2026-06-27T06:05:57Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/534822023-09-07T15:08:36Zcom_20.500.14352_14col_20.500.14352_21

Garcia Martin, R. Kamiński, Robert Peláez Sagredo, José Ramón 2023-06-20T13:43:00Z 2023-06-20T13:43:00Z 2008 978-0-7354-0554-7 10.1063/1.2973510 https://hdl.handle.net/20.500.14352/53482 http://dx.doi.org/10.1063/1.2973510 http://scitation.aip.org 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 eng open access Precise determination of the σ pole location from a dispersive analysis book part