2024/03/27 by J. Haidenbauer, Ulf-G. Meißner, Haidenbauer, J. +1
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Nuclear Theory (nucl-th) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.2403.18706
openalex publication_date 2024/03/27 · openalex created_date 2024/03/29 · openalex updated_date 2026/08/03
Near-threshold pΛ mass spectra for the reactions e+e- → K- pΛ and J/ψ→ K- pΛ are investigated with an emphasis on the role played by the interaction in the pΛ system. As guideline for the pΛ interaction a variety of ΛΛ potential models is considered that have been established in the analysis of data on p p→ ΛΛ in the past. Arguments why the properties of the pΛ and ΛΛ 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 e+e- reaction can be reproduced quantitatively by the assumed pΛ final-state interaction in the partial wave suggested by an amplitude analysis of the experiment. The effect of the pΛ final-state interaction in other decays is explored, including the recently measured reactions B- → J/ψ p Λ and B+ → J/ψ p Λ. It is found that the final-state interaction improves the description of the measured invariant mass near threshold in most cases.