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

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

1994-11-02

arxiv.org/abs/hep-th/9411015v1

Nucl.Phys. B440 (1995) 441-494

Physics

High Energy Physics

High Energy Physics - Theory

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

Scientific paper

10.1016/0550-3213(95)00053-U

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.

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