From maximal to minimal supersymmetry in string loop amplitudes


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… (More)


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