Eur. Phys. J. A (2013) 49: 158
https://doi.org/10.1140/epja/i2013-13158-8

Regular Article - Experimental Physics

Sign ambiguity in the KΣ channel

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

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

Received: 17 October 2013
Revised: 11 December 2013
Accepted: 15 December 2013
Published online: 24 December 2013

Abstract

Ambiguities of the signs of N → ΣK coupling constants are studied in a multichannel partial wave analysis of a large body of pion- and photo-induced reactions. It is shown that the signs are not free from some ambiguities, and further experimental data are needed. Data on the reactions π ⁺ p → Σ ⁺ K ⁺ and γp → K ⁺ Σ ⁰ define rather well the isospin 3/2 contributions to these channels. However the lack of information on polarization observables for the reactions π ⁻ p → Σ ⁰ K ⁰, π ⁻ p → Σ ⁻ K ⁺ and γp → K ⁰ Σ ⁺ does not allow us to fix uniquely the signs of N → ΣK coupling constants. As a consequence, also the contributions of nucleon resonances to these channels remain uncertain.