski, V. E. Lyubovitskij, M. Nagy
A combined analyses data on isoscalar S-wave processes $\pi\pi\to\pi\pi,K\bar{K},\eta\eta$ and on decays $J/\psi\to\phi\pi\pi,\phi K\bar{K}$ from the DM2, Mark3 and BES collaborations is performed for studying $f_0$-mesons. The method of analysis is based on analyticity and unitarity and uses an uniformization procedure. In analysis only of the multi-channel $\pi\pi$-scattering, two possibilities were found for parameters of the $f_0(600)$ with mass about 700 MeV and with total width about 600 and 930 MeV. The use of only DM2 and Mark3 data on the $J/\psi$ decays does not permit to choose any of these possibilities. However the di-pion mass distribution in the decay $J/\psi\to\phi\pi^+\pi^-$ from BES prefers clearly the wider $f_0(600)$. Some spectroscopic implications from results of the analysis are discussed.
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http://arxiv.org/abs/1207.6937
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