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Dispersive study of pion-kaon scattering: the kappa and other strange resonances and threshold parameters

Jose Pelaez (Universidad Complutense de Madrid)

21 Gennaio 2021 @ 14:30 - 16:30

We have recently completed the coupled dispersive analysis of  pi pi -> K anti-K We show that just fitting data fails to satisfy the dispersive representation and leads to inconsistencies with threshold sum-rules as well as unreliable resonance parameterizations. Our main result is a set of constrained fits to data that satisfy 16 dispersion relations of different kinds and allow for a reliable extraction of threshold and subtreshold parameters to be compared with Chiral Perturbation Theory and lattice QCD. In addition, we obtain a precise dispersive determination of the controversial light kappa-meson parameters, which has therefore become a “confirmed” state in the PDG, completing the light meson scalar nonet. The constrained fits to data are easy to implement and ready for further theoretical and experimental studies.

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21 Gennaio 2021
14:30 - 16:30
Categoria Evento:
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INFN – Laboratori Nazionali di Frascati
Via Enrico Fermi, 54
Frascati, Roma 00044 Italia
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