出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We report on our recent progress describing experimental pp data, including the newest precise
data on kaon decays, together with forward dispersion relations (FDR) and Roy’s equations in
order to determine the f0(600) – or sigma – resonance pole position precisely. In particular,
we present a new dispersive method and advance some preliminary results to obtain a precise
description of the sigma pole from data. In particular, we propose, in addition to standard Roy
equations, the use of a set of Roy-like equations but with one subtraction only, that, given the
same experimental input, show a remarkable improvement in the precision in the 400 to 1100
MeV region that is relevant for the determination of the s parameters.
