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Reduction of General Two-Loop Self-Energies to Standard Scalar Integrals
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| Organization: | Institute of Theoretical Physics, University of Leipzig |
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A method is presented for reducing general two-loop self-energies to standard scalar integrals in massive gauge theories with special emphasis on the electroweak Standard Model (SM). We develop a technique for treating the tensor structure of two-loop integrals appearing in self-energy calculation. It is used together with the symmetry properties of the integrals to obtain a result in terms of a small number of standard scalar integrals. The results are valid for arbitrary values of the invariant momentum p2, all particle masses, the space-time dimension D and the gauge parameters Xi=gamma,Z,W). The algebraic structure of the results clearly displays the gauge dependence of the considered quantities and allows us to perform very stringent checks. We explicitly verify Slavnov-Taylor identities by calculating several thousand Feynman diagrams and adding them up algebraically. As an application of our algorithm we calculate the light fermion contributions to the two-loop gauge boson self-energies of the electroweak SM. We study their gauge dependence and discuss the occurring standard integrals.
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