Maximal R-symmetry violating amplitudes in type IIB superstring theory

TL;DR

This paper uses on-shell superspace techniques to identify and analyze a simple class of maximally R-symmetry violating amplitudes in type IIB superstring theory, revealing their properties and contributions to effective field theory.

Contribution

It introduces a new class of non-vanishing R-symmetry violating amplitudes and explores their properties and implications for string theory effective actions.

Findings

Existence of a simple class of maximally R-symmetry violating amplitudes

Determination of the first three non-trivial effective field theory contributions

A conjecture for the exact analytic form of the initial contributions

Abstract

On-shell superspace techniques are used to quantify R-symmetry violation in type IIB superstring theory amplitudes in a flat background in ten dimensions. This shows the existence of a particularly simple class of non-vanishing amplitudes in this theory which violate R-symmetry maximally. General properties of the class and some of its extensions are established which at string tree level are shown to determine the first three non-trivial effective field theory contributions to all multiplicity. This leads to a natural conjecture for the exact analytic part of the first two of these.