Direct Calculation of Breather S Matrices
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We formulate a systematic Bethe-Ansatz approach for computing bound-state (``breather'') S matrices for integrable quantum spin chains. We use this approach to calculate the breather boundary S matrix for the open XXZ spin chain with diagonal boundary fields. We also compute the soliton boundary S matrix in the critical regime.
23 pages, LaTeX, 1 eps figure
23 pages, LaTeX, 1 eps figure