Publication: Sigma pole position and errors of a once and twice subtracted dispersive analysis of π and π scattering data
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2009-01
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Elsevier Science Bv
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Abstract
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.
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©Elsevier Science Bv.
This talk is dedicated to the memory of F.J. Yndurain. Partial financial support from Spanish contracts PR27/05-13955-BSCH, FPA2004- 02602, UCM-CAM 910309 and BFM2003-00856.
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