https://doi.org/10.1140/epja/i2015-15030-3
Regular Article - Theoretical Physics
Constraints on the chiral unitary 
amplitude from πΣK+ photoproduction data
1
Helmholtz-Institut für Strahlen- und Kernphysik (Theorie) and Bethe Center for Theoretical Physics, Universität Bonn, D-53115, Bonn, Germany
2
Institut für Kernphysik, Institute for Advanced Simulation and Jülich Center for Hadron Physics, Forschungszentrum Jülich, D-52425, Jülich, Germany
* e-mail: mai@hiskp.uni-bonn.de
Received:
11
December
2014
Revised:
5
February
2015
Accepted:
9
February
2015
Published online:
9
March
2015
A chiral unitary approach for antikaon-nucleon scattering in on-shell factorization is studied. We find multiple sets of parameters for which the model describes all existing hadronic data similarly well. We confirm the two-pole structure of the Λ(1405). The narrow Λ(1405) pole appears at comparable positions in the complex energy plane, whereas the location of the broad pole suffers from a large uncertainty. In the second step, we use a simple model for photoproduction of K + πΣ off the proton and confront it with the experimental data from the CLAS Collaboration. It is found that only a few of the hadronic solutions allow for a consistent description of the CLAS data within the assumed reaction mechanism.
© SIF, Springer-Verlag Berlin Heidelberg, 2015
