2005/03/29 by B. C. Liu, B. S. Zou · 4 citations
Physics and Astronomy · #Computer science #Nuclear physics research studies #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #nucl-th
paper · pdf · doi:10.1103/physrevlett.96.042002
published as Phys.Rev.Lett. 96 (2006) 042002 · 9 pages, 4 figures
arxiv created 2005/03/29 · openalex publication_date 2006/01/31 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Using a resonance isobar model and an effective Lagrangian approach, from recent BES results on J/\ensuremathψ\ensuremath→pp\ensuremathη and \ensuremathψ\ensuremath→pK+\ensuremathΛ, we deduce the ratio between effective coupling constants of N*(1535) to K\ensuremathΛ and p\ensuremathη to be R\ensuremath≡g_N*(1535)K\ensuremathΛ/g_N*(1535)p\ensuremathη=1.3\ifmmode±\else\textpm\fi0.3. With the previous known value of g_N*(1535)p\ensuremathη, the obtained new value of g_N*(1535)K\ensuremathΛ is shown to reproduce recent pp\ensuremath→pK+\ensuremathΛ near-threshold cross section data as well. Taking into account this large N*K\ensuremathΛ coupling in the coupled channel Breit-Wigner formula for the N*(1535), its Breit-Wigner mass is found to be around 1400 MeV, much smaller than the previous value of about 1535 MeV obtained without including its coupling to K\ensuremathΛ. The implication on the nature of N*(1535) is discussed.