Abstract
We study the two-particle form-factors for the relativistic limit of the integrable S-matrix of the
mixed-flux AdS3 × S
3 × T
4
string theory. The S-matrix theory was formally constructed in two
distinct ways by two different teams. We focus on the massive theory built up by Frolov, Polvara
and Sfondrini, and derive expressions for the minimal solutions to the axioms, in both integral
and manifestly meromorphic form, and then proceed to apply the off-shell Bethe ansatz method of
Babujian et al. We obtain the integral formulas for the two-particle complete form-factors and check
the axioms at this particle number.