Hyperon I: Partial-wave amplitudes for K-p scattering

M. Matveev; A. V. Sarantsev; V. A. Nikonov; A. V. Anisovich; U. Thoma; E. Klempt

doi:10.1140/epja/i2019-12878-y

EPJ

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2024 Impact factor 2.8

Hadrons and Nuclei

Eur. Phys. J. A (2019) 55: 179
https://doi.org/10.1140/epja/i2019-12878-y

Regular Article - Experimental Physics

Hyperon I: Partial-wave amplitudes for K^-p scattering

M. Matveev¹^,2, A. V. Sarantsev¹^,2, V. A. Nikonov¹^,2, A. V. Anisovich¹^,2, U. Thoma¹ and E. Klempt¹^*

¹ Helmholtz-Institut für Strahlen- und Kernphysik, Universität Bonn, 53115, Bonn, Germany
² National Research Centre “Kurchatov Institute”, Petersburg Nuclear Physics Institute, 188300, Gatchina, Russia

^* e-mail: klempt@hiskp.uni-bonn.de

Received: 8 July 2019
Accepted: 9 September 2019
Published online: 17 October 2019

Abstract

Early data on $ K^-$ induced reactions off protons are collected and used in a coupled-channel partial-wave analysis (PWA). Data that had been published in the form of Legendre coefficients are included in the PWA. In a primary fit using $3^{\ast}$ and $4^{\ast}$ resonances only, we observe some significant discrepancies with the data. In a systematic search for new $\Lambda$ and $\Sigma$ hyperon resonances, additional candidates are found. The significance of the known and of the additional resonances is evaluated. Seventeen resonances listed with $1^{\ast}$ or $2^{\ast}$ and one resonance listed with $3^{\ast}$ in the Review of Particle Physics cannot be confirmed, five new hyperons are suggested. The partial-wave amplitudes deduced in this analysis are compared to those from other analyses.