Precise determination of the sigma pole location from a dispersive analysis
High Energy Physics - Phenomenology
2008-11-26 v1
Abstract
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.
Cite
@article{arxiv.0804.2643,
title = {Precise determination of the sigma pole location from a dispersive analysis},
author = {R. Garcia-Martin and R. Kaminski and J. R. Pelaez},
journal= {arXiv preprint arXiv:0804.2643},
year = {2008}
}
Comments
5 pages, 2 figures. To appear in the proceedings of the Workshop on Scalar Mesons and Related Topics, Lisbon, Portugal, 11-16 Feb 2008