2005/03/18 by M. Eidemüller, Markus Eidemüller, F. S. Navarra +2 · 2 citations
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1103/physrevd.72.034003
published as Phys.Rev. D72 (2005) 034003 · 20 pages, 6 figures
arxiv created 2005/03/18 · openalex publication_date 2005/08/05 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
In a diquark-diquark-antiquark picture of the pentaquark we study the decay \ensuremathΘ\ensuremath→K+n within the framework of QCD sum rules. After evaluation of the relevant three-point function, we extract the coupling g_\ensuremathΘnK which is directly related to the pentaquark width. Restricting the decay diagrams to those with color exchange between the mesonlike and baryonlike clusters reduces the coupling constant by a factor of 4. Whereas a small decay width might be possible for a positive parity pentaquark, it seems difficult to explain the measured width for a pentaquark with negative parity.