Abstract
The spin-orbit interaction coming from the scalar meson-exchange potential between quarks is included in a quark cluster model for the nucleon-nucleon interaction. Its influence on the triplet [ital P]-wave scattering phase shifts and on the baryon spectrum is analyzed. We require that the deuteron binding energy is simultaneously reproduced. Our results indicate that a considerable part of the nucleon-nucleon spin-orbit force can be explained by gluon and sigma exchange between quarks while improving the description of the excited baryon spectrum.
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