https://doi.org/10.1140/epjc/s10052-023-11780-9
Special Article - Tools for Experiment and Theory
UFO 2.0: the ‘Universal Feynman Output’ format
1
Institut de Physique des 2 Infinis de Lyon (IP2I), UMR5822, CNRS/IN2P3, 69622, Villeurbanne Cedex, France
2
Université Catholique de Louvain, Center for Particle Physics and Phenomenology (CP3), Chemin du cyclotron, 2, 1348, Louvain-La-Neuve, Belgium
3
Bethe Center for Theoretical Physics, Universität Bonn, 53115, Bonn, Germany
4
Laboratoire de Physique Théorique et Hautes Energies (LPTHE), UMR 7589, Sorbonne Université et CNRS, 4 place Jussieu, 75252, Paris Cedex 05, France
5
Karlsruhe Institute of Technology, Institute for Theoretical Physics, Wolfgang-Gaede-Str. 1, 76131, Karlsruhe, Germany
6
Institute for Theoretical Physics, University of Bern, Sidlerstrasse 5, 3012, Bern, Switzerland
7
Fermi National Accelerator Laboratory, 60510, Batavia, IL, USA
8
University of Würzburg, Institut für Theoretische Physik und Astrophysik, Emil-Hilb-Weg 22, 97074, Würzburg, Germany
9
INFN, Sezione di Bologna, Via Irnerio 46, 40126, Bologna, Italy
10
Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607, Hamburg, Germany
11
Institute for Particle Physics Phenomenology, Durham University, Durham, UK
12
Institute for Theoretical Physics, Georg-August-University Göttingen, Friedrich-Hund-Platz 1, 37077, Göttingen, Germany
13
Institut für Kern- und Teilchenphysik, TU Dresden, 01069, Dresden, Germany
14
Università degli Studi di Milano and INFN, Sezione di Milano, Via Celoria 16, 20133, Milan, Italy
Received:
2
May
2023
Accepted:
28
June
2023
Published online:
17
July
2023
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.
© The Author(s) 2023
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