English

Chinese Magic in Loop Integrals

High Energy Physics - Phenomenology 2015-05-27 v8

Abstract

We present an approach to higher point loop integrals using Chinese magic in the virtual loop integration variable. We show, using the five point function in the important e^+e^-\to f\bar{f}+\gamma process for ISR as a pedagogical vehicle, that we get an expression for it directly reduced to one scalar 5-point function and 4-, 3-, and 2- point integrals, thereby avoiding the computation of the usual three tensor 5-pt Passarino-Veltman reduction. We argue that this offers potential for greater numerical stability.

Keywords

Cite

@article{arxiv.1101.5981,
  title  = {Chinese Magic in Loop Integrals},
  author = {B. F. L. Ward},
  journal= {arXiv preprint arXiv:1101.5981},
  year   = {2015}
}

Comments

11 pages, 1 figure; improved figure, improved text and references;added CERN report number;extended text; corrected misprint; extended text, improved figure; improved text, fonts and style; extended text for publication in Phys. Rev. D (title changed in journal)

R2 v1 2026-06-21T17:19:23.401Z