2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/191593Using a recently proposed solution for an open antiferromagnetic spin-1/2 XXZ quantum spin chain with N (even) spins and two arbitrary boundary parameters at roots of unity, we compute the boundary scattering amplitudes for one-hole states. We also deduce the relations between the lattice boundary parameters appearing in the spin-chain Hamiltonian and the IR (infrared) parameters that appear in the boundary sine-Gordon S matrix.18 pages, LaTeX; references and numerical results addedHigh Energy Physics - Theorytext