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Sigma Content of the Roper Resonance

By M Dillig and M Schott


We investigate colorless (mesonic) components in the nucleon and the Roper resonance N*(1440). Starting from constituent quarks and gluons we estimate the excitation of (q bar q) pairs in a 3P0 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 bar q) configurations comparable to 3q component itself

Topics: Nuclear Physics
Publisher: 'American Physical Society (APS)'
Year: 2004
DOI identifier: 10.1103/PhysRevC.75.067001
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Provided by: CERN Document Server
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