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UFO – The Universal FeynRules Output

Celine Degrande
Organization: IPPP Durham University
Claude Duhr
Organization: Institute for Particle Physics Phenomenology, University of Durham
Benjamin Fuks
Organization: Institut Pluridisciplinaire Hubert Curien/Département Recherches Subatomiques, Université de Strasbourg
David Grellscheid
Olivier Marrelaer
Thomas Reiter
Journal / Anthology

Computer Physics Communications
Year: 2012
Volume: 183
Issue: 6
Page range: 1201-1214

We present a new model format for automatized matrix-element generators, the so-called Universal FeynRules Output (UFO). The format is universal in the sense that it features compatibility with more than one single generator and is designed to be flexible, modular and agnostic of any assumption such as the number of particles or the color and Lorentz structures appearing in the interaction vertices. Unlike other model formats where text files need to be parsed, the information on the model is encoded into a Python module that can easily be linked to other computer codes. We then describe an interface for the Mathematica package FeynRules that allows for an automatic output of models in the UFO format.