title: Precise determination of the f0(600) and f0(980) pole parameters from a dispersive data analysis.
abstract: We use our latest dispersive analysis of ππ 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.
authors: Departamento de Física Teórica II, Universidad Complutense de Madrid, Spain.
authors: R
authors: R
authors: García-Martín
authors: R
authors: R
authors: Kamiński
authors: J R
authors: JR
authors: Peláez
authors: J Ruiz
authors: JR
authors: de Elvira