https://doi.org/10.1140/epja/s10050-024-01345-z
Regular Article –Theoretical Physics
final-state interaction in the reactions 
and 
1
Institute for Advanced Simulation (IAS-4), Forschungszentrum Jülich, D-52428, Jülich, Germany
2
Helmholtz-Institut für Strahlen- und Kernphysik and Bethe Center for Theoretical Physics, Universität Bonn, 53115, Bonn, Germany
Received:
4
April
2024
Accepted:
17
May
2024
Published online:
31
May
2024
Near-threshold 
mass spectra for the reactions 
and 
are investigated with an emphasis on the role played by the interaction in the system. As guideline for the interaction a variety of 
potential models is considered that have been established in the analysis of data on 
in the past. Arguments why the properties of the and interactions can be expected to be very similar are provided. It is shown that the near-threshold enhancement in the invariant mass observed for the 
reaction can be reproduced quantitatively by the assumed final-state interaction in the partial wave suggested by an amplitude analysis of the experiment. The effect of the final-state interaction in other decays is explored, including the recently measured reactions 
and 
. It is found that the final-state interaction improves the description of the measured invariant mass near threshold in most cases.
© The Author(s) 2024
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