Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-10-07
Physics
High Energy Physics
High Energy Physics - Phenomenology
4 pages, 1 figure. To appear in the proceedings of the Meson 2008 conference, June 6-10, Cracow, Poland
Scientific paper
10.1142/S0217751X09044140
We review how the use of recent precise data on kaon decays together with forward dispersion relations (FDR) and Roy's equations allow us to determine the sigma resonance pole position very precisely, by using only experimental input. In addition, we present preliminary results for a modified set of Roy-like equations with only one subtraction, that show a remarkable improvement in the precision around the sigma region. We also improve the matching between the parametrizations at low and intermediate energy of the S0 wave, and show that the effect of this on the sigma pole position is negligible.
Garcia-Martin R.
Kaminski Robert
Pelaez Jose Ramon
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