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The results of neutron scattering and angle-resolved photoemissionexperiments for the Fe-pnictide parent compounds, and their metallic nature,are shown to impose severe constraints on the range of values that can beconsidered "realistic" for the intraorbital Hubbard repulsion U and Hundcoupling J in multiorbital Hubbard models treated in the mean-fieldapproximation. Phase diagrams for three- and five-orbital models are hereprovided, and the physically realistic regime of couplings is highlighted, toguide future theoretical work into the proper region of parameters of Hubbardmodels. In addition, using the random phase approximation, the pairingtendencies in these realistic coupling regions are investigated. It is shownthat the dominant spin-singlet pairing channels in these coupling regimescorrespond to nodal superconductivity, with strong competition between severalstates that belong to different irreducible representations. This is compatiblewith experimental bulk measurements that have reported the existence of nodesin several Fe-pnictide compounds.

Neutron and ARPES Constraints on the Couplings of the Multiorbital Hubbard Model for the Pnictides