Multi-leg calculations with the GRACE/1-LOOP system. --Toward Radiative Corrections to e+e- -> mu nu-bar u d-bar --
arXiv:hep-ph/0407079 · doi:10.1016/j.nuclphysbps.2004.09.016
Abstract
We performed the calculation of the full O(alpha) corrections to e+e- -> mu- nu-bar u d-bar with the help of the GRACE/1-LOOP system. We discuss how a finite decay width introduces a serious gauge invariance breaking, particularly for infrared 5-point functions. This is related to the way the reduction of those functions is performed and to the treatment of the width in the reduction.
5 pages,invited talk at "Loops & Legs in Quantum Field Theory 2004", Zinnowitz, Germany, April 2004