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Working Group 2 - Interface development
- I. Python interface.
- Description: development of a FeynRules Python interface, which will be used by MG and Herwig
- Names: Claude, David, Olivier, Will.
- Status:
- We decided that a model is a Python package, where particles, parameters, etc. are rperesented as objects. The package will be self-contained in the sense that it provides everything required for the module (definition of the classes, etc.)
- For the moment particles and parameters are written automatically from FR.
- We created a "dummy model", based on the Fr implementation of the Hidden Abelian Higgs model of FR, where we added a vertex u,u,Z' by hand.
- To-do:
- Some tuning for the parameters needs to be done, especially "Waterfall structure".
- Some python files need to be added to the package, e.g. given, functions like sqrt, sin, etc.
- We have now the option to matrices as matrices, rather than component by component. This needs to be discussed and developped further.
- The parts dealing with the vertices, couplings, etc. need to be written. Will is working on splitting the FR vertices into triplets according to color, lorentz_structure and coupling. After this is done, Claude will create the writing routines for vertices.
- David is developing the Herwig part of the Python interface.
- II. Helas.
- Description: automatized generation of Helas routines from FeynRules.
- Names: Olivier, Claude, Will, Priscila, David
- Status:
- We have a defined format for the FR input
- We have produce our first generated automaticaly Helas Routine from FeynRules.
- Testing those routines is in progress
- To-do:
- Python Optimization (code quite slow at the time)
- Regenerate all the Helas routine and test those against the old one
- Implement the Scalar in the FortranWriter
- Implement Helas Optimization
- Implement a mode for complex couplings/masses
- III. FeynArts interface.
- Description: inclusion of the higher dimensional operators in FeynArts.
- Names: Celine, Thomas
- Status:
- Format of the FR output for the dirac indices is defined (Implementation in FR in progress).
- addition of the dirac indices in FeynArts/FormCalc in progress.
- Test in progress : EQCD done (FA only), composite top (FR files used in FA), BFSM (comparison with stock version started).
- To-do:
- Define format for the levi-civita tensor and implement it.
- generate declaration file for FormCalc.
- Merging of the vertices in FR.
- Test SILH + renormalizable theories.
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