A chiral model of N and Δ with vector mesons

The authors model the nonperturbative QCD problem of the structure of N and Δ as three quarks in color singlet state interacting with mesons. They discuss how such a model will exhibit neither confinement nor asymptotic freedom. Physical phenomena which depend on either of these two features cannot be accounted for with it. However, the model should be capable of describing the properties of low-lying states of N and Δ and N-N forces at distances -- 1 fm and larger. Failure to do so should warrant rejection of the model. A major difference between the present model and the various bag models is discussed. In the latter the confinement mechanism, manifested through the bag, holds the three quarks together and gives it the final size. In the present model the intermediate range interaction mediated by the mesons is responsible for the final size of N and Δ