%0 Journal Article
%A Kamiński, Robert
%A Garcia-Martin, R.
%A Grynkiewicz, P.
%A Peláez Sagredo, José Ramón
%T Sigma pole position and errors of a once and twice subtracted dispersive analysis of π and π scattering data
%D 2009
%@ 0920-5632
%U https://hdl.handle.net/20.500.14352/44857
%X We show how the new precise data on kaon decays together with forward dispersion relations, sum rules and once- and twice-subtracted Roy’s equations allow for a precise determination of the sigma meson pole position. We present a comparison and a study of the different sources of  uncertainties when using either once- or twicesubtracted Roy’s equations to analyze the data. Finally we present a preliminary determination of the σ pole from the constrained dispersive data analysis.
%~