Reduction of one-loop tensor 5-point integrals

@article{Denner2002ReductionOO,
  title={Reduction of one-loop tensor 5-point integrals},
  author={A. Denner and S. Dittmaier},
  journal={arXiv: High Energy Physics - Phenomenology},
  year={2002}
}
A new method for the reduction of one-loop tensor 5-point integrals to related 4-point integrals is proposed. In contrast to the usual Passarino-Veltman reduction and other methods used in the literature, this reduction avoids the occurrence of inverse Gram determinants, which potentially cause severe numerical instabilities in practical calculations. Explicit results for the 5-point tensor coefficients are presented up to rank 4. The expressions for the reduction of the relevant 1-, 2-, 3… Expand
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