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This work focuses on the calculation of the large-volume behaviour of formfactors of local operators in the XXZ spin-$1/2$ chain taken between the groundstate and an excited state containing bound states. The analysis is rigorousand builds on various fine properties of the string solutions to the Betheequations and certain technical hypotheses. These technical hypotheses aresatisfied for a generic excited state. The results obtained in this work pavethe way for extracting, starting from the first principles, the large-distanceand long-time asymptotic behaviour of the XXZ chain's two-point functions justas the so-called edge singularities of their Fourier transforms.

Form factors of bound states in the XXZ chain