Sigma pole position and errors of a once and twice subtracted dispersive analysis of pi-pi scattering data
High Energy Physics - Phenomenology
2009-04-30 v2
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 twice-subtracted Roy's equations to analyze the data. Finally we present a preliminary determination of the sigma pole from the constrained dispersive data analysis.
Keywords
Cite
@article{arxiv.0811.4510,
title = {Sigma pole position and errors of a once and twice subtracted dispersive analysis of pi-pi scattering data},
author = {R. Kaminski and R. Garcia-Martin and P. Grynkiewicz and J. R. Pelaez},
journal= {arXiv preprint arXiv:0811.4510},
year = {2009}
}
Comments
4 pages, 6 figures. Contribution to the proceedings of the QCD08 14th International QCD Conference. 7-12th July 2008 Montpellier (France); one reference removed, changed errors in Eqs (4), (5) and (7)