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
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.
© SIF, Springer-Verlag Berlin Heidelberg, 2013