Complete Six-Gluon Disk Amplitude in Superstring Theory

TL;DR

This paper computes all six-gluon NMHV amplitudes in type I superstring theory at disk level, providing a comprehensive, model-independent result that complements previous MHV amplitude calculations.

Contribution

It presents the first complete calculation of six-gluon NMHV amplitudes in superstring theory, extending the understanding of gluon scattering beyond MHV configurations.

Findings

All six-gluon NMHV amplitudes are obtained to all orders in alpha'

Results are model-independent and valid for various compactifications

Completes the set of six-gluon disk amplitudes in superstring theory

Abstract

We evaluate all next-to-maximal helicity violating (NMHV) six-gluon amplitudes in type I open superstring theory in four dimensions, at the disk level, to all orders in alpha'. Although the computation utilizes supersymmetric Ward identities, the result holds for all compactifications, even for those that break supersymmetry and is completely model-independent. Together with the maximally helicity violating (MHV) amplitudes presented in the previous work, our results provide the complete six-gluon disk amplitude.