Supersymmetry Relations and (N)MHV-Amplitudes in Superstring Theory

by Stephan Stieberger (Munich - Max Planck Inst.)

Tuesday 1 Apr 2008, 14:00 → 15:00 Europe/Zurich

TH Theory Conference Room (CERN)

The subject of this talk is multi-gluon scattering at tree-level in superstring theory. We discuss supersymmetric Ward identities relating various open string scattering amplitudes. We show that at the disk level, the form of such relations remains exactly the same, to all orders in alpha', as in the low-energy effective field theory describing the alpha'-> 0 limit. We apply SUSY relations to the computations of N-gluon MHV superstring amplitudes deriving compact expression for N=5,6,7. Moreover we present all next-to-maximal helicity violating (NMHV) six-gluon amplitudes in type I open superstring theory in four dimensions to all orders in alpha'. Finally we shall discuss implications of these results to jet signals for low mass strings at the LHC.