Supersymmetry relations and MHV amplitudes in superstring theory

We discuss supersymmetric Ward identities relating various scattering amplitudes in type I open superstring theory. We show that at the disk level, the form of such relations remains exactly the same, to all orders in α′, as in the low-energy effective field theory describing the α′→0 limit. This result holds in D=4 for all compactificati...更多