QCD amplitudes with 2 initial spacelike legs via generalised BCFW recursion

Krzysztof Kutak, Andreas van Hameren, Mirko Serino

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


We complete the generalisation of the BCFW recursion relation to the off-shell case, allowing for the computation of tree level scattering amplitudes for full High Energy Factorisation (HEF), i.e. with both incoming partons having a non-vanishing transverse momentum. We provide explicit results for color-ordered amplitudes with two off-shell legs in massless QCD up to 4 point, continuing the program begun in two previous papers. For the 4-fermion amplitudes, which are not BCFW-recursible, we perform a diagrammatic computation, so as to offer a complete set of expressions. We explicitly show and discuss some plots of the squared 2 → 2 matrix elements as functions of the differences in rapidity and azimuthal angle of the final state particles.

Original languageEnglish
Article number9
JournalJournal of High Energy Physics
Issue number2
StatePublished - 1 Feb 2017
Externally publishedYes


  • Gauge Symmetry
  • Perturbative QCD
  • Scattering Amplitudes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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