Chiral closed strings: four massless states scattering amplitude

@article{Leite2016ChiralCS,
  title={Chiral closed strings: four massless states scattering amplitude},
  author={Marcelo M. Leite and Warren Siegel},
  journal={Journal of High Energy Physics},
  year={2016},
  volume={2017},
  pages={1-26}
}
A bstractWe compute the scattering amplitudes of four massless states for chiral (closed) bosonic and type II superstrings using the Kawai-Lewellen-Tye (KLT ) factorization method. The amplitude in the chiral bosonic case is identical to a field theory amplitude corresponding to the spin-2 tachyon, massless gravitational sector and massive spin-2 tardyon states of the spectrum. Chiral type II superstrings amplitude only possess poles associated with the massless gravitational sector. We briefly… 
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