2024/04/02 by T. Yamaga, S. Ajimura, Yamaga, T. +136
Mathematics · Physics and Astronomy · #FOS: Physical sciences #Nuclear Experiment (nucl-ex) #Nuclear Theory (nucl-th) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #Spectral Theory in Mathematical Physics
paper · pdf · doi:10.48550/arxiv.2404.01773
openalex publication_date 2024/04/02 · openalex created_date 2024/04/05 · openalex updated_date 2026/07/28
We conducted measurements of K- + 3\rm He → π Y N + N' reactions using a 1~\rm GeV/c K--beam, with the objective of understanding the broad decay width of K N N (approximately twice as broad as that of Λ(1405) considered to be the K N quasi-bound state). We successfully reproduced distributions of the π Y N invariant mass and momentum transfer for π Y N using model fitting functions for K N N formation and quasi-free K absorption (\rm QF_K-\rm abs) processes. The model can describe the experimental data quite well, and four K N N → π Y N cross-sections were obtained. The results indicate that mesonic decay is the dominant decay branch of K N N. The results also suggest that ΓπΛN ∼ ΓπΣN, which indicates that the I_K N=1 absorption channel, in addition to the I_K N=0 absorption channel, substantially contribute to the K N N decay, making the K N N state approximately twice as unstable as Λ(1405).