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The exact form factors of the Heisenberg models $XXX$ and $XXZ$ have beenrecently computed through the quantum affine symmetry of $XXZ$ model in thethermodynamic limit. We use them to derive an exact formula for thecontribution of two spinons to the dynamical correlation function of $XXX$model at zero temperature.Comment: 5 pages, Latex, Presented at the Symposium ``Exactly soluble models  in statistical mechanics: historical perspectives and current status" March  30-31, 1996, Northeastern University, Bosto

From Quantum Affine Groups to the Exact Dynamical Correlation Function of the Heisenberg Model