Eur. Phys. J. A (2005) 25: 441-453
https://doi.org/10.1140/epja/i2005-10121-4

Original Article

Decays of baryon resonances into ΛK⁺, ΣK⁺ and Σ⁺K⁰

¹ Helmholtz-Institut für Strahlen- und Kernphysik, Universität Bonn, Germany
² Petersburg Nuclear Physics Institute, Gatchina, Russia
³ Physikalisches Institut, Universität Gießen, Germany

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

Received: 13 May 2005
Accepted: 11 July 2005
Published online: 7 October 2005

Abstract

Cross-sections, beam asymmetries, and recoil polarisations for the reactions γp → K ⁺Λ;γp → K ⁺Σ⁰, and γp → K ⁰Σ⁺ have been measured by the SAPHIR, CLAS, and LEPS Collaborations with high statistics and good angular coverage for centre-of-mass energies between 1.6 and 2.3 GeV. The combined analysis of these data with data from π and η photoproduction reveals evidence for new baryon resonances in this energy region. A new P₁₁ state with mass 1840 MeV and width 140 MeV was observed contributing to most of the fitted reactions. The data demand the presence of two D₁₃ states at 1875 and, optimistically, at 2170 MeV.