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arXiv · 2001.08153

Determination of the lightest strange resonance $K_0^*(700)$ or $\kappa$, from a dispersive data analysis

J. R. Peláez·A. Rodas
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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 $\pi K\rightarrow\pi K$ and $\pi\pi\rightarrow K\bar K$ 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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J. R. Peláez, A. Rodas. 2020-01-22. Determination of the lightest strange resonance $K_0^*(700)$ or $\kappa$, from a dispersive data analysis. https://doi.org/10.1103/physrevlett.124.172001

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