Subleading Soft Factor for String Disk Amplitudes

Abstract

We investigate the behavior of superstring disk scattering amplitudes in the presence of a soft external momentum at finite string tension. We prove that there are no ${\alpha }^{\prime }$-corrections to the field theory form of the subleading soft factor $S^{(1)}$. At the end of this work, we also comment on the possibility to find the corresponding subleading soft factors in closed string theory using our result and the KLT relations.

15 pages, v2: minor changes, new references, version accepted by JHEP

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