2026/06/30 by Marco Costantino, Silvia Penati, Alessandro Sfondrini
#hep-th
We consider the supersymmetric λ-deformation of AdS3 × S3 × T4 superstrings and compute its perturbative bosonic tree-level worldsheet S matrix in the light-cone gauge. For generic values of 0 ≤ λ< 1, we show that the worldsheet scattering remains compatible with integrability due to a non-trivial cancellation of non-elastic scattering processes. By contrast, the S matrix becomes ill-defined for λ→ 1, despite the fact that this limit reproduces the non-Abelian T-dual geometry up to an analytic continuation. This suggests that the λ→ 1 limit does not capture the full worldsheet dynamics of the T-dual theory.