  We develop an extension of the usual three flavor quark model to four flavors
(u, d, s and c), and discuss the classification of pentaquark states with
hidden charm. We fit our model to the known baryon spectrum and we predict the
double and triple charm baryons, finding good agreement with the most recent
lattice QCD calculations. We compute the the ground state of hidden charm
pentaquarks and their associated magnetic moments and electromagnetic
couplings, of interest to pentaquark photoproduction experiments.

Nuclear Theory;High Energy Physics - Experiment;High Energy Physics - Phenomenology;Nuclear Experiment