Speaker: Pablo Rabán Mondéjar, Universidad Complutense de Madrid (UCM)
Title: Model-independent extraction of ππ and πN resonances from forward dispersion relations
Abstract: A precise description of low-energy ππ and πN interactions is essential for many problems in hadronic physics. For the ππ system, we present new global fits that satisfy dispersive constraints within uncertainties up to 1.6 GeV, while describing all available experimental data up to 1.8 GeV. Using continued-fraction expansions, we extract resonance pole parameters in a model-independent way from forward dispersion relations.
For πN scattering, following a careful revision of the database, we determine resonance parameters from forward dispersion relations using exclusively total cross-section data together with the optical theorem.