Mesonic Content of the Nucleon and the Roper Resonance

Details Mesonic Content of the Nucleon and the Roper Resonance Mesonic Content of the Nucleon and the Roper Resonance

2004-05-21

arxiv.org/abs/nucl-th/0405063v2

Phys.Rev.C75:067001,2007; Erratum-ibid.C76:019903,2007

Physics

Nuclear Physics

Nuclear Theory

9 pages, 3 figures, 1 table; modified text, new figures

Scientific paper

10.1103/PhysRevC.75.067001

We investigate colorless (mesonic) 3q-q qbar components in the nucleon and the Roper resonance N*(1440). Starting from constituent quarks and gluons we estimate the excitation of quark-antiquark pairs in a gluon exchange model with the strong coupling constant extracted from a comparison with a non-perturbative 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-q qbar configurations comparable to the 3q component itself.

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