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The FeynRules projects

  • Implementation and validation of new models
    • B-L: implemetation completed, validation in MC tools ongoing (L. Basso).
    • Dirac gauginos: Dirac gluinos are implemented. The implementation of the full model is ongoing (C. Duhr, P. Fox, B. Fuks, G. Kribbs, A. Martin).
    • MSSM: Validation of the model in Sherpa has started and is ongoing (C. Duhr, B. Fuks, S. Schumann).
    • NMSSM: Implementation of the model is complete. Validation again Whizard will soon start (Herwig++?) (C. Duhr, B. Fuks, J. Reuter).
    • RPV MSSM: Implementation is achieved (C. Duhr, B. Fuks).
    • 5D and 6D UED: Implementation of full model is ongoing (G.Cacciapaglia, J.Llodra-Perez).

  • Validation procedure
    • Any model can be put on the FeynRules website.
    • Each model will be rated regarding the validation performed, from zero to four stars.
    • The platform (Linux version, ...), the Mathematica version, the FeynRules version and the MC generator versions, if relevant, used for the checks must be indicated.
    • Guidelines for validation
      • First star [DOC]
        • The model should be documented (description, references to the Lagrangian and field content, ...).
        • If the model is only a theory fragment, this should be stated.
        • Consistency of the input parameters (external vs. internal, all external plus a spectrum generator,...).
      • Second star [THEO]
        • Basic sanity checks: hermiticity of the Lagrangian, signs in the covariant derivatives, ...
        • If the Feynman rules are available in the literature, comparison (+ references).
        • If any theoretical work is available in the literature, reproduction (handmade or FeynArts/FormCalc or any other symbolic tool).
      • Third star [1MC]
        • Check some basic processes like Drell-Yan or bhabha scattering and that the MC is producing reliable results (running of alpha_s, QED running, ...).
        • Gauge invariance (e.g. several gauges in CalcHep, numerical checks in other MC tools).
        • Reproduce SM results for sectors independent on new physics.
        • Behaviour at high energy (unitarity cancellations).
        • Produce numerical tables for cross sections or any observables for future references.
      • Fourth star [nMC]
        • Show that the [1MC] step can be reproduced by more than one MC generators.
        • Produce some comparison tables for future references.

  • Copyright issues
    • How to give credits to all people involved in the chain Model Building > FeynRules inmplementation > Monte Carlo simulations?
      • Every FeynRules implementation should cite the reference papers of the model.
        • All this information should be encoded in the FeynRules model files via M$Information.
      • Can all this information be passed on through the whole chain down to the MC generators?
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