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We use an exact {\it holon} and {\it spinon} Landau-liquid functional whichdescribes the holon - spinon interactions at all scattering orders, to studycorrelation functions of integrable multicomponent many-particle problemsshowing both linear and non-linear energy bands. Motivated by recentphotoemission experiments, we consider specific cases when the dominantnon-linear band terms are quadratic and apply our results to the evaluation ofthe half-filling 1D Hubbard model one-particle spectral functions beyondconformal-field theory.Comment: 10 pages, accepted for publication in Physical Review Letter

One-Particle Spectral Properties of 1D Mott-Hubbard Insulators