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Hyperon II: Properties of excited hyperons

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Abstract.

We report properties of \( \Lambda\) and \( \Sigma\) hyperon resonances formed in \( K^-\) induced reactions. Special emphasis is laid on the analysis of the three-body final states \( 2\pi^{0}\Lambda\) and \( 2\pi^{0}\Sigma\) and of the quasi-two-body final states \( \pi\Lambda (1520)\), \( \bar{K}\Delta (1232)\), \( \pi\Sigma (1385)\), \( \bar{K}^{\ast}N\), and \( \omega\Lambda\). We give pole positions of \( \Lambda\) and \( \Sigma\) hyperon resonances and transition residues from the \( K^{-}p\) initial to various final states as well as Breit-Wigner masses and widths and decay branching ratios. Twenty resonances and “bumps” reported in the Review of Particle Physics are not required in our fits, evidence for five new resonances is reported. The observed mass spectrum is compared to the spectrum calculated in the Bonn quark model. Three spin doublets, six \( \Lambda\) hyperons, are tentatively assigned to the SU(3) singlet system.

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Authors and Affiliations

  1. Helmholtz-Institut für Strahlen- und Kernphysik, Universität Bonn, 53115, Bonn, Germany

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

  2. National Research Centre “Kurchatov Institute”, Petersburg Nuclear Physics Institute, 188300, Gatchina, Russia

    A. V. Sarantsev, M. Matveev, V. A. Nikonov & A. V. Anisovich

Authors
  1. A. V. Sarantsev
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  2. M. Matveev
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  3. V. A. Nikonov
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  4. A. V. Anisovich
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  5. U. Thoma
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  6. E. Klempt
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Corresponding author

Correspondence to E. Klempt.

Additional information

Communicated by N. Kalantar

Data Availability Statement

This manuscript has associated data in a data repository. [Authors’ comment: Data will be available at https://pwa.hiskp.uni-bonn.de]

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Sarantsev, A.V., Matveev, M., Nikonov, V.A. et al. Hyperon II: Properties of excited hyperons. Eur. Phys. J. A 55, 180 (2019). https://doi.org/10.1140/epja/i2019-12880-5

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  • DOI: https://doi.org/10.1140/epja/i2019-12880-5

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