2003/10/01 by D. E. Kahana, S. H. Kahana, S. Kahana
Physics and Astronomy · #Atomic and Subatomic Physics Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1103/physrevd.69.117502
published as Phys.Rev. D69 (2004) 117502 · 4 pages
arxiv created 2003/10/01 · openalex publication_date 2004/06/18 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Several recent experiments have reported evidence for a narrow feature in the K+-neutron system, an apparent resonant state \ensuremath∼100MeV above threshold and with a width <~25MeV. This state has been labeled as \ensuremathΘ+ (previously as Z*), and because of the implied inclusion of a strange antiquark is referred to as a pentaquark, that is, five quarks within a single bag. We present an alternative explanation for such a structure, as a higher angular momentum resonance in the isospin zero K+N system. One might call this an exit channel or molecular resonance. In a nonrelativistic potential model we find a possible candidate for the kaon-nucleon system with a relative angular momentum L=3, while L=1 states possess centripetal barriers much too low to confine the kaon and nucleon at an energy so high above threshold. Under some circumstances, however, an L=2 state can exist.