2004/09/09 by Tetsuya Shinozaki, Makoto Oka, S. Takeuchi +1
Physics and Astronomy · #Antisymmetric relation #Baryon #High-Energy Particle Collisions Research #Instanton #Mathematical physics #Nuclear physics #Parity (physics) #Particle physics #Particle physics theoretical and experimental studies #Pentaquark #Physics #Quantum Chromodynamics and Particle Interactions #Quark #Quark model #hep-ph
paper · pdf · doi:10.1103/physrevd.71.074025
published as Phys.Rev.D71:074025,2005 · 11 pages, 3 figures
arxiv created 2004/09/09 · openalex publication_date 2005/04/28 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Roles of instanton induced interactions (III) in the masses of pentaquark baryons, \ensuremathΘ+ (J=1/2 and 3/2) and \ensuremathΞ--, and a dibaryon, H, are discussed using the MIT bag model. It is shown that the two-body terms in III give a strong attraction mainly due to the increase of the number of flavor antisymmetric quark pairs in multiquark systems. In contrast, the three-body u-d-s interaction is repulsive. It is found that III lowers the mass of negative-parity \ensuremathΘ+ as much as 100 MeV from the mass predicted by the bag model without III. We also consider possible quark model configurations for positive-parity \ensuremathΘ+ under III.