Abstract
The standard unitarity-cut method is applied to several massive two-dimensional models, including the world-sheet AdS\(_5 \times S^5\) superstring, to compute \(2\rightarrow 2\) scattering S-matrices at one loop from tree level amplitudes. Evidence is found for the cut-constructibility of supersymmetric models, while for models without supersymmetry (but integrable) the missing rational terms can be interpreted as a shift in the coupling.
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