2005/10/14 by F. S. Navarra, F.S. Navarra, M. Nielsen +1 · 1 citation
Physics and Astronomy · #Coupling (piping) #Coupling constant #Parity (physics) #Particle physics theoretical and experimental studies #Pentaquark #QCD sum rules #Quantum Chromodynamics and Particle Interactions #Quantum and Classical Electrodynamics #Quantum chromodynamics #hep-ph
paper · pdf · doi:10.1016/j.nuclphysbps.2006.08.058
14pages, 5 eps figures. Contribution to the proceedings of LC2005
arxiv created 2005/10/14 · openalex publication_date 2006/11/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
In a diquark-diquark-antiquark picture of the pentaquark we study the decay Θ→ K+ n within the framework of QCD sum rules. After evaluation of the relevant three-point function, we extract the coupling gΘnK which is directly related to the pentaquark width. Restricting the decay diagrams to those with color exchange between the meson-like and baryon-like clusters reduces the coupling constant by a factor of four. 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.