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PHYSICAL REVIEW LETTERS, vol.119, no.11, 2017 (SCI-Expanded)
The supersymmetrization of curvature squared terms is important in the study of the low-energy limit of compactified superstrings where a distinguished role is played by the Gauss-Bonnet combination, which is ghost-free. In this Letter, we construct its off-shell N = (1, 0) supersymmetrization in six dimensions for the first time. By studying this invariant together with the supersymmetric Einstein-Hilbert term, we confirm and extend known results of the alpha'-corrected string theory compactified to six dimensions. Finally, we analyze the spectrum about the AdS(3) x S-3 solution.