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We compute the full one-loop 2-particle S-matrix for excitations of the typeIIB AdS(3) x S(3) x T(4) BMN string. The S-matrix is found to respect theexpected symmetries and the phases are consistent with the crossing equations.By analyzing how the relevant integrals scale with the IR regulator we showthat scattering of massless bosons is trivial at two loops. Based on ourresults we argue that the additional su(2) S-matrix appearing in the masslesssector in the exact solution should trivialize.

The complete one-loop BMN S-matrix in AdS(3) x S(3) x T(4)