Precise determination of the parameters of resonances f0\(500\) and f0\(980\) by fitting the data and dispersion relations
نویسندگان
چکیده
The long-standing puzzle in the parameters of the f0(500), as well as the f0(980), is finally being settled [1] thanks to precise dispersive analyses carried out during the last years. Here we report on our very recent dispersive data analysis which allowed for a precise and model independent determination of the amplitudes for the S , P, D and F waves [2–4]. The analytic continuation of once subtracted dispersion relations for the S 0 wave to the complex energy plane leads to very precise results for the f0(500) pole: √ spole = 457+14 −13 − i279+11 −7 MeV and for the f0(980) pole: √ spole = 996 ± 7 − i25+10 −6 MeV.
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