OpenLoops 2

Abstract We present the new version of OpenLoops , an automated generator of tree and one-loop scattering amplitudes based on the open-loop recursion. One main novelty of OpenLoops 2 is the extension of the original algorithm from NLO QCD to the full Standard Model, including electroweak (EW) corrections from gauge, Higgs and Yukawa interactions. In this context, among several new features, we discuss the systematic bookkeeping of QCD–EW interferences, a flexible implementation of the complex-mass scheme for processes with on-shell and off-shell unstable particles, a special treatment of on-shell and off-shell external photons, and efficient scale variations. The other main novelty is the implementation of the…

• NS
  National Science Foundation
• UO
  University of Sussex
• SN
  Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung

  Awards: 157722, PZ00P2-179877, PZ00P2, 179877, BSCGI0-157722
• SA
  Science and Technology Facilities Council

  Award: ST/P001246/1