Mesonic content of the nucleon and the Roper resonance

Journal Article · Fri Jun 15 00:00:00 EDT 2007 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.75.067001· OSTI ID:21003508

Dillig, M; Schott, M ^[1]

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1. Institute for Theoretical Physics III, University of Erlangen-Nuernberg Staudtstr. 7, Erlangen, D-91058 (Germany)

We investigate colorless (mesonic) 3q-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 {pi},{eta},{rho}, and {omega} content of the nucleon. Applying the same model to the Roper resonance, we find as the most striking result a very strong scalar-isoscalar {sigma}-content of the N*(1440) with a strength of the 3q-qq configurations comparable to the 3q component itself.

• OSTI ID: 21003508
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 75, Issue 6; Other Information: DOI: 10.1103/PhysRevC.75.067001; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
COMPARATIVE EVALUATIONS
EXCITATION
GLUONS
N-1440 BARYONS
NUCLEONS
OMEGA BARYONS
PERIPHERAL MODELS
QUARKS
STRONG-COUPLING MODEL