Scalar meson exchange and the baryon spectra

Abstract

We explore the role of a scalar meson exchange interaction between quarks in a semirelativistic constituent quark model where the quarks are subject to a linear confinement. We search for a variational solution and show that the gap between the N=1 band and the ground state N=0 band increases with the strength of the scalar meson exchange interaction potential. This result has good implications on the description of the low-lying baryon resonances, especially on the Roper vs. negative parity resonances ordering.

Comments: 6 pages, RevTex, to appear in the Proceedings of the Third International Conference on "Quark Confinement and the Hadron Spectrum III, Jefferson Lab. (Newport News, USA), June 7-12, 1998, World Scientific (Singapore)