Details

Autor(en) / Beteiligte

• Badger, Simon
• Brønnum-Hansen, Christian
• Buciuni, Francesco
• O’Connell, Donal

Titel

A unitarity compatible approach to one-loop amplitudes with massive fermions

Ist Teil von

• The journal of high energy physics, 2017-06, Vol.2017 (6), p.1-33, Article 141

Ort / Verlag

Berlin/Heidelberg: Springer Berlin Heidelberg

Erscheinungsjahr

2017

Link zum Volltext

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• A bstract We explain how one-loop amplitudes with massive fermions can be computed using only on-shell information. We first use the spinor-helicity formalism in six dimensions to perform generalised unitarity cuts in d dimensions. We then show that divergent wave-function cuts can be avoided, and the remaining ambiguities in the renormalised amplitudes can be fixed, by matching to universal infrared poles in 4 − 2 ϵ dimensions and ultraviolet poles in 6 − 2 ϵ dimensions. In the latter case we construct an effective Lagrangian in six dimensions and reduce the additional constraint to an on-shell tree-level computation.