UFO 2.0: the ‘Universal Feynman Output’ format
Luc Darmé (Institut de Physique des 2 Infinis de Lyon (IP2I), UMR5822, CNRS/IN2P3, Villeurbanne Cedex, 69622, France); Céline Degrande (Université Catholique de Louvain, Center for Particle Physics and Phenomenology (CP3), Chemin du cyclotron, 2, Louvain-La-Neuve, 1348, Belgium); Claude Duhr (Bethe Center for Theoretical Physics, Universität Bonn, Bonn, 53115, Germany); Benjamin Fuks (Laboratoire de Physique Théorique et Hautes Energies (LPTHE), UMR 7589, Sorbonne Université et CNRS, 4 place Jussieu, Paris Cedex 05, 75252, France); Mark Goodsell (Laboratoire de Physique Théorique et Hautes Energies (LPTHE), UMR 7589, Sorbonne Université et CNRS, 4 place Jussieu, Paris Cedex 05, 75252, France); et al - Show all 19 authors
We present an update of the Universal FeynRules Output model format, commonly known as the UFO format, that is used by several automated matrix-element generators and high-energy physics software. We detail different features that have been proposed as extensions of the initial format during the last ten years, and collect them in the current second version of the model format that we coin the Universal Feynman Output format. Following the initial philosophy of the UFO, they consist of flexible and modular additions to address particle decays, custom propagators, form factors, the renormalisation group running of parameters and masses, and higher-order quantum corrections.