Yang-Mills Action from Open Superstring Field Theory

@article{Berkovits2003YangMillsAF,
  title={Yang-Mills Action from Open Superstring Field Theory},
  author={Nathan Berkovits and Martin Schnabl},
  journal={Journal of High Energy Physics},
  year={2003},
  volume={2003},
  pages={022-022}
}
We calculate the effective action for nonabelian gauge bosons up to quartic order using WZW-like open superstring field theory. After including level zero and level one contributions, we obtain with 75% accuracy the Yang-Mills quartic term. We then prove that the complete effective action reproduces the exact Yang-Mills quartic term by analytically performing a summation over the intermediate massive states. 

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