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Published December 2015 | public
Journal Article Open

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


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.

Additional Information

© 2015 Elsevier B.V. Received 20 January 2015; Received in revised form 18 August 2015; Accepted 21 August 2015; Available online 10 September 2015. We want to thank C. Degrande and F. Maltoni for useful discussions on this project and D. Goncalves Netto and K. Mawatari for their constructive bug reports. OM wants to thank the IPPP center for its hospitality during the time of this project. BF was supported in part by the French ANR 12 JS05 002 01 BATS@LHC and by the Theory-LHC-France initiative of the CNRS/IN2P3. CHS is supported by the DOE under grant number DE-SC0010255. DGO is supported by Theoretische Forschungen auf dem Gebiet der Elementarteilchen (SNF). OM is 'Chercheur scientifique logistique postdoctoral F.R.S.-FNRS', Belgium. This work was partly supported by the Research Executive Agency (REA) of the European Union under the Grant Agreement number PITN-GA-2010-264564 (LHCPhenoNet), by MCnetITN FP7 Marie Curie Initial Training Network PITN-GA-2012-315877, by the IISN ''MadGraph'' convention 4.4511.10, by the IISN ''Fundamental interactions'' convention 4.4517.08, and in part by the Belgian Federal Science Policy Office through the Interuniversity Attraction Pole P7/37.

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August 20, 2023
August 20, 2023