Garcia-Martin, RKamiński, RobertPeláez Sagredo, José RamónRuiz De Elvira Carrascal, Jacobo2023-06-202023-06-202011-08-090031-900710.1103/PhysRevLett.107.072001https://hdl.handle.net/20.500.14352/44830©2011 American Physical Society.We use our latest dispersive analysis of π π scattering data and the very recent K_(l4) experimental results to obtain the mass, width, and couplings of the two lightest scalar-isoscalar resonances. These parameters are defined from their associated poles in the complex plane. The analytic continuation to the complex plane is made in a model-independent way by means of once-and twice-subtracted dispersion relations for the partial waves, without any other theoretical assumption. We find the f(0)(600) pole at [457_(-13)^(+14)] – i[279_(-7)^(+11)+ MeV and that of the f(0)(980) at (996 ± 7) – i[25_(-6)^(+10)] MeV, whereas their respective couplings to two pions are 3.59_(-0.13)^(+0.11) and 2.3 ± 0.2 GeV.engjournal articlehttp://dx.doi.org/10.1103/PhysRevLett.107.072001http://journals.aps.orgopen access51-73π-π ScatteringChiral perturbation-theoryMeson dynamicsFinal-statesPhase-shiftGamma-GgmmaSigma-PpleAmplitudesDecaysModelFísica-Modelos matemáticosFísica matemática