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Subleading Soft Factor for String Disk Amplitudes
Published 16 Jun 2014 in hep-th | (1406.4172v2)
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 $\alpha'$-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.
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