Precise determination of the sigma pole location from a dispersive analysis

Details Precise determination of the sigma pole location from a dispersive analysis Precise determination of the sigma pole location from a dispersive analysis

2008-04-16

arxiv.org/abs/0804.2643v1

AIPConf.Proc.1030:263-267,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, 2 figures. To appear in the proceedings of the Workshop on Scalar Mesons and Related Topics, Lisbon, Portugal, 11-16

Scientific paper

10.1063/1.2973510

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 resonance region. For practical applications, these results are shown to be very well approximated by a very simple conformal expansion.

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