# Fermion scattering amplitudes from gauge-invariant actions for open superstring field theory

@article{Kunitomo2016FermionSA, title={Fermion scattering amplitudes from gauge-invariant actions for open superstring field theory}, author={Hiroshi Kunitomo and Yuji Okawa and Hiroki Sukeno and Tomoyuki Takezaki}, journal={arXiv: High Energy Physics - Theory}, year={2016} }

We calculate on-shell scattering amplitudes involving fermions at the tree level in open superstring field theory. We confirm that four-point and five-point amplitudes in the world-sheet path integral with the standard prescription using picture-changing operators are reproduced. For the four-point amplitudes, we find that the quartic interaction required by gauge invariance adjusts the different assignment of picture-changing operators in the $s$-channel and in the $t$-channel of Feynman…

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