- Published 2016

We calculate one-loop string amplitudes of open and closed strings with N = 1, 2, 4 supersymmetry in four and six dimensions, by compactification on Calabi-Yau and K3 orbifolds. In particular, we develop a method to combine contributions from all spin structures for arbitrary number of legs at minimal supersymmetry. Each amplitude is cast into a compact form by reorganizing the kinematic building blocks and casting the worldsheet integrals in a basis. Infrared regularization plays an important role to exhibit the expected factorization limits. We comment on implications for the one-loop string effective action. 1 ar X iv :1 60 3. 05 26 2v 1 [ he pth ] 1 6 M ar 2 01 6

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@inproceedings{Berg2016FromMT,
title={From maximal to minimal supersymmetry in string loop amplitudes},
author={Marcus Berg and Igor Buchberger and Oliver Schlotterer},
year={2016}
}