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arXiv · 1510.07065

Coupled-Channel Model for $\bar{K}N$ Scattering in the Resonant Region

C. Fernandez-Ramirez·I. V. Danilkin·D. M. Manley·V. Mathieu·A. P. Szczepaniak
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Abstract

We present a unitary multichannel model for $\bar{K}N$ scattering in the resonance region that fulfills unitarity. It has the correct analytical properties for the amplitudes once they are extended to the complex-$s$ plane and the partial waves have the right threshold behavior. To determine the parameters of the model, we have fitted single-energy partial waves up to $J=7/2$ and up to 2.15 GeV of energy in the center-of-mass reference frame obtaining the poles of the $Λ^*$ and $Σ^*$ resonances, which are compared to previous analyses. We provide the most comprehensive picture of the $S=-1$ hyperon spectrum to date. Important differences are found between the available analyses making the gathering of further experimental information on $\bar{K}N$ scattering mandatory to make progress in the assessment of the hyperon spectrum.

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C. Fernandez-Ramirez, I. V. Danilkin, D. M. Manley, V. Mathieu, A. P. Szczepaniak. 2016-02-22. Coupled-Channel Model for $\bar{K}N$ Scattering in the Resonant Region. https://doi.org/10.1103/physrevd.93.034029

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