One-Loop N-Point Superstring Amplitudes with Manifest d=4 Supersymmetry

TL;DR

This paper employs the hybrid formalism to compute one-loop N-point superstring amplitudes with manifest four-dimensional supersymmetry, providing explicit formulas for supergravity states.

Contribution

It introduces a method to derive one-loop superstring amplitudes with arbitrary external states while maintaining manifest d=4 supersymmetry.

Findings

Explicit Koba-Nielsen-like formulas for amplitudes

Amplitudes include arbitrary external supergravity states

Preserves manifest d=4 supersymmetry

Abstract

The hybrid formalism for the superstring is used to compute one-loop amplitudes with an arbitrary number of external d=4 supergravity states. These one-loop N-point amplitudes are expressed as Koba-Nielsen-like formulas with manifest d=4 supersymmetry.