On the computation of one-loop amplitudes with external fermions in 4d heterotic superstrings

Abstract

We present the technical tools needed to compute any one-loop amplitude involving external spacetime fermions in a four-dimensional heterotic string model a` la Kawai-Lewellen-Tye. As an example, we compute the one-loop three-point amplitude with one "photon" and two external massive fermions ("electrons"). As a check of our computation, we verify that the one-loop contribution to the Anomalous Magnetic Moment vanishes if the model has spacetime supersymmetry, as required by the supersymmetric sum rules.

1+59 pages, TeX macros included (AMSFonts required)

References in corpus (1)

• Momentum Analyticity and Finiteness of the 1-Loop Superstring Amplitude

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• On the Compton Scattering in String Theory
• CPT Invariance of String Models in a Minkowski Background
• On the Evaluation of Compton Scattering Amplitudes in String Theory