%0 Book Section
%T Precise determination of the σ pole location from a dispersive analysis
publisher Amer Inst Physics
%D 2008
%U 978-0-7354-0554-7
%@ https://hdl.handle.net/20.500.14352/53482
%X 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 σ 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 showaremarkable improvement in the precision around the σ region. For practical applications, these results are shown to be very well approximated by a very simple conformal expansion
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