2004/09/30 by Chiangbing Li, E. Oset · 1 citation
Physics and Astronomy · #Baryon #Energy (signal processing) #High-Energy Particle Collisions Research #Isospin #Lambda #Meson #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Resonance (particle physics) #nucl-th
paper · pdf · doi:10.1103/physrevc.70.065202
published in Physical Review C 70(6) (American Institute of Physics) · 17 pages, 5 figures, version accepted for publication in Phys. Rev. C
arxiv created 2004/09/30 · openalex publication_date 2004/12/13 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We study the structure of the baryon resonances \ensuremathΛ(1405) and \ensuremathΛ(1405) in J∕\ensuremathψ four-body decays J∕\ensuremathψ\ensuremath→\ensuremathΣ\ensuremathΣ\ensuremathπ\ensuremathπ in the framework of a coupled channel chiral unitary approach. With still sufficient freedom for model parameters, the \ensuremathΛ(1405) and \ensuremathΛ(1405) resonances are generated by simultaneously taking the meson baryon and meson antibaryon final state interactions into account. The \ensuremathπ\ensuremathΣ\phantom\rule0.3em0ex(\ensuremathπ\ensuremathΣ) invariant mass distributions peak around 1410 MeV, which favors the assertion that the \ensuremathΛ(1405)\phantom\rule0.3em0ex[\ensuremathΛ(1405)] is a superposition of the two \ensuremathΛ(1405)\phantom\rule0.3em0ex[\ensuremathΛ(1405)] states which dominantly couple to KN\phantom\rule0.3em0ex(KN) and \ensuremathπ\ensuremathΣ\phantom\rule0.3em0ex(\ensuremathπ\ensuremathΣ), respectively. We also calculate the amplitude for isospin I=1 which gives hints of a possible I=1 baryon resonance in the energy region of the \ensuremathΛ(1405), which up to now has not been observed.