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arXiv · 1107.1635

Precise determination of the f0(600) and f0(980) pole parameters from a dispersive data analysis

R. Garcia-Martin·R. Kaminski·J. R. Pelaez·J. Ruiz de Elvira
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Abstract

We use our latest dispersive analysis of pion-pion scattering data and the very recent Kl4 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 f0(600) pole at (457^{+14}_{-13})-i(279^{+11}_{-7}) MeV and that of the f0(980) at (996\pm7)-i(25^{+10}_{-6}) MeV, whereas their respective couplings to two pions are 3.59^{+0.11}_{-0.13} GeV and 2.3\pm0.2 GeV.

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R. Garcia-Martin, R. Kaminski, J. R. Pelaez, J. Ruiz de Elvira. 2011-07-08. Precise determination of the f0(600) and f0(980) pole parameters from a dispersive data analysis. https://doi.org/10.1103/physrevlett.107.072001

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