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.
CITATION STYLE
Berg, M., Buchberger, I., & Schlotterer, O. (2017). From maximal to minimal supersymmetry in string loop amplitudes. Journal of High Energy Physics, 2017(4). https://doi.org/10.1007/JHEP04(2017)163
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