= 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 represented 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. , 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.