Precise dispersive determination of the f0(600) and f0(980) resonances
Jose R. Pelaez, R. Garcia Martin, R. Kaminski, J. Ruiz de Elvira
TL;DR
This paper presents a precise, model-independent dispersive analysis of the f0(600) and f0(980) scalar resonances, determining their poles, widths, and couplings using Roy equations and recent decay data.
Contribution
It provides the first dispersive, model-independent determination of the lightest scalar resonances' parameters with high precision.
Findings
f0(600) pole at (457+14-13)-i(279+11-7) MeV
f0(980) pole at (996+-7)-i(25+10-6) MeV
couplings to two pions: 3.59+0.11-0.13 GeV and 2.3+-0.2 GeV
Abstract
We review our recent dispersive and model independent determination of the lightest two scalars, in terms of poles and residues - or mass, width and coupling- by means of once and twice subtracted Roy equations, using as input constrained fits to data, including the most recent ones from Kl4 decays. We find the f0(600) pole at (457+14-13)-i(279+11-7) MeV and that of the f0(980) at (996+-7)-i(25+10-6) MeV, whereas their respective couplings to two pions are 3.59+0.11-0.13 GeV and 2.3+-0.2 GeV.
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Taxonomy
TopicsQuantum Chromodynamics and Particle Interactions · Particle physics theoretical and experimental studies · High-Energy Particle Collisions Research