Amplitude for N-gluon superstring scattering

Stephan Stieberger, Ludwig–Maximilians–Universität München, Germany
Tomasz R. Taylor, Northeastern University

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Originally posted at http://arxiv.org/abs/hep-th/0607184v3. Preprint of an article published in Physical Review Letters, v.97 no.21, 2006.

Abstract

We consider scattering processes involving N gluonic massless states of open superstrings with certain Regge slope α′. At the semi-classical level, the string world-sheet sweeps a disk and N gluons are created or annihilated at the boundary. We present exact expressions for the corresponding amplitudes, valid to all orders in α′, for the so-called maximally helicity violating configurations, with N=4, 5 and N=6. We also obtain the leading O(α′²) string corrections to the zero-slope N-gluon Yang-Mills amplitudes.