Abstract
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.
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Mai, M., Meißner, UG. Constraints on the chiral unitary \(\bar KN\) amplitude from πΣK+ photoproduction data. Eur. Phys. J. A 51, 30 (2015). https://doi.org/10.1140/epja/i2015-15030-3
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DOI: https://doi.org/10.1140/epja/i2015-15030-3