1992/10/23 by Yasuo Umino, Y. Umino, F. Myhrer · 2 citations
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #nucl-th
paper · pdf · doi:10.1016/0375-9474(93)90248-v
published as Nucl.Phys. A554 (1993) 593-619 · 41 pages (LaTex file), SUNYSB-NTG-92-07 (Accepted for publication in Nucl. Phys. A)
arxiv created 1992/10/23 · openalex publication_date 1993/03/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Excited negative parity hyperon masses are calculated in a chiral bag model in which the pion and the kaon fields are treated as perturbations. We also calculate the hadronic widths of \lama and \lamb as well as the coupling constants of the lightest I=0 excited hyperon to the meson-baryon channels, and discuss how the dispersive effects of the hadronic meson-baryon decay channels affect the excited hyperon masses. Meson cloud corrections to the electromagnetic decay widths of the two lightest excited hyperons into ground states \lamz and \sigz are calculated within the same model and are found to be small. Our results strengthen the argument that predictions of these hyperon radiative decay widths provide an excellent test for various quark models of hadrons.