1998/06/23 by Chun Wa Wong · 1 citation
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #nucl-th
paper · pdf · doi:10.1103/physrevc.58.2414
published as Phys.Rev.C58:2414-2428,1998 · 15 pages, RevTeX, two-column journal style, six figures
arxiv created 1998/06/23 · openalex publication_date 1998/10/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Under certain circumstances, a three-body decay width can be approximated by an integral involving a product of two off-shell two-body decay widths. This ``angle-average'' approximation is used to calculate the \ensuremathπNN decay width of the d*(J^\ensuremathπ=3+,T=0) dibaryon in a simple \ensuremathΔ2 model for the most important Feynman diagrams describing pion emissions with baryon-baryon recoil and meson retardation. The decay width is found to be about 0.006 (0.07, 0.5) MeV at the d* mass of 2065 (2100, 2150) MeV for input dynamics derived from the full Bonn potential. The smallness of this width is qualitatively understood as the result of the three-body decay being ``third forbidden.'' The concept of l forbiddenness and the threshold behavior of a three-body decay are further studied in connection with the \ensuremathπNN decay of the dibaryon d^\ensuremath'(J^\ensuremathπ=0^\ensuremath-,T=0or2) where the idea of ``unfavoredness'' has to be introduced. The implications of these results are briefly discussed.