2004/05/31 by M. Dillig, M. Schott
Mathematics · Physics and Astronomy · #Content (measure theory) #High-Energy Particle Collisions Research #Mathematical analysis #Mathematics #Nuclear physics #Nucleon #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Resonance (particle physics) #nucl-th
paper · pdf · doi:10.1103/physrevc.75.067001
published as Phys.Rev.C75:067001,2007; Erratum-ibid.C76:019903,2007 · 9 pages, 3 figures, 1 table; modified text, new figures
arxiv created 2006/04/24 · openalex publication_date 2007/06/26 · arxiv updated 2014/11/18 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We investigate colorless (mesonic) 3q\text\ensuremath-qq components in the nucleon and the Roper resonance N*(1440). Starting from constituent quarks and gluons we estimate the excitation of qq pairs in a gluon exchange model with the strong coupling constant extracted from a comparison with a nonperturbative resonating group calculation of the \ensuremathπ,\ensuremathη,\ensuremathρ, and \ensuremathω content of the nucleon. Applying the same model to the Roper resonance, we find as the most striking result a very strong scalar-isoscalar \ensuremathσ-content of the N*(1440) with a strength of the 3q\text\ensuremath-qq configurations comparable to the 3q component itself.