Publication: Determination of the lightest strange resonance K-0*(700) or kappa, from a dispersive data analysis
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2020-04-30
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American Physical Society
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Abstract
In this work we present a precise and model-independent dispersive determination from data of the existence and parameters of the lightest strange resonance kappa/K-0*(700). We use both subtracted and unsubtracted partial-wave hyperbolic and fixed-t dispersion relations as constraints on combined fits to pi K -> pi K and pi pi -> K (K) over bar data. We then use the hyperbolic equations for the analytic continuation of the isospin I = 1/2 scalar partial wave to the complex plane, in order to determine the kappa/K-0*(700) and K* (892) associated pole parameters and residues.
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© 2020 American Physical Society.
This project has received funding from the MINECO Spanish Grant No. FPA2016-75654-C2-2-P and the European Union's Horizon 2020 research and innovation programme under Grant Agreement No. 824093 (STRONG2020). A. R. would like to acknowledge the financial support of the U.S. Department of Energy Contract No. DE-SC0018416 and of the Universidad Complutense de Madrid.