2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/142664We show how to match quark models to the 1/Nc expansion of QCD. As an example we discuss in detail the mass operator of orbitally excited baryons and match it to the one-gluon exchange and the one-boson exchange variants of the quark model. The matching procedure is very general and makes use of the transformation properties of states and operators under S_N^{orb} \times S_N^{sp-fl}, the permutation group acting on the orbital and spin-flavor degrees of freedom of N quarks.6 pages, Invited plenary talk at NSTAR2007, Workshop on the Physics of Excited Nucleons, 5 - 8 September 2007, Bonn, GermanyHigh Energy Physics - PhenomenologyHigh Energy Physics - TheoryNuclear Theorytext