2026-06-26T20:19:56Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/448522023-08-28T07:52:55Zcom_20.500.14352_14col_20.500.14352_15

Garcia-Martin, R Kamiński, Robert Peláez Sagredo, José Ramón 2023-06-20T04:03:08Z 2023-06-20T04:03:08Z 2009-01-03 0217-751X 10.1142/S0217751X09044140 https://hdl.handle.net/20.500.14352/44852 http://dx.doi.org/10.1142/S0217751X09044140 http://www.worldscientific.com 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 σ 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. eng open access Precise dispersive data analysis of the f_0(600) pole journal article