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 α′-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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Schwab, B.U.W. Subleading soft factor for string disk amplitudes. J. High Energ. Phys. 2014, 62 (2014). https://doi.org/10.1007/JHEP08(2014)062
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DOI: https://doi.org/10.1007/JHEP08(2014)062