The XXX spin s quantum chain and the alternating s^{1}, s^{2} chain with boundaries
Abstract
The integrable XXX spin s quantum chain and the alternating s^{1}, s^{2} (s^{1}-s^{2}={1\over 2}) chain with boundaries are considered. The scattering of their excitations with the boundaries via the Bethe ansatz method is studied, and the exact boundary S matrices are computed in the limit s, s^{1, 2} \to \infty. Moreover, the connection of these models with the SU(2) Principal Chiral, WZW and the RSOS models is discussed.