Jose R. Pelaez, R. Garcia Martin, R. Kaminski, J. Ruiz de Elvira
We review our recent dispersive and model independent determination of the lightest two scalars, in terms of poles and residues - or mass, width and coupling- by means of once and twice subtracted Roy equations, using as input constrained fits to data, including the most recent ones from Kl4 decays. We find the f0(600) pole at (457+14-13)-i(279+11-7) MeV and that of the f0(980) at (996+-7)-i(25+10-6) MeV, whereas their respective couplings to two pions are 3.59+0.11-0.13 GeV and 2.3+-0.2 GeV.
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http://arxiv.org/abs/1209.1241
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