1998/10/05 by A. Ramos, À. Ramos, E. Oset +2
Physics and Astronomy · #FOS: Physical sciences #High-Energy Particle Collisions Research #Nuclear Theory (nucl-th) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #nucl-th
paper · pdf · doi:10.48550/arxiv.nucl-th/9810014
14 pages, 6 figures, talk presented at "Mesons and Light Nuclei", Pruhonice (Prague), Aug.31-Sep.4 (1998), to appear in the proceedings
arxiv created 1998/10/05 · openalex publication_date 1998/10/05 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The s-wave meson-nucleon interaction in the S=-1 sector is studied by means of a coupled-channel Lippmann Schwinger equation, using the lowest order chiral Lagrangian and a cut off to regularize the loop integrals. The position and width of the Lambda(1405) resonance and the K- p scattering cross sections at low energies are well reproduced. The inclusion of the eta Lambda, eta Sigma0 channels in the coupled system is found very important and allows a solution in terms of only the lowest order Lagrangian. The model is applied to calculate the in-medium K- self-energy to which we add a small p-wave piece resulting from the coupling to hyperon particle-nucleon hole excitations. The K- feels an attraction of about -100 MeV at normal nuclear density. The Lambda(1405) resonance shifts to energies above the K-p threshold and ends up dissolving as density increases. It remains to be seen how these effects persist when the dressing of the Kbar and the pi mesons is incorporated self-consistently in the calculation.