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Computing decay rates for new physics theories with FeynRules and MadGraph 5_aMC@NLO

Johan Alwall
Claude Duhr
Organization: Institute for Particle Physics Phenomenology, University of Durham
Benjamin Fuks
Organization: Institut Pluridisciplinaire Hubert Curien/Département Recherches Subatomiques, Université de Strasbourg
Olivier Mattelaer
Deniz Gizem Öztürk
Chia-Hsien Shen
Journal / Anthology

Computer Physics Communications
Year: 2015
Volume: 197
Page range: 312-323

We present new features of the FeynRules and MadGraph 5_aMC@NLO programs for the automatic computation of decay widths that consistently include channels of arbitrary final-state multiplicity. The implementations are generic enough so that they can be used in the framework of any quantum field theory, possibly including higher-dimensional operators. We extend at the same time the conventions of the Universal FeynRules Output (or UFO) format to include decay tables and information on the total widths. We finally provide a set of representative examples of the usage of the new functions of the different codes in the framework of the Standard Model, the Higgs Effective Field Theory, the Strongly Interacting Light Higgs model and the Minimal Supersymmetric Standard Model and compare the results to available literature and programs for validation purposes.

*Science > Physics