In this paper we initiate the study of form factors for the massless scattering of integrable AdS2 superstrings, where the difference-form of the S-matrix can be exploited to implement the relativistic form factor bootstrap. The non-standard nature of the S-matrix implies that traditional methods do not apply. We use the fact that the massless AdS2S-matrix is a limit of a better-behaved S-matrix found by Fendley. We show that the previously conjectured massless AdS2 dressing factor coincides with the limit of the De Martino-Moriconi improved dressing factor for the Fendley S-matrix. We then solve the form factor constraints in the two-particle case. Along the way we find a method to construct integral representations of relativistic dressing factors satisfying specific assumptions, and use it to obtain analytic proofs of crossing and unitarity relations.

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We analyse super non-Abelian T-duality for principal chiral models, symmetric space sigma models, and semi-symmetric space sigma models for general Lie supergroups. This includes T-duality along both bosonic and fermionic directions. Specifically, super non-Abelian T-duality exchanges the Maurer-Cartan equations with the equations of motion thus mapping integrable models into integrable models. This, in turn, allows us to construct the T-dual Lax connections. As a prime example, we analyse the OSpp1|2q principal chiral model, and whilst the target superspace of this model is a three-dimensional supergravity background, we argue that its super non-Abelian T-dual falls outside the class of such backgrounds.