== Higgs effective Lagrangian ==

=== Authors ===

Adam Alloul
   * Groupe de Recherche en Physique des Hautes Energies - Universite de Haute Alsace
   * adam.alloul@iphc.cnrs.fr
Benjamin Fuks
   * CERN / Institut Pluridisciplinaire Hubert Curien / Universite de Strasbourg
   * benjamin.fuks@iphc.cnrs.fr
Veronica Sanz
   * University of Sussex
   * v.sanz@sussex.ac.uk
=== Description of the model & references ===
The model we have implemented is based on the description given [http://arxiv.org/abs/1310.5150 here] and on the parametrization adopted [http://arxiv.org/abs/arXiv:1303.3876 here]. The Lagrangian consists of an extension of the SM Lagrangian with terms of dimension up to six comprising
   * the set of CP-conserving operators describing the strongly interacting Higgs Lagrangian declared as LSILH in the model file;
   * the set of operators describing the interactions of a pair of Higgs fields with a pair of leptons or quarks declared as LF1 in the model file;
   * the set of operators describing the interactions of a single Higgs field with a pair of leptons or quarks and a gauge boson declared as LF2 in the model file;
   * the set of operators affecting the gauge sector and possibly modifying the gauge boson self-energies and self-interactions. The variable corresponding to this piece of the Lagrangian is LBosons;
   * the set of CP-violating operators declared in the variable LCP.

=== Model file, Lagrangian and vertices ===
   * Main !FeynRules file for the full HEL model: [/attachment/wiki/HEL/HEL.fr HEL.fr]. 
   * Example of a Mathematica® notebook loading the model and the parameters: [/attachment/wiki/HEL/HEL.nb HEL.nb]. 
   * Full Lagrangian as calculated by !FeynRules [/attachment/wiki/HEL/lagrangian.dat Lagrangian]
   * List of all vertices as calculated by !FeynRules [/attachment/wiki/HEL/vertices.dat Vertices]
   * UFO model file generated by !FeynRules with all the new parameters set to 0.1 [/attachment/wiki/HEL/HEL_UFO.tar.gz ufo]
   * !CalcHep model file generated by !FeynRules with all the new parameters set to 0.1 [/attachment/wiki/HEL/HELv7-CH.tgz CalcHep]
      '''WARNING'''   !MaxExpressionLength is longer than the CalcHEP gui can handle. This can be fixed by opening the file c_source/chep_crt/include/syst.h and  change '#define STRSIZ 2048' to '#define STRSIZ 65959' and recompile CH (make clean and then make). »
=== Validation ===